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参数资料
| 型号： | DS1238AS-5+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/13页 |
| 文件大小： | 0K |
| 描述： | IC MICROMANAGER 5% 16-SOIC |
| 标准包装： | 1,000 |
| 系列： | MicroManager |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 40 ms |
| 电压 - 阀值： | 4.62V |
| 工作温度： | 0°C ~ 70°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) |
DS1238A
debounce circuit connected to the RST pin. An internal watchdog timer can also force the reset outputs to
the active state if the strobe input is not driven low prior to watchdog timeout. Oscillator control pins
OSCSEL and OSCIN provide either external or internal clock timing for both the reset pulse width and
the watchdog timeout period. The Watchdog Status and Reset Voltage Threshold are provided via WDS
and RVT , respectively. A block diagram of the DS1238A is shown in NO TAG.
PIN DESCRIPTION
PIN NAME
V BAT
V CCO
V CC
PF
RVT
OSCIN
OSCSEL
IN
NMI
ST
CEO
CEI
WDS
RST
RST
DESCRIPTION
+3V battery input provides nonvolatile operation of control functions.
V CC output for nonvolatile SRAM applications.
+5V primary power input.
Power-fail indicator, active high, used for external power switching as shown in NO
TAG.
Reset Voltage Threshold. Indicates that V CC is below the reset voltage threshold.
Oscillator input or timing capacitor. See NO TAG.
Oscillator Select. Selects internal or external clock functions. See NO TAG.
Early warning power-fail input. This voltage sense point can be tied (via resistor
divider) to a user-selected voltage.
Non-maskable interrupt. Used in conjunction with the IN pin to indicate an impending
power failure.
Strobe input. A high-to-low transition will reset the watchdog timer, indicating that
software is still in control.
Chip enable output. Used with nonvolatile SRAM applications.
Chip enable input.
Watchdog Status. Indicates that a watchdog timeout has occurred.
Active low reset output.
Active high reset output.
POWER MONITOR
The DS1238A employs a bandgap voltage reference and a precision comparator to monitor the 5-volt
supply (V CC ) in microprocessor-based systems. When an out-of-tolerance condition occurs, the RVT ,
RST, and RST outputs are driven to the active state. The V CC trip point (V CCTP ) is set for 10% operation
so that the RVT , RST and RST outputs will become active as V CC falls below 4.5 volts (4.37 typical).
The V CCTP for the 5% operation option (DS1238A-5) is set for 4.75 volts (4.62 typical). The RST and
RST signals are excellent for microprocessor reset control, as processing is stopped at the last possible
moment of in-tolerance V C C . On power-up, RVT will become inactive as soon as V CC rises above V CCTP .
However, the RST and RST signals remain active for a minimum of 50 ms (100 ms typical) after V CCTP is
reached to allow the power supply and microprocessor to stabilize.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1238N | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Power Supply Supervisor |
| DS1238S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Power Supply Supervisor |
| DS1238S/T&R | 功能描述:监控电路 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 |
| DS1238S/T&R/ | 功能描述:监控电路 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 |
| DS1238S+T&R | 制造商:Maxim Integrated Products 功能描述:IC MICROMAN W/FRESH 10% 16-SOIC |
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