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  • MAX222CPN图
  • 深圳市宏世佳电子科技有限公司

     该会员已使用本站13年以上
  • MAX222CPN 现货库存
  • 数量3500 
  • 厂家MAXIN 
  • 封装DIP 
  • 批号2023+ 
  • 全新原厂原装产品、公司现货销售
  • QQ:2881894392QQ:2881894392 复制
    QQ:2881894393QQ:2881894393 复制
  • 0755-82556029 QQ:2881894392QQ:2881894393
  • MAX222CPN图
  • 深圳市芯脉实业有限公司

     该会员已使用本站11年以上
  • MAX222CPN 现货库存
  • 数量26980 
  • 厂家MAXIM 
  • 封装DIP-18 
  • 批号21+ 
  • 新到现货、一手货源、当天发货、bom配单
  • QQ:1435424310QQ:1435424310 复制
  • 0755-84507451 QQ:1435424310
  • MAX222CPN图
  • 深圳市芯脉实业有限公司

     该会员已使用本站11年以上
  • MAX222CPN 现货库存
  • 数量69850 
  • 厂家MAXIM 
  • 封装DIP-18 
  • 批号新批次 
  • 新到现货、一手货源、当天发货、bom配单
  • QQ:2881512844QQ:2881512844 复制
  • 075584507705 QQ:2881512844
  • MAX222CPN图
  • 深圳市芯福林电子有限公司

     该会员已使用本站15年以上
  • MAX222CPN
  • 数量85000 
  • 厂家MAXIM/美信 
  • 封装DIP18 
  • 批号23+ 
  • 真实库存全新原装正品!代理此型号
  • QQ:2881495753QQ:2881495753 复制
  • 0755-23605827 QQ:2881495753
  • MAX222CPN图
  • 深圳市芯福林电子有限公司

     该会员已使用本站15年以上
  • MAX222CPN
  • 数量36000 
  • 厂家560 
  • 封装能供更多数量 
  • 批号23+ 
  • 真实库存全新原装正品!代理此型号
  • QQ:2881495751QQ:2881495751 复制
  • 0755-88917743 QQ:2881495751
  • MAX222CPN图
  • 深圳市恒益昌科技有限公司

     该会员已使用本站6年以上
  • MAX222CPN
  • 数量3200 
  • 厂家MAX 
  • 封装QFP 
  • 批号23+ 
  • 全新原装正品现货
  • QQ:3336148967QQ:3336148967 复制
    QQ:974337758QQ:974337758 复制
  • 0755-82723761 QQ:3336148967QQ:974337758
  • MAX222CPN图
  • 深圳市恒达亿科技有限公司

     该会员已使用本站12年以上
  • MAX222CPN
  • 数量3000 
  • 厂家MAXIN 
  • 封装DIP18 
  • 批号23+ 
  • 全新原装公司现货库存!
  • QQ:867789136QQ:867789136 复制
    QQ:1245773710QQ:1245773710 复制
  • 0755-82772189 QQ:867789136QQ:1245773710
  • MAX222CPN图
  • 深圳市能元时代电子有限公司

     该会员已使用本站10年以上
  • MAX222CPN
  • 数量23000 
  • 厂家MAXIM 
  • 封装DIP18 
  • 批号24+ 
  • 原装现货假一赔十,可含长期供货!
  • QQ:2885637848QQ:2885637848 复制
    QQ:2885658492QQ:2885658492 复制
  • 0755-84502810 QQ:2885637848QQ:2885658492
  • MAX222CPN图
  • 深圳市昌和盛利电子有限公司

     该会员已使用本站11年以上
  • MAX222CPN
  • 数量19658 
  • 厂家MAXI【原装正品专卖★特价中】 
  • 封装DIP 
  • 批号▊ NEW ▊ 
  • ◆★█【专注原装正品现货】★价格最低★!量大可定!欢迎惠顾!(长期高价回收全新原装正品电子元器件)
  • QQ:1551106297QQ:1551106297 复制
    QQ:3059638860QQ:3059638860 复制
  • 0755-23125986 QQ:1551106297QQ:3059638860
  • MAX222CPN图
  • 深圳市富莱微科技有限公司

     该会员已使用本站6年以上
  • MAX222CPN
  • 数量7744 
  • 厂家Maxim Integrated 
  • 封装18-DIP 
  • 批号20+ 
  • 进口原装,公司现货
  • QQ:1968343307QQ:1968343307 复制
    QQ:2885835292QQ:2885835292 复制
  • 0755-83210149 QQ:1968343307QQ:2885835292
  • MAX222CPN+图
  • 深圳市高捷芯城科技有限公司

     该会员已使用本站11年以上
  • MAX222CPN+
  • 数量7807 
  • 厂家ADI(亚德诺)/MAXIM(美信) 
  • 封装PDIP-18 
  • 批号23+ 
  • 支持大陆交货,美金交易。原装现货库存。
  • QQ:3007977934QQ:3007977934 复制
    QQ:3007947087QQ:3007947087 复制
  • 0755-83062789 QQ:3007977934QQ:3007947087
  • MAX222CPN图
  • 深圳市晶美隆科技有限公司

     该会员已使用本站15年以上
  • MAX222CPN
  • 数量65800 
  • 厂家MAXIM/美信 
  • 封装DIP-18 
  • 批号24+ 
  • 假一罚十,原装进口正品现货供应,价格优势。
  • QQ:198857245QQ:198857245 复制
  • 0755-82865294 QQ:198857245
  • MAX222CPN图
  • 北京耐芯威科技有限公司

     该会员已使用本站12年以上
  • MAX222CPN
  • 数量3500 
  • 厂家MAXIM 
  • 封装DIP 
  • 批号21+ 
  • 原装正品,公司现货
  • QQ:2880824479QQ:2880824479 复制
    QQ:1344056792QQ:1344056792 复制
  • 010-62104931 QQ:2880824479QQ:1344056792
  • MAX222CPN图
  • 深圳市得捷芯城科技有限公司

     该会员已使用本站11年以上
  • MAX222CPN
  • 数量40 
  • 厂家MAXIM/美信 
  • 封装NA/ 
  • 批号23+ 
  • 优势代理渠道,原装正品,可全系列订货开增值税票
  • QQ:3007977934QQ:3007977934 复制
    QQ:3007947087QQ:3007947087 复制
  • 0755-82546830 QQ:3007977934QQ:3007947087
  • MAX222CPN+图
  • 集好芯城

     该会员已使用本站13年以上
  • MAX222CPN+
  • 数量12915 
  • 厂家MAXIM/美信 
  • 封装DIP 
  • 批号最新批次 
  • 原装原厂 现货现卖
  • QQ:3008092965QQ:3008092965 复制
    QQ:3008092965QQ:3008092965 复制
  • 0755-83239307 QQ:3008092965QQ:3008092965
  • MAX222CPN图
  • 绿盛电子(香港)有限公司

     该会员已使用本站12年以上
  • MAX222CPN
  • 数量2015 
  • 厂家MAXIM 
  • 封装SOP/DIP 
  • 批号19889 
  • ★一级代理原装现货,特价热卖!
  • QQ:2752732883QQ:2752732883 复制
    QQ:240616963QQ:240616963 复制
  • 0755-25165869 QQ:2752732883QQ:240616963
  • MAX222CPN图
  • 深圳市恒达亿科技有限公司

     该会员已使用本站16年以上
  • MAX222CPN
  • 数量4500 
  • 厂家MAXIM 
  • 封装DIP 
  • 批号23+ 
  • 全新原装现货特价销售!
  • QQ:867789136QQ:867789136 复制
    QQ:1245773710QQ:1245773710 复制
  • 0755-82723761 QQ:867789136QQ:1245773710
  • MAX222CPN图
  • 深圳市华斯顿电子科技有限公司

     该会员已使用本站16年以上
  • MAX222CPN
  • 数量43273 
  • 厂家主营MAX 
  • 封装DIP18 
  • 批号2023+ 
  • 绝对原装全新正品现货/优势渠道商、原盘原包原盒
  • QQ:364510898QQ:364510898 复制
    QQ:515102657QQ:515102657 复制
  • 0755-83777708“进口原装正品专供” QQ:364510898QQ:515102657
  • MAX222CPN图
  • 深圳市赛尔通科技有限公司

     该会员已使用本站12年以上
  • MAX222CPN
  • 数量8460 
  • 厂家MAXIM 
  • 封装SOP 
  • 批号NEW 
  • 【优势库存】专业代理全新现货热卖
  • QQ:1134344845QQ:1134344845 复制
    QQ:847984313QQ:847984313 复制
  • 86-0755-83536093 QQ:1134344845QQ:847984313
  • MAX222CPN图
  • 深圳市硅诺电子科技有限公司

     该会员已使用本站8年以上
  • MAX222CPN
  • 数量16529 
  • 厂家MAX 
  • 封装DIP 
  • 批号17+ 
  • 原厂指定分销商,有意请来电或QQ洽谈
  • QQ:1091796029QQ:1091796029 复制
    QQ:916896414QQ:916896414 复制
  • 0755-82772151 QQ:1091796029QQ:916896414
  • MAX222CPN图
  • 深圳市欧立现代科技有限公司

     该会员已使用本站12年以上
  • MAX222CPN
  • 数量6709 
  • 厂家MAXIM 
  • 封装DIP18 
  • 批号24+ 
  • 全新原装现货,欢迎询购!
  • QQ:1950791264QQ:1950791264 复制
    QQ:221698708QQ:221698708 复制
  • 0755-83222787 QQ:1950791264QQ:221698708
  • MAX222CPN图
  • 深圳市欧立现代科技有限公司

     该会员已使用本站12年以上
  • MAX222CPN
  • 数量2000 
  • 厂家MAX 
  • 封装DIP18 
  • 批号24+ 
  • ★★专业IC现货,诚信经营,市场最优价★★
  • QQ:1950791264QQ:1950791264 复制
    QQ:2216987084QQ:2216987084 复制
  • 0755-83222787 QQ:1950791264QQ:2216987084
  • MAX222CPN图
  • 深圳市欧瑞芯科技有限公司

     该会员已使用本站11年以上
  • MAX222CPN
  • 数量9500 
  • 厂家Maxim(美信) 
  • 封装18-DIP(0.300,7.62mm) 
  • 批号24+ 
  • 绝对原装正品,可开专票,欢迎采购!!!
  • QQ:3354557638QQ:3354557638 复制
    QQ:3354557638QQ:3354557638 复制
  • 18565729389 QQ:3354557638QQ:3354557638
  • MAX222CPN+图
  • 万三科技(深圳)有限公司

     该会员已使用本站2年以上
  • MAX222CPN+
  • 数量660000 
  • 厂家Maxim Integrated 
  • 封装18-DIP (0.300 
  • 批号7.62mm) 
  • QQ:3008961398QQ:3008961398 复制
  • 0755-21006672 QQ:3008961398
  • MAX222CPN图
  • 深圳市晶美隆科技有限公司

     该会员已使用本站14年以上
  • MAX222CPN
  • 数量19759 
  • 厂家MAXIM 
  • 封装DIP-18 
  • 批号23+ 
  • 全新原装正品现货热卖
  • QQ:2885348339QQ:2885348339 复制
    QQ:2885348317QQ:2885348317 复制
  • 0755-82519391 QQ:2885348339QQ:2885348317
  • MAX222CPN图
  • 深圳市宏捷佳电子科技有限公司

     该会员已使用本站12年以上
  • MAX222CPN
  • 数量12300 
  • 厂家MAXIM/美信 
  • 封装DIP-18 
  • 批号24+ 
  • ★原装真实库存★13点税!
  • QQ:2353549508QQ:2353549508 复制
    QQ:2885134615QQ:2885134615 复制
  • 0755-83201583 QQ:2353549508QQ:2885134615
  • MAX222CPN图
  • 深圳市宏世佳电子科技有限公司

     该会员已使用本站13年以上
  • MAX222CPN
  • 数量3720 
  • 厂家ADI/MAXIM 
  • 封装18-DIP(0.300,7.62mm) 
  • 批号2023+ 
  • 全新原厂原装产品、公司现货销售
  • QQ:2881894392QQ:2881894392 复制
    QQ:2881894393QQ:2881894393 复制
  • 0755-82556029 QQ:2881894392QQ:2881894393
  • MAX222CPN图
  • 深圳市宏世佳电子科技有限公司

     该会员已使用本站13年以上
  • MAX222CPN
  • 数量3720 
  • 厂家ADI/MAXIM 
  • 封装18-DIP(0.300,7.62mm) 
  • 批号2023+ 
  • 全新原厂原装产品、公司现货销售
  • QQ:2881894392QQ:2881894392 复制
    QQ:2881894393QQ:2881894393 复制
  • 0755-82556029 QQ:2881894392QQ:2881894393
  • MAX222CPN图
  • 深圳市卓越微芯电子有限公司

