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参数资料
| 型号： | DS1238A |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | 电源管理 |
| 英文描述： | MicroManager(微管理器芯片) |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP16 |
| 封装： | 0.300 INCH, DIP-16 |
| 文件页数： | 2/13页 |
| 文件大小： | 159K |
| 代理商： | DS1238A |
DS1238A
022698 2/13
PIN DESCRIPTION
PIN NAME
DESCRIPTION
V
BAT
+3V Battery Input provides nonvolatile operation of control functions.
V
CCO
V
CC
output for nonvolatile SRAM applications.
V
CC
+5V primary power input.
GND
System ground.
PF
Power fail indicator, active high, used for external power switching as shown in NO TAG.
RVT
Reset Voltage Threshold. Indicates that V
CC
is below the reset voltage threshold.
OSCIN
Oscillator input or timing capacitor. See NO TAG.
OSCSEL
Oscillator Select. Selects internal or external clock functions. See NO TAG.
IN
Early warning power fail input. This voltage sense point may be tied (via resistor divider) to a
user-selected voltage.
NMI
Non-maskable interrupt. Output used in conjunction with the IN pin to indicate an impending
power failure.
ST
Strobe input. A high–to–low transition will reset the watchdog timer, indicating that software is
still in control.
CEO
Chip enable output. Write protected. Used with nonvolatile SRAM applications.
CEI
Chip enable input.
WDS
Watchdog Status. Indicates that a watchdog timeout has occurred.
RST
Active low reset output.
RST
Active high reset output.
POWER MONITOR
The DS1238A employs a band gap 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% op-
eration option (DS1238A-5) is set for 4.75 volts (4.62
typical). The RST and RST signals are excellent for mi-
croprocessor reset control, as processing is stopped at
the last possible moment of in-tolerance V
CC
. On power
up, RVT will become inactive as soon as V
CC
rises
above V
CCTP
. However, the RST and RST signals re-
main active for a minimum of 50 ms (100 ms typical) af-
ter V
CCTP
is reached to allow the power supply and mi-
croprocessor to stabilize.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1238 | MicroManager(微管理器芯片) |
| DS1239 | MicroManager Chip(微管理器芯片) |
| DS1250AB | 4096K Nonvolatile SRAM(4096K 非易失性静态RAM) |
| DS1250Y | 4096K Nonvolatile SRAM(4096K 非易失性静态RAM) |
| DS1250W | 3.3V 4096K Nonvolatile SRAM(3.3V 4096K 非易失性静态RAM) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1238A-10 | 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 |
| DS1238A-10+ | 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 |
| DS1238A10N | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| DS1238A-10N | 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 |
| DS1238A-10N+ | 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 |
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