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    • 北京元坤伟业科技有限公司

           该会员已使用本站17年以上

    • DS1832S+T&R
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    • QQ:857273081QQ：857273081 复制
      QQ:1594462451QQ：1594462451 复制
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    产品型号DS1832S+T&R的Datasheet PDF文件预览

    DS1832  
    3.3-Volt MicroMonitor Chip  
    www.dalsemi.com  
    FEATURES  
    PIN ASSIGNMENT  
    ꢀ Halts and restarts an out-of-control  
    microprocessor  
    VCC  
    PBRST  
    1
    2
    3
    4
    8
    7
    6
    5
    TD  
    ST  
    ꢀ Holds microprocessor in check during power  
    transients  
    ꢀ Automatically restarts microprocessor after  
    power failure  
    TOL  
    RST  
    RST  
    GND  
    DS1832 8-Pin DIP (300-mil)  
    See Mech. Drawings Section  
    ꢀ Monitors pushbutton for external override  
    ꢀ Accurate 10% or 20% microprocessor power  
    monitoring  
    ꢀ Eliminates need for discrete components  
    ꢀ 20% tolerance for use with 3.0-volt systems  
    ꢀ Pin-compatible with the DS1232  
    ꢀ Low cost 8-pin DIP, 8-pin SOIC, and space  
    saving µ-SOP packages available  
    ꢀ Industrial temperature range of -40°C to  
    +85°C  
    VCC  
    1
    2
    3
    4
    8
    7
    6
    5
    PBRST  
    TD  
    ST  
    TOL  
    RST  
    RST  
    GND  
    DS1832S 8-Pin SOIC (150-mil)  
    See Mech. Drawings Section  
    PBRST  
    TD  
    TOL  
    GND  
    VCC  
    1
    2
    3
    4
    8
    7
    6
    5
    ST  
    RST  
    RST  
    DS1832µ 8-Pin µ-SOP (118-mil)  
    See Mech. Drawings Section  
    PIN DESCRIPTION  
    PBRST  
    TD  
    - Pushbutton Reset Input  
    - Time Delay Set  
    TOL  
    GND  
    RST  
    - Selects 10% or 20% VCC Detect  
    - Ground  
    - Active High Reset Output  
    RST  
    - Active Low Reset Output  
    ST  
    - Strobe Input  
    VCC  
    - Power Supply  
    DESCRIPTION  
    The DS1832 3.3-Volt MicroMonitor monitors three vital conditions for a microprocessor: power supply,  
    software execution, and external override. First, a precision temperature-compensated reference and  
    comparator circuit monitor the status of VCC. When an out-of-tolerance condition occurs, an internal  
    power-fail signal is generated which forces the resets to an active state. When VCC returns to an  
    in-tolerance condition, the reset signals are kept in the active state for a minimum of 250 ms to allow the  
    power supply and processor to stabilize.  
    1 of 7  
    112099  
    DS1832  
    The second function the DS1832 performs is pushbutton reset control. The DS1832 debounces the  
    pushbutton input and guarantees an active reset pulse width of 250 ms minimum. The third function is a  
    watchdog timer. The DS1832 has an internal timer that forces the reset signals to the active state if the  
    strobe input is not driven low prior to timeout. The watchdog timer function can be set to operate on  
    timeout settings of approximately 150 ms, 600 ms, or 1.2 seconds.  
    OPERATION - POWER MONITOR  
    The DS1832 detects out-of-tolerance power supply conditions and warns a processor-based system of  
    impending power failure. When VCC falls below a preset level as defined by TOL, the VCC comparator  
    outputs the signals RST and RST . When TOL is connected to ground, the RST and RST signals become  
    active as VCC falls below 2.98 volts. When TOL is connected to VCC, the RST and RST signals become  
    active as VCC falls below 2.64 volts. The RST and RST are excellent control signals for a microprocessor,  
    as processing is stopped at the last possible moments of valid VCC. On power-up, RST and RST are kept  
    active for a minimum of 250 ms to allow the power supply and processor to stabilize.  
    OPERATION - PUSHBUTTON RESET  
    The DS1832 provides an input pin for direct connection to a pushbutton reset (see Figure 2). The  
    pushbutton reset input requires an active low signal. Internally, this input is debounced and timed such  
    that RST and RST signals of at least 250 ms minimum are generated. The 250 ms delay commences as  
    the pushbutton reset input is released from the low level.  