     该会员已使用本站12年以上
  • MAX222CPN
  • 数量5300 
  • 厂家MAXIM 
  • 封装DIP 
  • 批号20+ 
  • 百分百原装正品 真实公司现货库存 本公司只做原装 可开13%增值税发票,支持样品,欢迎来电咨询!
  • QQ:1437347957QQ:1437347957 复制
    QQ:1205045963QQ:1205045963 复制
  • 0755-82343089 QQ:1437347957QQ:1205045963
  • MAX222CPN图
  • 深圳市正信鑫科技有限公司

     该会员已使用本站12年以上
  • MAX222CPN
  • 数量6406 
  • 厂家Maxim 
  • 封装原厂封装 
  • 批号22+ 
  • 原装正品★真实库存★价格优势★欢迎来电洽谈
  • QQ:1686616797QQ:1686616797 复制
    QQ:2440138151QQ:2440138151 复制
  • 0755-22655674 QQ:1686616797QQ:2440138151
  • MAX222CPN图
  • 深圳市西昂特科技有限公司

     该会员已使用本站13年以上
  • MAX222CPN
  • 数量2017 
  • 厂家MAXIM 
  • 封装DIP-18 
  • 批号08+/09+ 
  • 全新原装现货特价
  • QQ:2881291855QQ:2881291855 复制
    QQ:1158574719QQ:1158574719 复制
  • 0755-82524647 QQ:2881291855QQ:1158574719
  • MAX222CPN图
  • 深圳市华芯盛世科技有限公司

     该会员已使用本站13年以上
  • MAX222CPN
  • 数量865000 
  • 厂家MAXIM/美信 
  • 封装DIP18 
  • 批号最新批号 
  • 一级代理,原装特价现货!
  • QQ:2881475757QQ:2881475757 复制
  • 0755-83225692 QQ:2881475757
  • MAX222CPN+图
  • 深圳市恒意法科技有限公司

     该会员已使用本站17年以上
  • MAX222CPN+
  • 数量9000 
  • 厂家Analog Devices Inc./Maxim Integrated 
  • 封装18-DIP(0.300,7.62mm) 
  • 批号21+ 
  • 正规渠道/品质保证/原装正品现货
  • QQ:2881514372QQ:2881514372 复制
  • 0755-83247729 QQ:2881514372
  • MAX222CPN图
  • 深圳市富科达科技有限公司

     该会员已使用本站13年以上
  • MAX222CPN
  • 数量6050 
  • 厂家MAXIM 
  • 封装DIP-18 
  • 批号2020+ 
  • 全新原装进口现货特价热卖,长期供货
  • QQ:1327510916QQ:1327510916 复制
    QQ:1220223788QQ:1220223788 复制
  • 0755-28767101 QQ:1327510916QQ:1220223788
  • MAX222CPN+图
  • 深圳市惊羽科技有限公司

     该会员已使用本站11年以上
  • MAX222CPN+
  • 数量6328 
  • 厂家MAXIM-美信 
  • 封装DIP-18 
  • 批号▉▉:2年内 
  • ▉▉¥32.6元一有问必回一有长期订货一备货HK仓库
  • QQ:43871025QQ:43871025 复制
  • 131-4700-5145---Q-微-恭-候---有-问-秒-回 QQ:43871025
  • MAX222CPN图
  • 深圳市毅创腾电子科技有限公司

     该会员已使用本站16年以上
  • MAX222CPN
  • 数量1200 
  • 厂家MAXIM 
  • 封装DIP-18 
  • 批号22+ 
  • ★只做原装★正品现货★原盒原标★
  • QQ:2355507162QQ:2355507162 复制
    QQ:2355507165QQ:2355507165 复制
  • 86-755-83616256 QQ:2355507162QQ:2355507165
  • MAX222CPN+图
  • 深圳市晶美隆科技有限公司

     该会员已使用本站14年以上
  • MAX222CPN+
  • 数量11530 
  • 厂家Maxim IC 
  • 封装PDIP-18 
  • 批号23+ 
  • 全新原装现货热卖
  • QQ:2885348317QQ:2885348317 复制
    QQ:2885348339QQ:2885348339 复制
  • 0755-83209630 QQ:2885348317QQ:2885348339
  • MAX222CPN图
  • 深圳市恒达亿科技有限公司

     该会员已使用本站12年以上
  • MAX222CPN
  • 数量3000 
  • 厂家MAXIN 
  • 封装DIP18 
  • 批号23+ 
  • 全新原装公司现货销售
  • QQ:1245773710QQ:1245773710 复制
    QQ:867789136QQ:867789136 复制
  • 0755-82772189 QQ:1245773710QQ:867789136
  • MAX222CPN图
  • 上海熠富电子科技有限公司

     该会员已使用本站15年以上
  • MAX222CPN
  • 数量9520 
  • 厂家MAXIM 
  • 封装N/A 
  • 批号2024 
  • 上海原装现货库存,欢迎查询!
  • QQ:2719079875QQ:2719079875 复制
    QQ:2300949663QQ:2300949663 复制
  • 15821228847 QQ:2719079875QQ:2300949663

产品型号MAX222CPN的概述

MAX222CPN芯片概述 MAX222CPN是由Maxim Integrated(目前已被Analog Devices收购)生产的一款集成电路,主要用于信号隔离及增强信号的稳定性。该芯片专为高压和低压的接口电路设计,具有双通道的RS-232信号收发功能,是数据传输和通信领域常见的解决方案之一。此芯片的设计目标是提供可靠的数据传输,即使在较差的电气环境中,也能保持稳定的通信性能。 详细参数 MAX222CPN的主要特性包括: 1. 电源电压范围:4.5V至10V,支持多种电源环境。 2. 传输速率:支持高达120kbps的波特率,适合多数数据通讯需求。 3. 数据接收和发送通道:提供两个通道进行双向数据传输。 4. 工作温度范围:-40°C至+85°C,为恶劣环境下的应用提供支持。 5. 在负载条件下:可在最大负载下保持稳定的工作状态,确保数据传输的可靠性。 6. 保护功能:内置过压保...

