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X40421S14-B 参数 Datasheet PDF下载

X40421S14-B图片预览
型号: X40421S14-B
PDF下载: 下载PDF文件 查看货源
内容描述: 双电压监控器,集成了CPU监控系统和电池开关 [Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch]
分类和应用: 电池开关光电二极管监控输入元件
文件页数/大小: 25 页 / 149 K
品牌: XICOR [ XICOR INC. ]
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New Features
Monitor Voltages: 5V to 1.6V
Memory Security
Battery Switch Backup
V
OUT
5mA to 50mA
Preliminary Datasheet
4kbit EEPROM
X40420/X40421
APPLICATIONS
• Communications Equipment
—Routers, Hubs, Switches
—Disk arrays
• Industrial Systems
—Process Control
—Intelligent Instrumentation
• Computer Systems
—Desktop Computers
—Network Servers
X40420/21
Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch
FEATURES
• Dual voltage detection and reset assertion
—Three standard reset threshold settings
(4.6V/2.9V, 4.6V/2.6V, 2.9V/1.6V)
—V
TRIP2
Programmable down to 0.9V
—Adjust low voltage reset threshold voltages
using special programming sequence
—Reset signal valid to V
CC
= 1V
—Monitor two voltages or detect power fail
• Battery Switch Backup
• V
OUT
: 5mA to 50mA from V
CC
; or 250µA from
V
BATT
• Fault detection register
• Selectable power on reset timeout
(0.05s, 0.2s, 0.4s, 0.8s)
• Selectable watchdog timer interval
(25ms, 200ms, 1.4s, off)
• Debounced manual reset input
• Low power CMOS
—25µA typical standby current, watchdog on
—6µA typical standby current, watchdog off
—1µA typical battery current in backup mode
• 4Kbits of EEPROM
—16 byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Block lock protect 0 or 1/2, of EEPROM
• 400kHz 2-wire interface
• 2.7V to 5.5V power supply operation
• Available packages
—14-lead SOIC, TSSOP
EL
I
M
BLOCK DIAGRAM
V2MON
PR
IN
A
DESCRIPTION
V
OUT
+
V2 Monitor
Logic
V
TRIP2
Standard V
TRIP1
Level Standard V
TRIP2
Level Suffix
4.6V (+/-1%)
2.9V(+/-1.7%)
-A
4.6V (+/-1%)
2.6V (+/-2%)
-B
2.9V(+/-1.7%)
1.6V (+/-3%)
-C
See “Ordering Information” for more details
For Custom Settings, call Xicor.
The X40420/21 combines power-on reset control,
watchdog timer, supply voltage supervision, and sec-
ondary supervision, manual reset, and Block Lock
protect serial EEPROM in one package. This combina-
tion lowers system cost, reduces board space require-
ments, and increases reliability.
Applying voltage to V
CC
activates the power on reset
circuit which holds RESET/RESET active for a period of
time. This allows the power supply and system oscillator
to stabilize before the processor can execute code.
R
Y
V
OUT
V2FAIL
-
SDA
WP
Data
Register
Command
Decode Test
& Control
Logic
Fault Detection
Register
Status
Register
EEPROM
Array
Watchdog
and
Reset Logic
WDO
MR
RESET
X40420
SCL
V
OUT
V
CC
(V1MON)
+
V
CC
Monitor
Logic
System
Battery
Switch
V
TRIP1
-
Power on,
Manual Reset
Low Voltage
Reset
Generation
RESET
X40421
BATT-ON
V
OUT
V
BATT
LOWLINE
REV 1.2.14 7/12/02
www.xicor.com
Characteristics subject to change without notice.
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