    OPERATION - WATCHDOG TIMER  
    The watchdog timer function forces RST and RST signals active when the ST input is not clocked within  
    the predetermined time period. The timeout period is determined by the condition of the TD pin. If TD is  
    connected to ground the minimum watchdog timeout would be 62.5 ms, TD floating would yield a  
    minimum timeout of 250 ms, and TD connected to VCC would provide a timeout of 500 ms minimum.  
    Timeout of the watchdog starts when RST and RST become inactive. If a high-to-low transition occurs  
    on the ST input pin prior to timeout, the watchdog timer is reset and begins to timeout again. If the  
    watchdog timer is allowed to timeout, then the RST and RST signals are driven active for a minimum of  
    250 ms. The ST input can be derived from many microprocessor outputs. The most typical signals used  
    are the microprocessor address signals, data signals or control signals. When the microprocessor  
    functions normally, these signals would, as a matter of routine, cause the watchdog to be reset prior to  
    timeout. To guarantee that the watchdog timer does not timeout, a high-to-low transition must occur at or  
    less than the minimum times shown in Table 1. A typical circuit example is shown in Figure 4.  
    The DS1832 watchdog function cannot be disabled. The watchdog strobe input must be strobed to avoid  
    a watchdog timeout and reset.  
    2 of 7  
    DS1832  
    MICROMONITOR BLOCK DIAGRAM Figure 1  
    PUSHBUTTON RESET Figure 2  
    TIMING DIAGRAM: PUSHBUTTON RESET Figure 3  
    3 of 7  
    DS1832  
    WATCHDOG TIMER Figure 4  
    WATCHDOG TIMEOUTS Table 1  
    TIMEOUT  
    TYP  
    TD  
    GND  
    Float  
    VCC  
    MIN  
    MAX  
    250 ms  
    1000 ms  
    2000 ms  
    62.5 ms  
    250 ms  
    500 ms  
    150 ms  
    600 ms  
    1200 ms  
    TIMING DIAGRAM: STROBE INPUT Figure 5  
    TIMING DIAGRAM: POWER DOWN Figure 6  
    4 of 7  
    DS1832  
    TIMING DIAGRAM: POWER-UP Figure 7  
    RST VALID TO 0 VOLTS VCC Figure 8  
    OUTPUT VALID CONDITIONS  
    The RST output uses a push-pull output which can maintain a valid output down to 0.8 volts VCC. To sink  
    current below 0.8 volts a resistor can be connected from RST to Ground (see Figure 8). This arrangement  
    will maintain a valid value on RST during both power-up and power-down but will draw current when  
    RST is in the high state. A value of about 100 kΩ=should be adequate in most situations. The output with  
    a resistor pull-down can maintain a valid reset down to VCC equal to 0 volts.  
    5 of 7  
    DS1832  
    ABSOLUTE MAXIMUM RATINGS*  
    Voltage on any Pin Relative to Ground  
    Voltage on I/O Relative to Ground  
    Operating Temperature  
    -0.5V to +7.0V  
    -0.5V to VCC +0.5V  
    -40°C to +85°C  
    Storage Temperature  
    Soldering Temperature  
    -55°C to +125°C  
    260°C for 10 seconds  
    * This is a stress rating only and functional operation of the device at these or any other conditions  
    above those indicated in the operation sections of this specification is not implied. Exposure to  
    absolute maximum rating conditions for extended periods of time may affect reliability.  