产品型号MAX222CPN的Datasheet PDF文件预览

19-4323; Rev 9; 4/00  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
General Description  
____________________________Features  
The MAX220–MAX249 family of line drivers/receivers is  
intended for all EIA/TIA-232E and V.28/V.24 communica-  
tions interfaces, particularly applications where ±±2V is  
not available.  
These parts are especially useful in battery-powered sys-  
tems, since their low-power shutdown mode reduces  
power dissipation to less than 5µW. The MAX225,  
MAX233, MAX235, and MAX245/MAX246/MAX247 use  
no external components and are recommended for appli-  
cations where printed circuit board space is critical.  
Superior to Bipolar  
o Operate from Single +5V Power Supply  
(+5V and +12V—MAX231/MAX239)  
o Low-Power Receive Mode in Shutdown  
(MAX223/MAX242)  
o Meet All EIA/TIA-232E and V.28 Specifications  
o Multiple Drivers and Receivers  
o 3-State Driver and Receiver Outputs  
o Open-Line Detection (MAX243)  
Ordering Information  
________________________Applications  
Portable Computers  
PART  
TEMP. RANGE  
0°C to +70°C  
PIN-PACKAGE  
±6 Plastic DIP  
±6 Narrow SO  
±6 Wide SO  
Dice*  
MAX220CPE  
MAX220CSE  
MAX220CWE  
MAX220C/D  
MAX220EPE  
MAX220ESE  
MAX220EWE  
MAX220EJE  
MAX220MJE  
Low-Power Modems  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
Interface Translation  
Battery-Powered RS-232 Systems  
Multidrop RS-232 Networks  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-55°C to +±25°C  
±6 Plastic DIP  
±6 Narrow SO  
±6 Wide SO  
±6 CERDIP  
±6 CERDIP  
Ordering Information continued at end of data sheet.  
*Contact factory for dice specifications.  
Selection Table  
Power  
Supply  
(V)  
+5  
+5  
No. of  
RS-232  
Drivers/Rx Ext. Caps (µF)  
2/2  
2/2  
4/5  
5/5  
5/0  
2/2  
Nominal  
SHDN  
Rx  
Part  
No. of  
Cap. Value & Three- Active in Data Rate  
Number  
MAX220  
MAX222  
State  
No  
Yes  
Yes  
Yes  
Yes  
No  
SHDN  
(kbps)  
±20  
200  
±20  
±20  
±20  
±20  
Features  
4
4
4
0
4
2
4.7/±0  
0.±  
±.0 (0.±)  
±.0 (0.±)  
±.0 (0.±)  
Ultra-low-power, industry-standard pinout  
Low-power shutdown  
MAX24± and receivers active in shutdown  
Available in SO  
MAX223 (MAX2±3) +5  
MAX225 +5  
MAX230 (MAX200) +5  
5 drivers with shutdown  
MAX23± (MAX20±) +5 and  
Standard +5/+±2V or battery supplies;  
same functions as MAX232  
Industry standard  
Higher slew rate, small caps  
No external caps  
No external caps, high slew rate  
Replaces ±488  
No external caps  
Shutdown, three state  
Complements IBM PC serial port  
Replaces ±488 and ±489  
Standard +5/+±2V or battery supplies;  
single-package solution for IBM PC serial port  
DIP or flatpack package  
Complete IBM PC serial port  
Separate shutdown and enable  
Open-line detection simplifies cabling  
High slew rate  
+7.5 to +±3.2  
MAX232 (MAX202) +5  
MAX232A +5  
MAX233 (MAX203) +5  
MAX233A +5  
MAX234 (MAX204) +5  
MAX235 (MAX205) +5  
MAX236 (MAX206) +5  
MAX237 (MAX207) +5  
MAX238 (MAX208) +5  
MAX239 (MAX209) +5 and  
2/2  
2/2  
2/2  
2/2  
4/0  
5/5  
4/3  
5/3  
4/4  
3/5  
4
4
0
0
4
0
4
4
4
2
±.0 (0.±)  
0.±  
±.0 (0.±)  
±.0 (0.±)  
±.0 (0.±)  
±.0 (0.±)  
±.0 (0.±)  
No  
No  
No  
No  
No  
Yes  
Yes  
No  
No  
No  
±20 (64)  
200  
±20  
200  
±20  
±20  
±20  
±20  
±20  
±20  
+7.5 to +±3.2  
+5  
MAX24± (MAX2±±) +5  
MAX240  
5/5  
4/5  
2/2  
2/2  
8/±0  
8/±0  
8/±0  
8/9  
8/8  
6/±0  
4
4
4
4
4
0
0
0
4
4
±.0  
±.0 (0.±)  
0.±  
0.±  
±.0  
±.0  
±.0  
Yes  
Yes  
Yes  
No  
±20  
±20  
200  
200  
±20  
±20  
±20  
±20  
±20  
±20  
MAX242  
MAX243  
MAX244  
MAX245  
MAX246  
MAX247  
MAX248  
MAX249  
+5  
+5  
+5  
+5  
+5  
+5  
+5  
+5  
No  
Yes  
Yes  
Yes  
Yes  
Yes  
High slew rate, int. caps, two shutdown modes  
High slew rate, int. caps, three shutdown modes  
High slew rate, int. caps, nine operating modes  
High slew rate, selective half-chip enables  
Available in quad flatpack package  
________________________________________________________________ Maxim Integrated Products  
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.  
For small orders, phone 1-800-835-8769.  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
ABSOLUTE MAXIMUM RATINGS—MAX220/222/232A/233A/242/243  
Supply Voltage (V ) ...............................................-0.3V to +6V  
CC  
20-Pin Plastic DIP (derate 8.00mW/°C above +70°C) ..440mW  
±6-Pin Narrow SO (derate 8.70mW/°C above +70°C) ...696mW  
±6-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW  
±8-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW  
20-Pin Wide SO (derate ±0.00mW/°C above +70°C)....800mW  
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW  
±6-Pin CERDIP (derate ±0.00mW/°C above +70°C).....800mW  
±8-Pin CERDIP (derate ±0.53mW/°C above +70°C).....842mW  
Operating Temperature Ranges  
MAX2_ _AC_ _, MAX2_ _C_ _.............................0°C to +70°C  
MAX2_ _AE_ _, MAX2_ _E_ _ ..........................-40°C to +85°C  
MAX2_ _AM_ _, MAX2_ _M_ _.......................-55°C to +±25°C  
Storage Temperature Range.............................-65°C to +±60°C  
Lead Temperature (soldering, ±0sec) .............................+300°C  
Input Voltages  
T
R
R
..............................................................-0.3V to (V  
- 0.3V)  
CC  
IN  
(Except MAX220) ........................................................±30V  
(MAX220).....................................................................±25V  
IN  
IN  
T
T
(Except MAX220) (Note ±) .......................................±±5V  
(MAX220)...............................................................±±3.2V  
OUT  
OUT  
Output Voltages  
...................................................................................±±5V  
T
OUT  
R
.........................................................-0.3V to (V  
+ 0.3V)  
OUT  
CC  
Driver/Receiver Output Short Circuited to GND.........Continuous  
Continuous Power Dissipation (T = +70°C)  
A
±6-Pin Plastic DIP (derate ±0.53mW/°C above +70°C)....842mW  
±8-Pin Plastic DIP (derate ±±.±±mW/°C above +70°C)....889mW  
Note 1: Input voltage measured with T  
in high-impedance state, SHDN or V  
= 0V.  
OUT  
CC  
Note 2: ꢁor the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed ±3V.  
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional  
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to  
absolute maximum rating conditions for extended periods may affect device reliability.  
ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243  
(V  
= +5V ±±0ꢀ, C±–C4 = 0.±µꢁF MAX220, C± = 0.047µꢁ, C2–C4 = 0.33µꢁ, T = T  
to T  
F unless otherwise noted.)  
MAX  
CC  
A
MIN  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX UNITS  
RS-232 TRANSMITTERS  
Output Voltage Swing  
All transmitter outputs loaded with 3kto GND  
±5  
±8  
±.4  
±.4  
V
Input Logic Threshold Low  
0.8  
V
All except MAX220  
2
Input Logic Threshold High  
Logic Pull-Up/lnput Current  
Output Leakage Current  
V
MAX220: V  
= 5.0V  
2.4  
CC  
All except MAX220, normal operation  
5
40  
±±  
µA  
µA  
±0.0±  
±0.0±  
±0.0±  
200  
SHDN = 0V, MAX222/242, shutdown, MAX220  
±±0  
±±0  
±±6  
V
CC  
V
CC  
= 5.5V, SHDN = 0V, V  
= ±±5V, MAX222/242  
OUT  
= SHDN = 0V, V  
= ±±5V  
OUT  
Data Rate  
All except MAX220, normal operation  
kb/s  
mA  
Transmitter Output Resistance  
Output Short-Circuit Current  
RS-232 RECEIVERS  
V
CC  
= V+ = V- = 0V, V  
= ±2V  
OUT  
300  
±7  
±0M  
±22  
V
OUT  
= 0V  
RS-232 Input Voltage Operating Range  
±30  
V
V
All except MAX243 R2  
0.8  
-3  
±.3  
IN  
RS-232 Input Threshold Low  
RS-232 Input Threshold High  
RS-232 Input Hysteresis  
V
V
= 5V  
= 5V  
CC  
MAX243 R2 (Note 2)  
IN  
All except MAX243 R2  
±.8  
-0.5  
0.5  
±
2.4  
-0.±  
±
IN  
V
V
CC  
MAX243 R2 (Note 2)  
IN  
All except MAX243, V = 5V, no hysteresis in shdn.  
CC  
0.2  
3
MAX243  
RS-232 Input Resistance  
5
7
kΩ  
V
TTL/CMOS Output Voltage Low  
TTL/CMOS Output Voltage High  
I
I
= 3.2mA  
= -±.0mA  
0.2  
0.4  
OUT  
3.5  
-2  
V
- 0.2  
V
OUT  
CC  
Sourcing V  
= GND  
-±0  
30  
OUT  
TTL/CMOS Output Short-Circuit Current  
mA  
Shrinking V  
= V  
±0  
OUT  
CC  
2
_______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243 (continued)  
(V  
= +5V ±±0ꢀ, C±–C4 = 0.±µꢁF MAX220, C± = 0.047µꢁ, C2–C4 = 0.33µꢁ, T = T  
to T  
F unless otherwise noted.)  
MAX  
CC  
A
MIN  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX UNITS  
SHDN = V or EN = V (SHDN = 0V for MAX222),  
CC  
CC  
TTL/CMOS Output Leakage Current  
±0.05  
±±0  
0.8  
µA  
0V V  
V  
OUT  
CC  
MAX242  
MAX242  
±.4  
±.4  
V
V
V
EN Input Threshold Low  
EN Input Threshold High  
Operating Supply Voltage  
2.0  
4.5  
5.5  
2
MAX220  
0.5  
4
No load  
MAX222/232A/233A/242/243  
MAX220  
±0  
V
CC  
Supply Current (SHDN = V ),  
CC  
mA  
µA  
ꢁigures 5, 6, ±±, ±9  
±2  
±5  
0.±  
2
3kload  
both inputs  
MAX222/232A/233A/242/243  
T
A
T
A
T
A
T
A
= +25°C  
±0  
50  
= 0°C to +70°C  
= -40°C to +85°C  
= -55°C to +±25°C  
Shutdown Supply Current  
MAX222/242  
2
50  
35  
±00  
±±  
0.8  
MAX222/242  
MAX222/242  
MAX222/242  
µA  
V
SHDN Input Leakage Current  
SHDN Threshold Low  
±.4  
±.4  
2.0  
6
V
SHDN Threshold High  
C = 50pꢁ to 2500pꢁ,  
L
MAX222/232A/233A/242/243  
MAX220  
±2  
3
30  
30  
R = 3kto 7k,  
L
Transition Slew Rate  
V
CC  
= 5V, T = +25°C,  
V/µs  
µs  
A
measured from +3V  
to -3V or -3V to +3V  
±.5  
MAX222/232A/233A/242/243  
MAX220  
±.3  
4
3.5  
±0  
3.5  
±0  
±
t
t
t
t
PHLT  
PLHT  
PHLR  
PLHR  
Transmitter Propagation Delay  
TLL to RS-232 (normal operation),  
ꢁigure ±  
MAX222/232A/233A/242/243  
MAX220  
±.5  
5
MAX222/232A/233A/242/243  
MAX220  
0.5  
0.6  
0.6  
0.8  
0.5  
2.5  
±25  
±60  
Receiver Propagation Delay  
RS-232 to TLL (normal operation),  
ꢁigure 2  
3
µs  
µs  
MAX222/232A/233A/242/243  
MAX220  
±
3
t
t
t
t
MAX242  
±0  
±0  
500  
500  
PHLS  
PLHS  
ER  
Receiver Propagation Delay  
RS-232 to TLL (shutdown), ꢁigure 2  
MAX242  
