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参数资料
| 型号： | DS1232LPSN/T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/7页 |
| 文件大小： | 0K |
| 描述： | IC MICRO MONITOR LP IND 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 系列： | MicroMonitor™ |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 4.37V，4.62V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
DS1232LP/LPS
The second function the DS1232LP/LPS performs is pushbutton reset control. The DS1232LP/LPS
debounces the pushbutton input and guarantees an active reset pulse width of 250 ms minimum. The third
function is a watchdog timer. The DS1232LP/LPS 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, and 1.2 seconds.
OPERATION - POWER MONITOR
The DS1232LP/LPS detects out-of-tolerance power supply conditions and warns a processor-based
system of impending power failure. When V CC falls below a preset level as defined by TOL, the V C C
comparator outputs the signals RST and RST . When TOL is connected to ground, the RST and RST
signals become active as V CC falls below 4.75 volts. When TOL is connected to V CC , the RST and RST
signals become active as V CC falls below 4.5 volts. The RST and RST are excellent control signals for a
microprocessor, as processing is stopped at the last possible moments of valid V CC . 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 DS1232LP/LPS provides an input pin for direct connection to a pushbutton (Figure 1). 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 starts as the
pushbutton reset input is released from low level.
OPERATION - WATCHDOG TIMER
The watchdog timer function forces RST and RST signals to the active state when the ST input is not
stimulated for a predetermined time period. The time period is set by the TD input to be typically 150 ms
with TD connected to ground, 600 ms with TD left unconnected, and 1.2 seconds with TD connected to
V CC . The watchdog timer starts timing out from the set time period as soon as RST and RST are 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 to the active state for 250 ms minimum. The ST input can be derived from microprocessor address
signals, data signals, and/or control signals. When the microprocessor is functioning 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
shown in Table 1. A typical circuit example is shown in Figure 2.
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相关代理商/技术参数 |
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| DS1232LPU | 功能描述:监控电路 Low Power MicroMonitor Chip RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| DS1232LPU/T&R | 制造商:Maxim Integrated Products 功能描述:UMONITOR LOW POWER 8P USOP T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MICRO MONITOR LP 8-USOP 制造商:Maxim Integrated Products 功能描述:Supervisory Circuits Low Power MicroMonitor Chip |
| DS1232LPU/T&R | 功能描述:监控电路 Low Power MicroMonitor Chip RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| DS1232LPU+ | 功能描述:监控电路 Low Power MicroMonitor Chip RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| DS1232LPU+T&R | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 4.62V 200UA 8USOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MICRO MONITOR LP 8-USOP 制造商:Maxim Integrated Products 功能描述:Supervisory Circuits Low Power MicroMonitor Chip |
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