    RECOMMENDED DC OPERATING CONDITIONS  
    (-40°C to +85°C)  
    PARAMETER  
    SYMBOL MIN  
    TYP  
    MAX  
    5.5  
    UNITS NOTES  
    Supply Voltage  
    VCC  
    VIH  
    1.0  
    2.0  
    V
    V
    1
    VCC+0.3  
    1, 3  
    1, 4  
    ST and PBRST Input High Level  
    ST and PBRST Input Low Level  
    VCC  
    -0.4  
    -0.3  
    VIL  
    0.5  
    V
    1
    DC ELECTRICAL CHARACTERISTICS  
    (-40°C to +85°C; VCC=1.2V to 5.5V)  
    PARAMETER  
    SYMBOL MIN  
    TYP  
    2.88  
    2.55  
    MAX  
    2.97  
    2.64  
    +1.0  
    UNITS NOTES  
    VCC Trip Point (TOL = GND)  
    VCC Trip Point (TOL = VCC)  
    Input Leakage  
    VCCTP  
    VCCTP  
    IIL  
    2.80  
    2.47  
    -1.0  
    V
    V
    1
    1
    2
    3
    3
    4
    µA  
    µA  
    mA  
    V
    Output Current @ 2.4V  
    Output Current @ 0.4V  
    Output Voltage @ -500 uA  
    IOH  
    350  
    IOL  
    10  
    VOH  
    VCC  
    VCC  
    -0.3V -0.1V  
    Operating Current  
    ICC  
    35  
    5
    µA  
    CAPACITANCE  
    PARAMETER  
    (tA=25°C)  
    UNITS NOTES  
    SYMBOL MIN  
    TYP  
    MAX  
    Input Capacitance  
    Output Capacitance  
    CIN  
    5
    7
    pF  
    pF  
    COUT  
    6 of 7  
    DS1832  
    AC ELECTRICAL CHARACTERISTICS  
    (-40°C to +85°C; VCC=1.2V to 5.5V)  
    PARAMETER  
    SYMBOL MIN  
    TYP  
    610  
    5
    MAX  
    1000  
    8
    UNITS NOTES  
    tPB  
    20  
    ms  
    PBRST = VIL  
    RESET Active Time  
    tRST  
    tST  
    250  
    20  
    ms  
    ns  
    6, 7  
    8
    ST Pulse Width  
    tRPD  
    µs  
    VCC Detect to RST and RST  
    VCC Slew Rate  
    tF  
    20  
    µs  
    tRPU  
    250  
    610  
    1000  
    20  
    ms  
    9
    VCC Detect to RST and RST  
    VCC Slew Rate  
    tR  
    0
    ns  
    tPDLY  
    ms  
    PBRST Stable Low to RST and RST  
    NOTES:  
    1. All voltages referenced to ground.  
    2. PBRST is internally pulled up to VCC with an internal impedance of 40 kΩ=typical.  
    3. Measured with VCC ≥ 2.7V.  
    4. Measured with VCC < 2.7V.  
    5. Measured with outputs open, VCC ≤ 3.6 volts, and all inputs at VCC or Ground.  
    6. Must not exceed tTD minimum.  
    7. The Watchdog cannot be disabled it must be strobed to avoid resets.  
    8. Noise immunity - Pulses < 2 µs at VCCTP minimum will not cause a reset.  
    9. tR = 5 µs.  
    MARKING INFORMATION:  
    8-pin DIP - “DS1832”  
    8-pin SOIC - “DS1832”  
    8-pin - µ-SOP - “1832”  
    7 of 7  
    配单直通车
    DS1832S+T&R产品参数
    型号:DS1832S+T&R
    是否无铅： 不含铅
    是否Rohs认证： 符合
    生命周期：Active
    零件包装代码：SOIC
    包装说明：SOP, SOP8,.25
    针数：8
    Reach Compliance Code：compliant
    ECCN代码：EAR99
    HTS代码：8542.39.00.01
    Factory Lead Time：6 weeks
    风险等级：1.07
    其他特性：WATCHDOG TIMER
    可调阈值：NO
    模拟集成电路 - 其他类型：POWER SUPPLY MANAGEMENT CIRCUIT
    JESD-30 代码：R-PDSO-G8
    JESD-609代码：e3
    长度：4.9 mm
    湿度敏感等级：1
    信道数量：1
    功能数量：1
    端子数量：8
    最高工作温度：85 °C
    最低工作温度：-40 °C
    封装主体材料：PLASTIC/EPOXY
    封装代码：SOP
    封装等效代码：SOP8,.25
    封装形状：RECTANGULAR
    封装形式：SMALL OUTLINE
    峰值回流温度（摄氏度）：260
    电源：1.2/5.5 V
    认证状态：Not Qualified
    座面最大高度：1.75 mm
    子类别：Power Management Circuits
    最大供电电流 (Isup)：0.035 mA
    最大供电电压 (Vsup)：5.5 V
    最小供电电压 (Vsup)：1.2 V
    标称供电电压 (Vsup)：3.3 V
    表面贴装：YES
    技术：CMOS
    温度等级：INDUSTRIAL
    端子面层：Matte Tin (Sn)
    端子形式：GULL WING
    端子节距：1.27 mm
    端子位置：DUAL
    阈值电压标称：+2.55/2.88V
    处于峰值回流温度下的最长时间：NOT SPECIFIED
    宽度：3.9 mm
    Base Number Matches：1
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