Receiver-Output EnableTime, ꢁigure 3  
Receiver-Output DisableTime, ꢁigure 3  
MAX242  
ns  
ns  
MAX242  
DR  
Transmitter-Output Enable Time  
(SHDN goes high), ꢁigure 4  
MAX222/242, 0.±µꢁ caps  
(includes charge-pump start-up)  
t
t
t
t
250  
600  
µs  
ns  
ns  
ns  
ET  
Transmitter-Output Disable Time  
(SHDN goes low), ꢁigure 4  
MAX222/242, 0.±µꢁ caps  
DT  
MAX222/232A/233A/242/243  
MAX220  
300  
2000  
±00  
Transmitter + to - Propagation  
Delay Difference (normal operation)  
- t  
PHLT PLHT  
MAX222/232A/233A/242/243  
MAX220  
Receiver + to - Propagation  
Delay Difference (normal operation)  
- t  
PHLR PLHR  
225  
Note 3: MAX243 R2  
is guaranteed to be low when R2 is 0V or is floating.  
IN  
OUT  
_______________________________________________________________________________________  
3
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
__________________________________________Typical Operating Characteristics  
MAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243  
AVAILABLE OUTPUT CURRENT  
vs. DATA RATE  
MAX222/MAX242  
ON-TIME EXITING SHUTDOWN  
OUTPUT VOLTAGE vs. LOAD CURRENT  
10  
8
11  
10  
+10V  
1µF  
V+  
OUTPUT LOAD CURRENT  
FLOWS FROM V+ TO V-  
1µF CAPS  
EITHER V+ OR V- LOADED  
V+  
6
0.1µF CAPS  
+5V  
+5V  
ALL CAPS  
0.1µF  
1µF  
V
= 5V  
CC  
9
8
7
6
5
4
4
1µF  
NO LOAD ON  
SHDN  
V
= +5.25V  
= +4.75V  
0V  
0V  
2
0
TRANSMITTER OUTPUTS  
(EXCEPT MAX220, MAX233A)  
CC  
ALL CAPS  
0.1µF  
V- LOADED, NO LOAD ON V+  
-2  
-4  
-6  
-8  
-10  
V
CC  
1µF CAPS  
0.1µF  
0.1µF CAPS  
V-  
V-  
V+ LOADED, NO LOAD ON V-  
10 15 20 25  
LOAD CURRENT (mA)  
-10V  
0
5
0
10  
20  
30  
40  
50  
60  
500µs/div  
DATA RATE (kbits/sec)  
4
_______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
ABSOLUTE MAXIMUM RATINGS—MAX223/MAX230–MAX241  
V
...........................................................................-0.3V to +6V  
20-Pin Wide SO (derate ±0 00mW/°C above +70°C).......800mW  
24-Pin Wide SO (derate ±±.76mW/°C above +70°C).......94±mW  
28-Pin Wide SO (derate ±2.50mW/°C above +70°C) .............±W  
44-Pin Plastic ꢁP (derate ±±.±±mW/°C above +70°C) .....889mW  
±4-Pin CERDIP (derate 9.09mW/°C above +70°C)..........727mW  
±6-Pin CERDIP (derate ±0.00mW/°C above +70°C)........800mW  
20-Pin CERDIP (derate ±±.±±mW/°C above +70°C)........889mW  
24-Pin Narrow CERDIP  
CC  
V+................................................................(V  
V- ............................................................................+0.3V to -±4V  
Input Voltages  
T
R
- 0.3V) to +±4V  
CC  
............................................................-0.3V to (V  
+ 0.3V)  
IN  
CC  
......................................................................................±30V  
IN  
Output Voltages  
...................................................(V+ + 0.3V) to (V- - 0.3V)  
T
OUT  
R
.........................................................-0.3V to (V  
+ 0.3V)  
(derate ±2.50mW/°C above +70°C) ..............±W  
OUT  
CC  
Short-Circuit Duration, T  
Continuous Power Dissipation (T = +70°C)  
±4-Pin Plastic DIP (derate ±0.00mW/°C above +70°C)....800mW  
±6-Pin Plastic DIP (derate ±0.53mW/°C above +70°C)....842mW  
20-Pin Plastic DIP (derate ±±.±±mW/°C above +70°C)....889mW  
24-Pin Narrow Plastic DIP  
......................................Continuous  
24-Pin Sidebraze (derate 20.0mW/°C above +70°C)..........±.6W  
28-Pin SSOP (derate 9.52mW/°C above +70°C).............762mW  
Operating Temperature Ranges  
MAX2 _ _ C _ _......................................................0°C to +70°C  
MAX2 _ _ E _ _...................................................-40°C to +85°C  
MAX2 _ _ M _ _ ...............................................-55°C to +±25°C  
Storage Temperature Range.............................-65°C to +±60°C  
Lead Temperature (soldering, ±0sec) .............................+300°C  
OUT  
A
(derate ±3.33mW/°C above +70°C) ..........±.07W  
24-Pin Plastic DIP (derate 9.09mW/°C above +70°C)......500mW  
±6-Pin Wide SO (derate 9.52mW/°C above +70°C).........762mW  
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional  
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to  
absolute maximum rating conditions for extended periods may affect device reliability.  
ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241  
(MAX223/230/232/234/236/237/238/240/24±, V  
= +5V ±±0; MAX233/MAX235, V  
= 5V ±5ꢀF C±–C4 = ±.0µꢁ; MAX23±/MAX239,  
CC  
CC  
V
CC  
= 5V ±±0ꢀ; V+ = 7.5V to ±3.2V; T = T  
to T  
; unless otherwise noted.)  
A
MIN  
MAX  
PARAMETER  
CONDITIONS  
MIN  
TYP  
±7.3  
5
MAX  
UNITS  
Output Voltage Swing  
All transmitter outputs loaded with 3kto ground  
±5.0  
V
MAX232/233  
±0  
±5  
±
No load,  
V
CC  
Power-Supply Current  
MAX223/230/234–238/240/24±  
7
mA  
mA  
T
A
= +25°C  
MAX23±/239  
MAX23±  
0.4  
±.8  
5
5
V+ Power-Supply Current  
MAX239  
±5  
50  
±0  
0.8  
MAX223  
±5  
±
Shutdown Supply Current  
Input Logic Threshold Low  
T
A
= +25°C  
µA  
V
MAX230/235/236/240/24±  
T
T
; EN, SHDN (MAX233); EN, SHDN (MAX230/235–24±)  
IN  
2.0  
2.4  
IN  
Input Logic Threshold High  
V
EN, SHDN (MAX223);  
EN, SHDN (MAX230/235/236/240/24±)  
Logic Pull-Up Current  
T
IN  
= 0V  
±.5  
200  
30  
µA  
V
Receiver Input Voltage  
Operating Range  
-30  
_______________________________________________________________________________________  
5
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241 (continued)  
(MAX223/230/232/234/236/237/238/240/24±, V  
= +5V ±±0; MAX233/MAX235, V  
= 5V ±5ꢀF C±–C4 = ±.0µꢁ; MAX23±/MAX239,  
CC  
CC  
V
CC  
= 5V ±±0ꢀ; V+ = 7.5V to ±3.2V; T = T  
to T ; unless otherwise noted.)  
A
MIN  
MAX  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX UNITS  
Normal operation  
0.8  
±.2  
SHDN = 5V (MAX223)  
SHDN = 0V (MAX235/236/240/24±)  
T
V
= +25°C,  
A
RS-232 Input Threshold Low  
RS-232 Input Threshold High  
V
= 5V  
CC  
Shutdown (MAX223)  
SHDN = 0V,  
0.6  
±.5  
±.7  
±.5  
EN = 5V (R4 , R5  
)
IN  
IN  
Normal operation  
SHDN = 5V (MAX223)  
SHDN = 0V (MAX235/236/240/24±)  
2.4  
T
A
= +25°C,  
V
V
= 5V  
CC  
Shutdown (MAX223)  
SHDN = 0V,  
2.4  
EN = 5V (R4 F R5  
)
IN  
IN  
RS-232 Input Hysteresis  
V
= 5V, no hysteresis in shutdown  
= 5V  
0.2  
3
0.5  
5
±.0  
7
V
kΩ  
V
CC  
RS-232 Input Resistance  
T
A
= +25°C, V  
CC  
TTL/CMOS Output Voltage Low  
TTL/CMOS Output Voltage High  
I
I
= ±.6mA (MAX23±/232/233, I = 3.2mA)  
OUT  
0.4  
OUT  
OUT  
= -±mA  
3.5  
V
- 0.4  
V
CC  
0V R  
EN = V  
V ; EN = 0V (MAX223);  
CC  
(MAX235–24± )  
OUT  
TTL/CMOS Output Leakage Current  
Receiver Output Enable Time  
0.05  
±±0  
µA  
ns  
CC  
MAX223  
600  
400  
900  
250  
0.5  
4
Normal  
operation  
MAX235/236/239/240/24±  
MAX223  
Normal  
operation  
Receiver Output Disable Time  
Propagation Delay  
ns  
µs  
MAX235/236/239/240/24±  
Normal operation  
±0  
40  
40  
RS-232 IN to  
TTL/CMOS OUT,  
C = ±50pꢁ  
L
t
PHLS  
PLHS  
SHDN = 0V  
(MAX223)  
t
6
MAX223/MAX230/MAX234–24±, T = +25°C, V  
= 5V,  
A
CC  
R = 3kto 7kF C = 50pꢁ to 2500pꢁ, measured from  
3
5.±  
4
30  
30  
L
L
+3V to -3V or -3V to +3V  
Transition Region Slew Rate  
Transmitter Output Resistance  
V/µs  
MAX23±/MAX232/MAX233, T = +25°C, V  
= 5V,  
CC  
A
R = 3kto 7k, C = 50pꢁ to 2500pꢁ, measured from  
L
L
+3V to -3V or -3V to +3V  
V
CC  
= V+ = V- = 0V, V  
= ±2V  
OUT  
300  
Transmitter Output Short-Circuit  
Current  
±±0  
mA  
6
_______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
__________________________________________Typical Operating Characteristics  
MAX223/MAX230–MAX241  
TRANSMITTER OUTPUT VOLTAGE (V  
vs. LOAD CAPACITANCE AT  
DIFFERENT DATA RATES  
)
OH  
TRANSMITTER SLEW RATE  
vs. LOAD CAPACITANCE  
TRANSMITTER OUTPUT  
VOLTAGE (V ) vs. V  
OH  
CC  
8.5  
8.0  
7.5  
7.0  
6.5  
12.0  
11.0  
10.0  
9.0  
7.4  
7.2  
7.0  
6.8  
6.6  
6.4  
6.2  
6.0  
1 TRANSMITTER LOADED  
T
= +25°C  
CC  
A
V
2 TRANSMITTERS  
LOADED  
= +5V  
LOADED, R = 3kΩ  
L
C1C4 = 1µF  
1 TRANSMITTER  
LOADED  
2 TRANSMITTERS  
LOADED  
160kbits/sec  
80kbits/sec  
20kbits/sec  
3 TRANS-  
MITTERS  
LOADED  
8.0  
7.0  
T
= +25°C  
T = +25°C  
A
A
3 TRANSMITTERS  
LOADED  
6.0  
C1–C4 = 1µF  
TRANSMITTER  
LOADS =  
V
= +5V  
CC  
3 TRANSMITTERS LOADED  
4 TRANSMITTERS  
LOADED  
5.0  
4.0  
R = 3kΩ  
L
4 TRANSMITTERS  
LOADED  
3k|| 2500pF  
C1C4 = 1µF  
4.5  
5.0  
5.5  
0
500  
1000  
1500  
2000  
2500  
0
500  
1000  
1500  
2000  
2500  
V
(V)  
LOAD CAPACITANCE (pF)  
LOAD CAPACITANCE (pF)  
CC  
TRANSMITTER OUTPUT VOLTAGE (V  
vs. LOAD CAPACITANCE AT  
DIFFERENT DATA RATES  
)
OL  
TRANSMITTER OUTPUT  
VOLTAGE (V ) vs. V  
TRANSMITTER OUTPUT VOLTAGE (V+, V-)  
vs. LOAD CURRENT  
OL  
CC  
10  
8
-6.0  
-6.2  
-6.4  
-6.6  
-6.8  
-7.0  
-7.2  
-7.4  
-7.6  
-6.0  
-6.5  
4 TRANS-  
MITTERS  
LOADED  
T
= +25°C  
A
T
= +25°C  
CC  
A
V
C1C4 = 1µF  
TRANSMITTER  
LOADS =  
= +5V  
6
3 TRANSMITTERS LOADED  
T
= +25°C  
CC  
A
V
R = 3kΩ  
= +5V  
L
4
3k|| 2500pF  
C1C4 = 1µF  
-7.0  
-7.5  
-8.0  
-8.5  
-9.0  
C1C4 = 1µF  
2
V- LOADED,  
NO LOAD  
ON V+  
V+ AND V-  
EQUALLY  
LOADED  
V+ LOADED,  
NO LOAD  
ON V-  
160kbits/sec  
80kbits/sec  
20Kkbits/sec  
0
1 TRANS-  
-2  
-4  
-6  
MITTER  
LOADED  
3 TRANS-  
MITTERS  
LOADED  
2 TRANS-  
MITTERS  
LOADED  
-8  
ALL TRANSMITTERS UNLOADED  
-10  
0
5
10 15 20 25 30 35 40 45 50  
CURRENT (mA)  
0
500  
1000  
1500  
2000  
2500  
4.5  
5.0  
5.5  
LOAD CAPACITANCE (pF)  
V
(V)  
CC  
V+, V- WHEN EXITING SHUTDOWN  
(1µF CAPACITORS)  
MAX220-13  
V+  
O
V-  
SHDN*  
500ms/div  
*SHUTDOWN POLARITY IS REVERSED  
FOR NON MAX241 PARTS  
_______________________________________________________________________________________  
7
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
ABSOLUTE MAXIMUM RATINGS—MAX225/MAX244–MAX249  
Supply Voltage (V ) ...............................................-0.3V to +6V  
CC  
Input Voltages  
Continuous Power Dissipation (T = +70°C)  
A
28-Pin Wide SO (derate ±2.50mW/°C above +70°C) .............±W  
40-Pin Plastic DIP (derate ±±.±±mW/°C above +70°C) ...6±±mW  
44-Pin PLCC (derate ±3.33mW/°C above +70°C) ...........±.07W  
Operating Temperature Ranges  
T
F ENA, ENB, ENR, ENT, ENRA,  
IN  
ENRB, ENTA, ENTB..................................-0.3V to (V  
+ 0.3V)  
CC  
R
IN  
.....................................................................................±25V  
T
R
MAX225C_ _, MAX24_C_ _ ..................................0°C to +70°C  
MAX225E_ _, MAX24_E_ _ ...............................-40°C to +85°C  
Storage Temperature Range.............................-65°C to +±60°C  
Lead Temperature (soldering,±0sec) ..............................+300°C  
OUT  
OUT  
Short Circuit (one output at a time)  
T
OUT  
R
OUT  
Note 4: Input voltage measured with transmitter output in a high-impedance state, shutdown, or V  
= 0V.  
CC  
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional  
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to  
absolute maximum rating conditions for extended periods may affect device reliability.  
ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249  
(MAX225, V  
= 5.0V ±5ꢀ; MAX244–MAX249, V  
= +5.0V ±±0ꢀ, external capacitors C±–C4 = ±µꢁ; T = T  
to T ; unless oth-  
MAX  
CC  
CC  
A
MIN  
erwise noted.)  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
RS-232 TRANSMITTERS  
Input Logic Threshold Low  
Input Logic Threshold High  
±.4  
±.4  
0.8  
V
V
2
Normal operation  
Shutdown  
±0  
50  
±±  
64  
Logic Pull-Up/lnput Current  
Tables ±a–±d  
µA  
±0.0±  
±20  
±7.5  
Data Rate  
Tables ±a–±d, normal operation  
kbits/sec  
V
Output Voltage Swing  
All transmitter outputs loaded with 3kto GND  
±5  
ENA, ENB, ENT, ENTA, ENTB =  
±0.0±  
±0.0±  
±25  
±25  
V
V
= ±±5V  
CC, OUT  
Output Leakage Current (shutdown)  
Tables ±a–±d  
µA  
V
V
= 0V,  
= ±±5V  
CC  
OUT  
Transmitter Output Resistance  
Output Short-Circuit Current  
RS-232 RECEIVERS  
V
V
= V+ = V- = 0V, V  
= ±2V (Note 4)  
300  
±7  
±0M  
±30  
mA  
CC  
OUT  
= 0V  
OUT  
RS-232 Input Voltage Operating Range  
RS-232 Input Threshold Low  
RS-232 Input Threshold High  
RS-232 Input Hysteresis  
±25  
V
V
V
V
V
= 5V  
= 5V  
= 5V  
0.8  
±.3  
±.8  
0.5  
5
CC  
CC  
CC  
2.4  
±.0  
7
V
0.2  
3
V
RS-232 Input Resistance  
kΩ  
V
TTL/CMOS Output Voltage Low  
TTL/CMOS Output Voltage High  
I
I
= 3.2mA  
= -±.0mA  
0.2  
0.4  
OUT  
3.5  
-2  
V
- 0.2  
V
OUT  
CC  
Sourcing V  
= GND  
-±0  
OUT  
TTL/CMOS Output Short-Circuit Current  
TTL/CMOS Output Leakage Current  
mA  
µA  
Shrinking V  
= V  
±0  
30  
OUT  
CC  
Normal operation, outputs disabled,  
Tables ±a–±d, 0V V V , ENR_ = V  
CC  
±0.05  
±0.±0  
OUT  
CC  
8
_______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249 (continued)  
(MAX225, V  
= 5.0V ±5ꢀ; MAX244–MAX249, V  
= +5.0V ±±0ꢀ, external capacitors C±–C4 = ±µꢁ; T = T  
to T  
; unless oth-  
MAX  
CC  
CC  
A
MIN  
erwise noted.)  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX UNITS  
POWER SUPPLY AND CONTROL LOGIC  
MAX225  
4.75  
4.5  
5.25  
V
Operating Supply Voltage  
MAX244–MAX249  
MAX225  
5.5  
±0  
±±  
40  
57  
8
20  
No load  
MAX244–MAX249  
MAX225  
30  
V
CC  
Supply Current  
mA  
(normal operation)  
3kloads on  
all outputs  
MAX244–MAX249  
T
T
= +25°C  
25  
µA  
50  
A
Shutdown Supply Current  
Control Input  
= T  
to T  
MAX  
A
MIN  
Leakage current  
Threshold low  
Threshold high  
±±  
µA  
±.4  
±.4  
0.8  
V
2.4  
5
AC CHARACTERISTICS  
C = 50pꢁ to 2500pꢁ, R = 3kto 7k, V = 5V,  
L
A
L
CC  
Transition Slew Rate  
±0  
30  
V/µs  
µs  
T = +25°C, measured from +3V to -3V or -3V to +3V  
Transmitter Propagation Delay  
TLL to RS-232 (normal operation),  
ꢁigure ±  
t
t
t
t
t
t
±.3  
±.5  
0.6  
0.6  
0.6  
3.0  
3.5  
3.5  
±.5  
±.5  
±0  
PHLT  
PLHT  
PHLR  
PLHR  
PHLS  
PLHS  
Receiver Propagation Delay  
TLL to RS-232 (normal operation),  
ꢁigure 2  
µs  
µs  
Receiver Propagation Delay  
TLL to RS-232 (low-power mode),  
ꢁigure 2  
±0  
Transmitter + to - Propagation  
Delay Difference (normal operation)  
t
- t  
350  
350  
ns  
ns  
PHLT PLHT  
Receiver + to - Propagation  
Delay Difference (normal operation)  
t
- t  
PHLR PLHR  
Receiver-Output EnableTime, ꢁigure 3  
Receiver-Output DisableTime, ꢁigure 3  
t
t
±00  
±00  
500  
500  
ns  
ns  
ER  
DR  
MAX246–MAX249  
(excludes charge-pump start-up)  
5
µs  
Transmitter Enable Time  
t
t
ET  
MAX225/MAX245–MAX249  
(includes charge-pump start-up)  
±0  
ms  
ns  
Transmitter Disable Time, ꢁigure 4  
±00  
DT  
Note 5: The 300minimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or V  
0V is ±0Mas is implied by the leakage specification.  
=
CC  
_______________________________________________________________________________________  
9
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
__________________________________________Typical Operating Characteristics  
MAX225/MAX244–MAX249  
TRANSMITTER OUTPUT VOLTAGE (V+, V-)  
TRANSMITTER SLEW RATE  
vs. LOAD CAPACITANCE  
OUTPUT VOLTAGE  
vs. LOAD CURRENT FOR V+ AND V-  
vs. LOAD CAPACITANCE AT  
DIFFERENT DATA RATES  
18  
16  
14  
12  
10  
8
10  
8
9.0  
8.5  
8.0  
7.5  
7.0  
6.5  
6.0  
5.5  
5.0  
V
= 5V WITH ALL TRANSMITTERS DRIVEN  
CC  
V
= 5V  
CC  
LOADED WITH 5kΩ  
V+ AND V- LOADED  
10kb/sec  
6
4
2
EITHER V+ OR  
V- LOADED  
20kb/sec  
EXTERNAL POWER SUPPLY  
V
CC  
= 5V  
1µF CAPACITORS  
EXTERNAL CHARGE PUMP  
1µF CAPACITORS  
40kb/sec  
60kb/sec  
8 TRANSMITTERS  
0
40kb/s DATA RATE  
8 TRANSMITTERS  
LOADED WITH 3kΩ  
DRIVING 5kAND  
-2  
2000pF AT 20kbits/sec  
V- LOADED  
-4  
-6  
6
4
100kb/sec  
200kb/sec  
V+ AND V- LOADED  
-8  
V+ LOADED  
30 35  
ALL CAPACITIORS 1µF  
2
-10  
0
1
2
3
4
5
0
5
10  
15  
20  
25  
0
1
2
3
4
5
LOAD CAPACITANCE (nF)  
LOAD CURRENT (mA)  
LOAD CAPACITANCE (nF)  
10 ______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
+3V  
0V*  
50%  
50%  
50%  
+3V  
INPUT  
INPUT  
0V  
V
CC  
OUTPUT  
50%  
GND  
V+  
0V  
V-  
OUTPUT  
t
t
t
t
PHLR  
PHLS  
PLHR  
PLHS  
t
t
PHLT  
PLHT  
*EXCEPT FOR R2 ON THE MAX243  
WHERE -3V IS USED.  
Figure 1. Transmitter Propagation-Delay Timing  
Figure 2. Receiver Propagation-Delay Timing  
EN  
1k  
R OUT  
X
R
V
- 2V  
X
R IN  
X
CC  
+3V  
SHDN  
0V  
a) TEST CIRCUIT  
150pF  
0V  
OUTPUT DISABLE TIME (t  
)
DT  
+3V  
EN INPUT  
V+  
+5V  
EN  
0V  
OUTPUT ENABLE TIME (t  
)
ER  
-5V  
+3.5V  
V-  
RECEIVER  
OUTPUTS  
+0.8V  
a) TIMING DIAGRAM  
b) ENABLE TIMING  
+3V  
EN  
T
X
1 OR 0  
0V  
EN INPUT  
50pF  
3k  
OUTPUT DISABLE TIME (t  
)
DR  
V
OH  
V
OH  
- 0.5V  
RECEIVER  
OUTPUTS  
V
- 2V  
CC  
b) TEST CIRCUIT  
V
+ 0.5V  
OL  
V
OL  
c) DISABLE TIMING  
Figure 3. Receiver-Output Enable and Disable Timing  
______________________________________________________________________________________ 11  
Figure 4. Transmitter-Output Disable Timing  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
Table 1a. MAX245 Control Pin Configurations  
OPERATION STATUS  
Normal Operation  
Normal Operation  
Shutdown  
TRANSMITTERS  
All Active  
RECEIVERS  
ENT  
ENR  
0
0
±
±
0
±
0
±
All Active  
All 3-State  
All Active  
All 3-State  
All Low-Power Receive Mode  
All 3-State  
Shutdown  
All 3-State  
Table 1b. MAX245 Control Pin Configurations  
TRANSMITTERS  
RECEIVERS  
OPERATION  
STATUS  
ENT  
ENR  
TA1–TA4  
TB1–TB4  
RA1–RA5  
All Active  
RB1–RB5  
All Active  
0
0
0
±
Normal Operation  
Normal Operation  
All Active  
All Active  
RA±–RA4 3-State,  
RA5 Active  
RB±–RB4 3-State,  
RB5 Active  
All Active  
All 3-State  
All Active  
All 3-State  
All Low-Power  
Receive Mode  
All Low-Power  
Receive Mode  
±
±
0
±
Shutdown  
Shutdown  
RA±–RA4 3-State,  
RA5 Low-Power  
Receive Mode  
RB±–RB4 3-State,  
RB5 Low-Power  
Receive Mode  
All 3-State  
All 3-State  
Table 1c. MAX246 Control Pin Configurations  
TRANSMITTERS  
RECEIVERS  
OPERATION  
STATUS  
ENA  
ENB  
TA1–TA4  
TB1–TB4  
RA1–RA5  
All Active  
RB1–RB5  
0
0
0
±
Normal Operation  
Normal Operation  
All Active  
All Active  
All Active  
RB±–RB4 3-State,  
RB5 Active  
All Active  
All 3-State  
All 3-State  
All Active  
All Active  
RA±–RA4 3-State,  
RA5 Active  
±
±
0
±
Shutdown  
Shutdown  
All Active  
RA±–RA4 3-State,  
RA5 Low-Power  
Receive Mode  
RB±–RB4 3-State,  
RA5 Low-Power  
Receive Mode  
All 3-State  
All 3-State  
12 ______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
Table 1d. MAX247/MAX248/MAX249 Control Pin Configurations  
TRANSMITTERS  
RECEIVERS  
RA1–RA4  
MAX247 TA1–TA4 TB1–TB4  
MAX248 TA1–TA4 TB1–TB4  
MAX249 TA1–TA3 TB1–TB3  
RB1–RB5  
RB1–RB4  
RB1–RB5  
OPERATION  
STATUS  
ENTA ENTB ENRA ENRB  
RA1–RA4  
RA1–RA5  
0
0
0
0
0
0
0
0
±
±
±
±
0
0
0
0
±
±
±
±
0
0
0
0
0
0
±
±
0
0
±
±
0
0
±
±
0
±
0
±
0
±
0
±
0
±
0
±
Normal Operation  
Normal Operation  
Normal Operation  
Normal Operation  
Normal Operation  
Normal Operation  
Normal Operation  
Normal Operation  
Normal Operation  
Normal Operation  
Normal Operation  
Normal Operation  
All Active All Active All Active  
All Active  
All 3-State, except  
RB5 stays active on  
MAX247  
All Active All Active All Active  
All Active All Active All 3-State  
All Active All Active All 3-State  
All Active All 3-State All Active  
All Active All 3-State All Active  
All Active All 3-State All 3-State  
All Active All 3-State All 3-State  
All 3-State All Active All Active  
All 3-State All Active All Active  
All 3-State All Active All 3-State  
All 3-State All Active All 3-State  
All Active  
All 3-State, except  
RB5 stays active on  
MAX247  
All Active  
All 3-State, except  
RB5 stays active on  
MAX247  
All Active  
All 3-State, except  
RB5 stays active on  
MAX247  
All Active  
All 3-State, except  
RB5 stays active on  
MAX247  
All Active  
All 3-State, except  
RB5 stays active on  
MAX247  
Low-Power  
All 3-State All 3-State  
Receive Mode  
Low-Power  
Receive Mode  
±
±
±
±
±
±
±
±
0
0
±
±
0
±
0
±
Shutdown  
Shutdown  
Shutdown  
Shutdown  
All 3-State, except  
RB5 stays active on  
MAX247  
Low-Power  
All 3-State All 3-State  
Receive Mode  
Low-Power  
Receive Mode  
All 3-State All 3-State All 3-State  
All 3-State All 3-State All 3-State  
All 3-State, except  
RB5 stays active on  
MAX247  
______________________________________________________________________________________ 13  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
mode, in three-state mode, or when device power is  
_______________Detailed Description  
removed. Outputs can be driven to ±±5V. The power-  
supply current typically drops to 8µA in shutdown mode.  
The MAX220 does not have pull-up resistors to force the  
ouputs of the unused drivers low. Connect unused inputs  
The MAX220–MAX249 contain four sections: dual  
charge-pump DC-DC voltage converters, RS-232 dri-  
vers, RS-232 receivers, and receiver and transmitter  
enable control inputs.  
to GND or V  
.
CC  
Dual Charge-Pump Voltage Converter  
The MAX220–MAX249 have two internal charge-pumps  
that convert +5V to ±±0V (unloaded) for RS-232 driver  
operation. The first converter uses capacitor C± to dou-  
ble the +5V input to +±0V on C3 at the V+ output. The  
second converter uses capacitor C2 to invert +±0V to  
-±0V on C4 at the V- output.  
The MAX239 has a receiver three-state control line, and  
the MAX223, MAX225, MAX235, MAX236, MAX240,  
and MAX24± have both a receiver three-state control  
line and a low-power shutdown control. Table 2 shows  
the effects of the shutdown control and receiver three-  
state control on the receiver outputs.  
The receiver TTL/CMOS outputs are in a high-imped-  
ance, three-state mode whenever the three-state enable  
line is high (for the MAX225/MAX235/MAX236/MAX239–  
MAX24±), and are also high-impedance whenever the  
shutdown control line is high.  
A small amount of power may be drawn from the +±0V  
(V+) and -±0V (V-) outputs to power external circuitry  
(see the Typical Operating Characteristics section),  
except on the MAX225 and MAX245–MAX247, where  
these pins are not available. V+ and V- are not regulated,  
so the output voltage drops with increasing load current.  
Do not load V+ and V- to a point that violates the mini-  
mum ±5V EIA/TIA-232E driver output voltage when  
sourcing current from V+ and V- to external circuitry.  
When in low-power shutdown mode, the driver outputs  
are turned off and their leakage current is less than ±µA  
with the driver output pulled to ground. The driver output  
leakage remains less than ±µA, even if the transmitter  
output is backdriven between 0V and (V  
+ 6V). Below  
CC  
When using the shutdown feature in the MAX222,  
MAX225, MAX230, MAX235, MAX236, MAX240,  
MAX24±, and MAX245–MAX249, avoid using V+ and V-  
to power external circuitry. When these parts are shut  
down, V- falls to 0V, and V+ falls to +5V. ꢁor applica-  
tions where a +±0V external supply is applied to the V+  
pin (instead of using the internal charge pump to gen-  
erate +±0V), the C± capacitor must not be installed and  
-0.5V, the transmitter is diode clamped to ground with  
±kseries impedance. The transmitter is also zener  
clamped to approximately V  
impedance of ±k.  
+ 6V, with a series  
CC  
The driver output slew rate is limited to less than 30V/µs  
as required by the EIA/TIA-232E and V.28 specifica-  
tions. Typical slew rates are 24V/µs unloaded and  
±0V/µs loaded with 3and 2500pꢁ.  
the SHDN pin must be tied to V . This is because V+  
CC  
is internally connected to V  
in shutdown mode.  
CC  
RS-232 Receivers  
EIA/TIA-232E and V.28 specifications define a voltage  
level greater than 3V as a logic 0, so all receivers invert.  
Input thresholds are set at 0.8V and 2.4V, so receivers  
respond to TTL level inputs as well as EIA/TIA-232E and  
V.28 levels.  
RS-232 Drivers  
The typical driver output voltage swing is ±8V when  
loaded with a nominal 5kRS-232 receiver and V  
=
CC  
+5V. Output swing is guaranteed to meet the EIA/TIA-  
232E and V.28 specification, which calls for ±5V mini-  
mum driver output levels under worst-case conditions.  
The receiver inputs withstand an input overvoltage up  
to ±25V and provide input terminating resistors with  
These include a minimum 3kload, V  
= +4.5V, and  
CC  
maximum operating temperature. Unloaded driver out-  
put voltage ranges from (V+ -±.3V) to (V- +0.5V).  
Table 2. Three-State Control of Receivers  
Input thresholds are both TTL and CMOS compatible.  
The inputs of unused drivers can be left unconnected  
PART  
SHDN  
EN  
EN(R)  
RECEIVERS  
SHDN  
Low  
X
High Impedance  
Active  
High Impedance  
since 400kinput pull-up resistors to V  
are built in  
CC  
MAX223  
__  
High Low  
High High  
__  
(except for the MAX220). The pull-up resistors force the  
outputs of unused drivers low because all drivers invert.  
The internal input pull-up resistors typically source ±2µA,  
except in shutdown mode where the pull-ups are dis-  
abled. Driver outputs turn off and enter a high-imped-  
ance state—where leakage current is typically  
microamperes (maximum 25µA)—when in shutdown  
Low  
High  
High Impedance  
Active  
MAX225  
__  
__  
__  
__  
__  
MAX235 Low  
MAX236 Low  
MAX240 High  
Low  
High  
X
High Impedance  
Active  
High Impedance  
14 ______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
nominal 5kvalues. The receivers implement Type ±  
Shutdown—MAX222–MAX242  
On the MAX222F MAX235F MAX236F MAX240F and  
MAX24±F all receivers are disabled during shutdown.  
On the MAX223 and MAX242F two receivers continue to  
operate in a reduced power mode when the chip is in  
shutdown. Under these conditionsF the propagation  
delay increases to about 2.5µs for a high-to-low input  
transition. When in shutdown, the receiver acts as a  
CMOS inverter with no hysteresis. The MAX223 and  
MAX242 also have a receiver output enable input (EN  
for the MAX242 and EN for the MAX223) that allows  
receiver output control independent of SHDN (SHDN  
for MAX24±). With all other devicesF SHDN (SHDN for  
MAX24±) also disables the receiver outputs.  
interpretation of the fault conditions of V.28 and  
EIA/TIA-232E.  
The receiver input hysteresis is typically 0.5V with a  
guaranteed minimum of 0.2V. This produces clear out-  
put transitions with slow-moving input signals, even  
with moderate amounts of noise and ringing. The  
receiver propagation delay is typically 600ns and is  
independent of input swing direction.  
Low-Power Receive Mode  
The low-power receive-mode feature of the MAX223,  
MAX242, and MAX245–MAX249 puts the IC into shut-  
down mode but still allows it to receive information. This  
is important for applications where systems are periodi-  
cally awakened to look for activity. Using low-power  
receive mode, the system can still receive a signal that  
will activate it on command and prepare it for communi-  
cation at faster data rates. This operation conserves  
system power.  
The MAX225 provides five transmitters and five  
receiversF while the MAX245 provides ten receivers and  
eight transmitters. Both devices have separate receiver  
and transmitter-enable controls. The charge pumps  
turn off and the devices shut down when a logic high is  
applied to the ENT input. In this state, the supply cur-  
rent drops to less than 25µA and the receivers continue  
to operate in a low-power receive mode. Driver outputs  
enter a high-impedance state (three-state mode). On  
the MAX225F all five receivers are controlled by the  
ENR input. On the MAX245F eight of the receiver out-  
puts are controlled by the ENR inputF while the remain-  
ing two receivers (RA5 and RB5) are always active.  
RA±–RA4 and RB±–RB4 are put in a three-state mode  
when ENR is a logic high.  
Negative Threshold—MAX243  
The MAX243 is pin compatible with the MAX232A, differ-  
ing only in that RS-232 cable fault protection is removed  
on one of the two receiver inputs. This means that control  
lines such as CTS and RTS can either be driven or left  
floating without interrupting communication. Different  
cables are not needed to interface with different pieces of  
equipment.  
The input threshold of the receiver without cable fault  
protection is -0.8V rather than +±.4V. Its output goes  
positive only if the input is connected to a control line  
that is actively driven negative. If not driven, it defaults  
to the 0 or “OK to send” state. NormallyF the MAX243’s  
other receiver (+±.4V threshold) is used for the data line  
(TD or RD)F while the negative threshold receiver is con-  
nected to the control line (DTRF DTSF CTSF RTS, etc.).  
Receiver and Transmitter Enable  
Control Inputs  
The MAX225 and MAX245–MAX249 feature transmitter  
and receiver enable controls.  
The receivers have three modes of operation: full-speed  
receive (normal active)F three-state (disabled)F and low-  
power receive (enabled receivers continue to function  
at lower data rates). The receiver enable inputs control  
the full-speed receive and three-state modes. The  
transmitters have two modes of operation: full-speed  
transmit (normal active) and three-state (disabled). The  
transmitter enable inputs also control the shutdown  
mode. The device enters shutdown mode when all  
transmitters are disabled. Enabled receivers function in  
the low-power receive mode when in shutdown.  
Other members of the RS-232 family implement the  
optional cable fault protection as specified by EIA/TIA-  
232E specifications. This means a receiver output goes  
high whenever its input is driven negativeF left floatingF  
or shorted to ground. The high output tells the serial  
communications IC to stop sending data. To avoid thisF  
the control lines must either be driven or connected  
with jumpers to an appropriate positive voltage level.  
______________________________________________________________________________________ 15  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
Tables ±a–±d define the control states. The MAX244  
has no control pins and is not included in these tables.  
The MAX249 provides ten receivers and six drivers with  
four control pins. The ENRA and ENRB receiver enable  
inputs each control five receiver outputs. The ENTA  
and ENTB transmitter enable inputs control three dri-  
vers each. There is no always-active receiver. The  
device enters shutdown mode and transmitters go into  
a three-state mode with a logic high on both ENTA and  
ENTB. In shutdown mode, active receivers operate in a  
low-power receive mode at data rates up to  
20kbits/sec.  
The MAX246 has ten receivers and eight drivers with  
two control pins, each controlling one side of the  
device. A logic high at the A-side control input (ENA)  
causes the four A-side receivers and drivers to go into  
a three-state mode. Similarly, the B-side control input  
(ENB) causes the four B-side drivers and receivers to  
go into a three-state mode. As in the MAX245, one A-  
side and one B-side receiver (RA5 and RB5) remain  
active at all times. The entire device is put into shut-  
down mode when both the A and B sides are disabled  
(ENA = ENB = +5V).  
__________Applications Information  
ꢁigures 5 through 25 show pin configurations and typi-  
cal operating circuits. In applications that are sensitive  
The MAX247 provides nine receivers and eight drivers  
with four control pins. The ENRA and ENRB receiver  
enable inputs each control four receiver outputs. The  
ENTA and ENTB transmitter enable inputs each control  
four drivers. The ninth receiver (RB5) is always active.  
The device enters shutdown mode with a logic high on  
both ENTA and ENTB.  
to power-supply noise, V  
ground with a capacitor of the same value as C± and  
C2 connected as close as possible to the device.  
should be decoupled to  
CC  
The MAX248 provides eight receivers and eight drivers  
with four control pins. The ENRA and ENRB receiver  
enable inputs each control four receiver outputs. The  
ENTA and ENTB transmitter enable inputs control four  
drivers each. This part does not have an always-active  
receiver. The device enters shutdown mode and trans-  
mitters go into a three-state mode with a logic high on  
both ENTA and ENTB.  
16 ______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
+5V INPUT  
C3  
TOP VIEW  
C5  
16  
V
1
CC  
2
C1+  
V+  
V
1
2
3
4
5
6
7
8
CC  
16  
15  
14  
13  
12  
11  
10  
9
C1+  
C1-  
+10V  
V+  
V-  
+5V TO +10V  
VOLTAGE DOUBLER  
C1  
C2  
3
4
GND  
T1  
6
-10V  
C4  
C2+  
C2-  
+10V TO -10V  
VOLTAGE INVERTER  
C1-  
OUT  
5
R1  
R1  
T1  
C2+  
C2-  
V-  
MAX220  
MAX232  
MAX232A  
IN  
+5V  
400k  
OUT  
T1  
T1  
11  
14  
IN  
OUT  
IN  
IN  
+5V  
TTL/CMOS  
INPUTS  
RS-232  
OUTPUTS  
T2  
T2  
R2  
OUT  
400k  
T2  
T2  
OUT  
7
R2  
10  
12  
OUT  
IN  
IN  
DIP/SO  
R1  
R2  
R1  
I
N
13  
OUT  
TTL/CMOS  
OUTPUTS  
RS-232  
INPUTS  
5k  
CAPACITANCE (µF)  
DEVICE  
MAX220  
MAX232  
C1 C2 C3 C4 C5  
4.7 4.7 10 10 4.7  
1.0 1.0 1.0 1.0 1.0  
8
9
R2  
OUT  
IN  
5k  
MAX232A 0.1 0.1 0.1 0.1 0.1  
GND  
15  
Figure 5. MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit  
+5V INPUT  
17  
C3  
TOP VIEW  
ALL CAPACITORS = 0.1µF  
C5  
V
2
CC  
3
7
+10V  
C1+  
+5V TO +10V  
V+  
V-  
C1  
4
5
(N.C.) EN  
C1+  
SHDN  
C1-  
VOLTAGE DOUBLER  
1
2
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
C2+  
C2-  
-10V  
C4  
(N.C.) EN  
C1+  
SHDN  
V
CC  
1
2
3
4
5
6
7
8
9
18  
17  
16  
15  
14  
13  
12  
11  
10  
+10V TO -10V  
VOLTAGE INVERTER  
C2  
6
V+  
V
CC  
GND  
3
+5V  
C1-  
V+  
GND  
T1  
4
OUT  
(EXCEPT MAX220)  
400k  
12 T1  
C1-  
MAX222  
MAX242  
C2+  
C2-  
V-  
T1  
N.C.  
5
OUT  
T1  
15  
IN  
+5V  
400k  
OUT  
MAX222  
MAX242  
C2+  
C2-  
V-  
R1  
IN  
R1  
IN  
6
TTL/CMOS  
INPUTS  
RS-232  
(EXCEPT MAX220)  
R1  
OUTPUTS  
R1  
7
OUT  
OUT  
11 T2  
T2  
8
IN  
OUT  
T2  
OUT  
T1  
IN  
N.C.  
8
T2  
R2  
IN  
OUT  
T1  
IN  
T2  
IN  
9
13 R1  
R1  
IN  
14  
OUT  
R2  
IN  
R2  
R2  
T2  
IN  
OUT  
10  
OUT  
TTL/CMOS  
OUTPUTS  
RS-232  
INPUTS  
5k  
5k  
10  
1
R2  
R2  
IN  
9
OUT  
DIP/SO  
SSOP  
(N.C.)  
EN  
18  
( ) ARE FOR MAX222 ONLY.  
PIN NUMBERS IN TYPICAL OPERATING CIRCUIT ARE FOR DIP/SO PACKAGES ONLY.  
SHDN  
GND  
16  
Figure 6. MAX222/MAX242 Pin Configurations and Typical Operating Circuit  
______________________________________________________________________________________ 17  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
+5V  
TOP VIEW  
0.1  
28  
CC  
27  
V
CC  
+5V  
V
400k  
T IN  
1
3
4
11  
12  
18  
17  
T OUT  
1
+5V  
ENR  
ENR  
V
1
2
28 CC  
400k  
V
27 CC  
T IN  
2
T IN  
1
ENT  
26  
3
T OUT  
2
+5V  
T IN  
2
T IN  
4
25  
24  
400k  
400k  
400k  
3
T IN  
3
MAX225  
R OUT  
1
T IN  
4
5
25  
24  
T OUT  
3
+5V  
+5V  
R OUT  
2
23 T IN  
6
5
R OUT  
3
R OUT  
22  
7
4
T IN  
4
R IN  
3
T OUT  
4
21 R OUT  
5
8
R IN  
2
R IN  
9
20  
19  
18  
17  
5
T OUT  
5
T IN  
5
R IN  
1
R IN  
4
10  
11  
12  
13  
14  
23  
26  
16  
15  
T OUT  
1
T OUT  
3
ENT  
T OUT  
2
T OUT  
5
T OUT  
4
R OUT  
1
R IN  
1
GND  
GND  
T OUT  
5
16  
15  
5
10  
T OUT  
5
5k  
R OUT  
R IN  
2
2
SO  
6
7
9
8
5k  
5k  
R OUT  
3
R IN  
3
MAX225 FUNCTIONAL DESCRIPTION  
5 RECEIVERS  
5 TRANSMITTERS  
2 CONTROL PINS  
1 RECEIVER ENABLE (ENR)  
1 TRANSMITTER ENABLE (ENT)  
R OUT  
R IN  
4
4
22  
21  
19  
20  
5k  
5k  
R OUT  
5
R IN  
5
ENR  
ENR  
1
2
PINS (ENR, GND, V , T OUT) ARE INTERNALLY CONNECTED.  
GND  
14  
CC  
5
GND  
13  
CONNECT EITHER OR BOTH EXTERNALLY. T OUT IS A SINGLE DRIVER.  
5
Figure 7. MAX225 Pin Configuration and Typical Operating Circuit  
18 ______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
+5V INPUT  
TOP VIEW  
1.0µF  
11  
1.0µF  
1.0µF  
12  
V
C1+  
CC  
13  
17  
V+  
V-  
+5V TO +10V  
VOLTAGE DOUBLER  
1.0µF  
1.0µF  
14  
15  
C1-  
C2+  
+10V TO -10V  
VOLTAGE INVERTER  
16  
C2-  
+5V  
400k  
T1  
T1  
T2  
T1  
7
2
3
1
OUT  
IN  
T3  
1
2
3
4
5
6
7
8
9
28 T4  
27 R3  
26 R3  
+5V  
+5V  
OUT  
OUT  
OUT  
OUT  
400k  
T1  
T2  
IN  
6
T2  
T3  
OUT  
IN  
IN  
T2  
OUT  
R2  
25 SHDN (SHDN)  
24 EN (EN)  
RS-232  
OUTPUTS  
IN  
TTL/CMOS  
INPUTS  
400k  
R2  
OUT  
T3  
OUT  
20  
MAX223  
MAX241  
T3  
T2  
23 R4  
22 R4  
IN  
IN  
IN*  
OUT*  
IN  
T1  
+5V  
400k  
T4  
R1  
21 T4  
20 T3  
19 R5  
18 R5  
17 V-  
OUT  
T4  
T4  
R1  
21  
8
28  
9
OUT  
IN  
R1  
IN  
IN  
GND 10  
11  
OUT*  
IN*  
R1  
IN  
IN  
OUT  
R1  
R2  
V
CC  
5k  
5k  
5k  
5k  
5k  
C1+ 12  
V+ 13  
16 C2-  
15 C2+  
R2  
R3  
R2  
5
4
OUT  
C1- 14  
Wide SO/  
SSOP  
26  
R3  
27  
23  
RS-232  
INPUTS  
OUT  
OUT  
OUT  
IN  
LOGIC  
OUTPUTS  
R3  
R4  
R5  
22 R4  
R4  
R5  
IN  
R5  
19  
24  
18  
25  
IN  
*R4 AND R5 IN MAX223 REMAIN ACTIVE IN SHUTDOWN  
SHDN  
(SHDN)  
NOTE: PIN LABELS IN ( ) ARE FOR MAX241  
EN (EN)  
GND  
10  
Figure 8. MAX223/MAX241 Pin Configuration and Typical Operating Circuit  
______________________________________________________________________________________ 19  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
+5V INPUT  
TOP VIEW  
1.0µF  
7
1.0µF  
1.0µF  
8
V
9
CC  
C1+  
C1-  
V+  
V-  
+5V TO +10V  
10  
1.0µF  
1.0µF  
VOLTAGE DOUBLER  
T3  
T4  
T5  
OUT  
1
2
OUT  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
11  
12  
C2+  
C2-  
+10V TO -10V  
VOLTAGE INVERTER  
13  
T1  
T2  
OUT  
IN  
OUT  
N.C.  
+5V  
3
400k  
400k  
T2  
IN  
SHDN  
4
5 T1  
T1  
T2  
T3  
T4  
T5  
2
IN  
IN  
OUT  
OUT  
OUT  
1 T  
T1  
MAX230  
T1  
T5  
IN  
5
+5V  
+5V  
+5V  
OUT  
GND  
T4  
IN  
6
T2  
4
14  
15  
3
1
T2  
T3  
T4  
T5  
V
T3  
IN  
CC  
7
400k  
400k  
400k  
C1+  
V+  
V-  
8
T3  
T4  
TTL/CMOS  
INPUTS  
RS-232  
OUTPUTS  
IN  
IN  
C2-  
C2+  
9
C1-  
10  
OUT 20  
+5V  
DIP/SO  
T5  
19  
18  
16  
17  
OUT  
IN  
N.C.x  
SHDN  
GND  
6
Figure 9. MAX230 Pin Configuration and Typical Operating Circuit  
+5V INPUT  
TOP VIEW  
+7.5V TO +12V  
1.0µF  
13 (15)  
1
2
14  
3
(16)  
V
CC  
C1+  
C1-  
V+  
V-  
+12V TO -12V  
VOLTAGE CONVERTER  
1.0µF  
C2  
1.0µF  
+5V  
C+  
V+  
V
1
2
3
4
5
6
7
8
C+  
C-  
V-  
1
2
3
4
5
6
7
14 V+  
13  
16  
400k  
T1  
(10)  
(11)  
(13)  
(12)  
C-  
V-  
V
15 CC  
CC  
T1  
T2  
11  
T1  
OUT  
8
IN  
GND  
14  
12 GND  
11 T1  
+5V  
TTL/CMOS  
INPUTS  
RS-232  
OUTPUTS  
T1  
13  
T2  
R2  
MAX231  
T2  
R2  
MAX231  
OUT  
OUT  
OUT  
OUT  
400k  
T2  
R1  
R1  
T1  
R2  
R2  
10 R1  
12  
11  
10  
9
IN  
IN  
4
IN  
IN  
T2  
IN  
7
OUT  
9
8
R1  
T1  
OUT  
OUT  
OUT  
OUT  
R1  
10  
R1  
9
OUT  
IN  
R1  
T2  
IN  
T2  
IN  
IN  
IN  
TTL/CMOS  
INPUTS  
N.C.  
5k  
RS-232  
INPUTS  
N.C.  
DIP  
R2  
R2  
5
SO  
OUT  
6
IN  
R2  
5k  
GND  
PIN NUMBERS IN ( ) ARE FOR SO PACKAGE  
12 (14)  
Figure 10. MAX231 Pin Configurations and Typical Operating Circuit  
20 ______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
+5V INPUT  
1.0µF  
TOP VIEW  
7
V
+5V  
+5V  
CC  
400k  
400k  
T1  
T2  
5
T1  
OUT  
OUT  
2
1
IN  
T2  
R2  
R2  
IN  
1
2
OUT  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
T1  
TTL/CMOS  
INPUTS  
IN  
IN  
RS-232  
OUTPUTS  
R1  
T1  
OUT  
T2  
V-  
3
OUT  
18  
4
T2  
IN  
R1  
IN  
4
R1  
OUT  
R1  
IN  
3
MAX233  
C2-  
OUT  
5
MAX233A  
5k  
5k  
GND  
TTL/CMOS  
OUTPUTS  
C2+  
6
RS-232  
OUTPUTS  
V
V+ (C1-)  
C1- (C1+)  
V- (C2+)  
C2+ (C2-)  
CC  
7
R2  
R2 19  
OUT  
20  
IN  
(V+) C1+  
GND  
8
8 (13)  
11 (12)  
9
C1+  
DO NOT MAKE  
CONNECTIONS TO  
THESE PINS  
C2+  
13 (14)  
12 (10)  
15  
16  
(V-) CS-  
10  
C1-  
V-  
C2+  
C2-  
INTERNAL -10  
POWER SUPPLY  
17  
10 (11)  
DIP/SO  
V-  
C2-  
14 (8)  
INTERNAL +10V  
POWER SUPPLY  
V+  
GND  
6
GND  
9
( ) ARE FOR SO PACKAGE ONLY.  
Figure 11. MAX233/MAX233A Pin Configuration and Typical Operating Circuit  
+5V INPUT  
6
1.0µF  
TOP VIEW  
1.0µF  
7
V
CC  
8
C1+  
+5V TO +10V  
V+  
V-  
1.0µF  
1.0µF  
9
VOLTAGE DOUBLER  
C1-  
C2+  
10  
+10V TO -10V  
VOLTAGE INVERTER  
12  
11  
T1  
T2  
T3  
T4  
T4  
T3  
V-  
C2-  
OUT  
OUT  
1
2
3
4
5
6
7
8
1.0µF  
OUT  
OUT  
IN  
16  
15  
14  
13  
12  
11  
10  
9
+5V  
400k  
400k  
400k  
400k  
T2  
IN  
IN  
T1  
T1  
4
1
OUT  
IN  
T1  
T1  
MAX234  
IN  
+5V  
GND  
T2  
IN  
T3  
IN  
IN  
T2  
T3  
3
3
V
OUT  
C2-  
C2+  
C1-  
CC  
T2  
T3  
T4  
+5V  
+5V  
RS-232  
OUTPUTS  
C1+  
V+  
TTL/CMOS  
INPUTS  
13  
16  
15  
OUT  
DIP/SO  
14 T4  
T4  
OUT  
GND  
5
Figure 12. MAX234 Pin Configuration and Typical Operating Circuit  
______________________________________________________________________________________ 21  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
+5V INPUT  
TOP VIEW  
1.0µF  
12  
V
CC  
+5V  
400k  
T1  
T1  
8
3
OUT  
IN  
T1  
+5V  
+5V  
+5V  
+5V  
400k  
400k  
400k  
400k  
T2  
T2  
T3  
T4  
OUT  
7
15  
16  
4
IN  
IN  
IN  
IN  
T2  
T3  
T4  
T3  
2
1
TTL/CMOS  
INPUTS  
OUT  
RS-232  
OUTPUTS  
T4  
T3  
T1  
T2  
1
2
3
4
5
6
7
8
9
24 R3  
23 R3  
OUT  
OUT  
OUT  
OUT  
IN  
OUT  
IN  
T4  
OUT  
OUT  
22 T5  
21 SHDN  
20 EN  
MAX235  
R2  
IN  
T5  
22 T5  
19  
10  
T5  
T1  
R2  
19 T5  
18 R4  
17 R4  
OUT  
OUT  
IN  
T2  
IN  
IN  
R1  
9
R1  
IN  
IN  
OUT  
T1  
OUT  
IN  
5k  
R1  
16 T4  
15 T3  
14 R5  
13 R5  
OUT  
R1 10  
IN  
IN  
R2  
5
R2  
R3  
R4  
6
OUT  
OUT  
OUT  
OUT  
R2  
GND 11  
OUT  
IN  
5k  
5k  
5k  
5k  
V
12  
CC  
23  
R3 24  
IN  
TTL/CMOS  
OUTPUTS  
RS-232  
INPUTS  
R3  
R4  
DIP  
18  
17  
R4  
IN  
R5  
EN  
13  
14  
20  
R5  
IN  
R5  
21  
SHDN  
GND  
11  
Figure 13. MAX235 Pin Configuration and Typical Operating Circuit  
22 ______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
TOP VIEW  
+5V INPUT  
1.0µF  
9
1.0µF  
1.0µF  
10  
11  
15  
C1+  
V
CC  
V+  
V-  
+5V TO +10V  
VOLTAGE DOUBLER  
1.0µF  
1.0µF  
12  
13  
C1-  
C2+  
+10V TO -10V  
VOLTAGE INVERTER  
14  
C2-  
+5V  
400k  
T1  
T1  
T1  
7
2
OUT  
IN  
T3  
T1  
T2  
1
2
3
4
5
6
7
8
9
24 T4  
23 R2  
22 R2  
OUT  
OUT  
OUT  
OUT  
+5V  
+5V  
+5V  
400k  
T2  
IN  
T2  
T2  
T3  
OUT  
6
3
1
IN  
IN  
IN  
OUT  
TTL/CMOS  
INPUTS  
R1  
21 SHDN  
20 EN  
RS-232  
OUTPUTS  
IN  
400k  
T3  
MAX236  
R1  
OUT  
T3  
T4  
18  
OUT  
T2  
19 T4  
18 T3  
IN  
IN  
IN  
IN  
T1  
400k  
T4  
GND  
17 R3  
16 R3  
15 V-  
OUT  
IN  
24  
4
19 T4  
OUT  
V
CC  
C1+ 10  
V+ 11  
14 C2-  
13 C2+  
R1  
5
R1  
IN  
OUT  
OUT  
OUT  
R1  
C1- 12  
5k  
5k  
5k  
DIP/SO  
22  
23  
R2  
R2  
IN  
RS-232  
INPUTS  
TTL/CMOS  
OUTPUTS  
R2  
R3  
R3  
R3  
16  
21  
17  
20  
IN  
EN  
SHDN  
GND  
8
Figure 14. MAX236 Pin Configuration and Typical Operating Circuit  
______________________________________________________________________________________ 23  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
TOP VIEW  
+5V INPUT  
1.0µF  
1.0µF  
1.0µF  
9
10  
V
11  
15  
CC  
C1+  
V+  
V-  
+5V TO +10V  
VOLTAGE DOUBLER  
1.0µF  
1.0µF  
12  
13  
C1-  
C2+  
+10V TO -10V  
VOLTAGE INVERTER  
14  
C2-  
+5V  
+5V  
+5V  
+5V  
+5V  
400k  
T1  
T3  
T1  
T2  
1
2
3
4
5
6
7
8
9
24 T4  
23 R2  
22 R2  
T1  
T1  
7
2
OUT  
OUT  
OUT  
OUT  
OUT  
IN  
IN  
400k  
OUT  
IN  
T2  
T2  
T3  
OUT  
6
3
1
IN  
IN  
T2  
R1  
21 T5  
20 T5  
19 T4  
18 T3  
17 R3  
16 R3  
15 V-  
IN  
MAX237  
R1  
OUT  
OUT  
IN  
400k  
T2  
IN  
IN  
T3  
OUT  
18  
TTL/CMOS  
INPUTS  
RS-232  
T3  
OUTPUTS  
T1  
IN  
400k  
GND  
OUT  
IN  
T4  
T5  
24  
20  
4
19 T4  
21 T5  
OUT  
IN  
V
T4  
CC  
C1+ 10  
V+ 11  
400k  
14 C2-  
13 C2+  
OUT  
IN  
T5  
C1- 12  
DIP/SO  
5
R1  
R1  
IN  
OUT  
OUT  
OUT  
R1  
5k  
22  
R2  
R3  
R2  
R3  
23  
16  
IN  
RS-232  
INPUTS  
TTL/CMOS  
OUTPUTS  
R2  
R3  
5k  
5k  
17  
IN  
GND  
8
Figure 15. MAX237 Pin Configuration and Typical Operating Circuit  
24 ______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
TOP VIEW  
+5V INPUT  
1.0µF  
9
1.0µF  
1.0µF  
10  
V
11  
15  
CC  
C1+  
V+  
V-  
+5V TO +10V  
VOLTAGE DOUBLER  
1.0µF  
1.0µF  
12  
13  
C1-  
C2+  
+10V TO -10V  
VOLTAGE INVERTER  
14  
C2-  
+5V  
+5V  
400k  
T1  
T1  
5
18  
19  
2
T2  
T1  
1
2
3
4
5
6
7
8
9
24 T3  
23 R3  
22 R3  
OUT  
IN  
OUT  
OUT  
OUT  
T1  
IN  
400k  
R2  
IN  
OUT  
IN  
T2  
T2  
T3  
OUT  
1
IN  
IN  
IN  
T2  
R2  
R1  
21 T4  
20 T4  
19 T3  
18 T2  
17 R4  
16 R4  
15 V-  
OUT  
+5V  
+5V  
TTL/CMOS  
INPUTS  
400k  
RS-232  
OUTPUTS  
MAX238  
T1  
IN  
OUT  
IN  
T3  
24  
OUT  
OUT  
T3  
R1  
IN  
IN  
400k  
GND  
OUT  
IN  
T4  
20  
7
21 T4  
OUT  
T4  
R1  
V
CC  
C1+ 10  
V+ 11  
R1  
14 C2-  
13 C2+  
6
4
R1  
IN  
OUT  
C1- 12  
5k  
5k  
DIP/SO  
R2  
3
R2  
OUT  
IN  
R2  
TTL/CMOS  
OUTPUTS  
RS-232  
INPUTS  
R3  
R4  
R3  
R4  
23  
16  
22  
17  
OUT  
OUT  
IN  
IN  
R3  
R4  
5k  
5k  
GND  
8
Figure 16. MAX238 Pin Configuration and Typical Operating Circuit  
______________________________________________________________________________________ 25  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
TOP VIEW  
7.5V TO 13.2V  
INPUT  
+5V INPUT  
1.0µF  
4
5
V
V+  
CC  
6
8
C1+  
V-  
+10V TO -10V  
VOLTAGE INVERTER  
1.0µF  
7
1.0µF  
C1-  
+5V  
+5V  
400k  
400k  
T1  
T1  
24  
23  
19  
20  
OUT  
IN  
T1  
T2  
R1  
1
2
24 T1  
23 T2  
OUT  
IN  
IN  
R1  
IN  
T2  
T2  
T3  
OUT  
IN  
TTL/CMOS  
INPUTS  
RS-232  
OUTPUTS  
GND  
3
22 R2  
21 R2  
20 T2  
19 T1  
18 R3  
17 R3  
OUT  
IN  
V
4
+5V  
CC  
400k  
MAX239  
V+  
C+  
C-  
V-  
5
OUT  
OUT  
IN  
T3  
OUT  
13  
2
16  
1
IN  
T3  
R1  
6
7
8
OUT  
IN  
R1  
R1  
IN  
IN  
OUT  
R5  
9
16 T3  
IN  
5k  
R5  
R4  
10  
11  
15 N.C.  
14 EN  
OUT  
OUT  
R2  
22 R2  
21  
18  
12  
OUT  
OUT  
R2  
R3  
R4 12  
13 T3  
OUT  
IN  
5k  
5k  
DIP/SO  
17  
R3  
R3  
IN  
RS-232  
INPUTS  
TTL/CMOS  
OUTPUTS  
11 R4  
R4  
R5  
OUT  
OUT  
IN  
IN  
R4  
R5  
5k  
5k  
R5  
EN  
10  
14  
9
15  
N.C.  
GND  
3
Figure 17. MAX239 Pin Configuration and Typical Operating Circuit  
26 ______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
+5V INPUT  
TOP VIEW  
1.0µF  
19  
1.0µF  
1.0µF  
25  
V
C1+  
CC  
26  
30  
V+  
V-  
+5V TO +10V  
VOLTAGE DOUBLER  
1.0µF  
1.0µF  
27  
28  
C1-  
C2+  
+5V TO -10V  
VOLTAGE INVERTER  
29  
C2-  
+5V  
400k  
T1  
T1  
15  
7
OUT  
IN  
T1  
+5V  
400k  
T2  
14 T2  
OUT  
8
6
5
IN  
T2  
+5V  
400k  
T3  
T3  
T4  
RS-232  
OUTPUTS  
37  
38  
OUT  
TTL/CMOS  
INPUTS  
IN  
T3  
+5V  
400k  
T4  
N.C.  
R2  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
44  
43  
42  
41  
40  
39  
38  
37  
36  
35  
34  
N.C.  
SHDN  
EN  
OUT  
IN  
T4  
OUT  
+5V  
T2  
400k  
IN  
IN  
T1  
R1  
T5  
OUT  
T5  
T5  
2
41  
IN  
OUT  
R1  
R4  
R4  
OUT  
IN  
T5  
R1  
R1  
IN  
OUT  
IN  
MAX240  
GND  
T4  
T3  
16 R1  
IN 17  
OUT  
OUT  
V
CC  
IN  
5k  
N.C.  
N.C.  
N.C.  
R5  
R5  
OUT  
IN  
N.C.  
R2  
R3  
13 R2  
IN  
10  
4
R2  
5k  
5k  
3
R3  
RS-232  
INPUTS  
OUT  
OUT  
OUT  
IN  
TTL/CMOS  
OUTPUTS  
R3  
R4  
R5  
Plastic FP  
39 R4  
R4  
R5  
40  
IN  
5k  
5k  
R5  
36  
35  
43  
IN  
42 EN  
SHDN  
GND  
18  
Figure 18. MAX240 Pin Configuration and Typical Operating Circuit  
______________________________________________________________________________________ 27  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
+5V INPUT  
16  
ALL CAPACITORS = 0.1µF  
0.1µF  
TOP VIEW  
0.1µF  
1
V
CC  
C1+  
2
6
+10V  
-10V  
+5V TO +10V  
VOLTAGE DOUBLER  
V+  
V-  
0.1µF  
0.1µF  
3
4
C1-  
C2+  
C1+  
V+  
1
2
3
4
5
6
7
8
16  
V
CC  
+10V TO -10V  
VOLTAGE INVERTER  
5
C2-  
15 GND  
0.1µF  
+5V  
400k  
C1-  
C2+  
C2-  
V-  
14 T1  
13 R1  
12 R1  
OUT  
MAX243  
IN  
T1  
IN  
T1  
T2  
11  
14  
OUT  
OUT  
OUT  
IN  
+5V  
400k  
11 T1  
10 T2  
TTL/CMOS  
INPUTS  
RS-232  
OUTPUTS  
T2  
OUT  
IN  
T2  
IN  
7
10  
12  
R2  
9
R2  
OUT  
IN  
DIP/SO  
R1  
R1  
13  
OUT  
IN  
IN  
TTL/CMOS  
OUTPUTS  
RS-232  
INPUTS  
5k  
5k  
R2  
8
9
R2  
OUT  
RECEIVER INPUT R1 OUTPUT R2 OUTPUT  
-3 V  
OPEN  
+3V  
HIGH  
HIGH  
LOW  
HIGH  
LOW  
LOW  
GND  
15  
Figure 19. MAX243 Pin Configuration and Typical Operating Circuit  
28 ______________________________________________________________________________________  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
+5V  
1µF  
TOP VIEW  
1µF  
20  
21  
V
22  
C1+  
C1-  
CC  
1µF  
1µF  
23  
24  
V+  
V-  
+5V TO +10V VOLTAGE DOUBLER  
26  
C2+  
C2-  
1µF  
25  
+10V TO -10V VOLTAGE INVERTER  
43  
42 41 40  
6
5
4
3
2
1
44  
+5V  
+5V  
+5V  
+5V  
2 T OUT  
T
OUT 44  
A1  
B1  
400k  
400k  
15 T IN  
T
IN 30  
B1  
A1  
R
R
R
IN  
IN  
IN  
7
8
9
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
R
R
R
R
R
R
R
R
R
IN  
A3  
A2  
A1  
B4  
B3  
B2  
B1  
B1  
B2  
B3  
B4  
B5  
IN  
2 T OUT  
A2  
T
OUT 43  
B2  
IN  
R
R
R
R
R
OUT 10  
OUT 11  
OUT 12  
OUT 13  
OUT 14  
IN  
A1  
A2  
A3  
A4  
16 T IN  
A2  
T
IN 29  
B2  
OUT  
OUT  
OUT  
OUT  
OUT  
MAX244  
+5V  
+5V  
+5V  
+5V  
3 T OUT  
A3  
T
T
OUT 42  
B3  
400k  
400k  
17 T IN  
T
IN 28  
B3  
A3  
A5  
T
IN 15  
IN 16  
IN 17  
A1  
A2  
A3  
4 T OUT  
A4  
OUT 41  
B4  
T
T
T
T
IN  
IN  
B1  
B2  
18 T IN  
T
IN 27  
IN 36  
A4  
B4  
9 R IN  
R
A1  
B1  
18 19 20 21 22 23 24 25 26 27 28  
5k  
5k  
5k  
5k  
5k  
5k  
PLCC  
10 R OUT  
R
OUT 35  
A1  
B1  
8 R IN  
R
IN 37  
B2  
A2  
5k  
MAX249 FUNCTIONAL DESCRIPTION  
10 RECEIVERS  
11 R OUT  
R
OUT 34  
B2  
A2  
5 A-SIDE RECEIVER  
5 B-SIDE RECEIVER  
7 R IN  
A3  
R
IN 38  
B3  
8 TRANSMITTERS  
5k  
4 A-SIDE TRANSMITTERS  
4 B-SIDE TRANSMITTERS  
NO CONTROL PINS  
12 R OUT  
A3  
R
OUT 33  
B3  
6 R IN  
A4  
R
IN 39  
B4  
5k  
13 R OUT  
R
OUT 32  
B4  
A4  
5 R IN  
R
IN 40  
B5  
A5  
5k  
14 R OUT  
R
OUT 31  
B5  
A5  
GND  
19  
Figure 20. MAX244 Pin Configuration and Typical Operating Circuit  
______________________________________________________________________________________ 29  
+5V-Powered, Multichannel RS-232  
Drivers/Receivers  
+5V  
TOP VIEW  
1µF  
40  
V
CC  
+5V  
+5V  
+5V  
+5V  
16 T OUT  
T
T
OUT 24  
A1  
B1  
T
ENR  
1
2
3
4
5
6
7
8
9
40  
V
CC  
400k  
T
T
T
IN  
A1