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参数资料
| 型号： | MAX817LEPA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 5V 8-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
+5V Microprocessor Supervisory Circuits
______________________________________________________________Pin Description
PIN
NAME
FUNCTION
MAX817
MAX818
MAX819
Supply Output for CMOS RAM. When V CC rises above the reset threshold
1
1
1
OUT
or above V BATT , OUT is connected to V CC through an internal P-channel
MOSFET switch. When V CC falls below V BATT , BATT connects to OUT.
2
3
2
3
2
3
V CC
GND
Input Supply Voltage, +5V input.
Ground. 0V reference for all signals.
Power-Fail Comparator Input. When V PFI is below V PFT or when V CC is below
4
—
4
PFI
V BATT , PFO goes low; otherwise, PFO remains high (see Power-Fail Comparator
section). Connect to ground if unused.
—
4
—
CE IN
Chip-Enable Input. The input to the chip-enable gating circuit. Connect to
ground if unused.
Power-Fail Comparator Output. When PFI is less than V PFT or when V CC is
5
—
5
PFO
below V BATT , PFO goes low; otherwise PFO remains high. PFO is also used to
enable the battery freshness seal (see Battery Freshness Seal and Power-Fail
Comparator sections).
Chip-Enable Output. CE OUT goes low only if CE IN is low while reset is not
asserted. If CE IN is low when reset is asserted, CE OUT will remain low for
—
5
—
CE OUT
15μs or until CE IN goes high, whichever occurs first. CE OUT is pulled up to
OUT in battery-backup mode. CE OUT is also used to enable the battery
freshness seal (see Battery Freshness Seal section).
Watchdog Input. If WDI remains either high or low for longer than the watch-
dog timeout period, the internal watchdog timer runs out and a reset is trig-
gered. If WDI is left unconnected or is connected to a high-impedance
three-state buffer, the watchdog feature is disabled. The internal watchdog
6
6
—
WDI
timer clears whenever reset is asserted, WDI is three-stated, or WDI sees a ris-
ing or falling edge. The WDI input is designed to be driven by a three-stated-
output device with a maximum high-impedance leakage current of 10μA and a
maximum output capacitance of 200pF. The output device must also be capa-
ble of sinking and sourcing 200μA when active.
Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted
for as long as MR is held low and for 200ms after MR returns high. The active-
—
—
6
MR
low input has an internal 63k ? pull-up resistor. It can be driven from a TTL- or
CMOS-logic line or shorted to ground with a switch. Leave open, or connect to
V CC if unused.
Active-Low Reset Output. Pulses low for 200ms when triggered and remains
7
7
7
RESET
low whenever V CC is below the reset threshold or when MR is a logic low. It
remains low for 200ms after V CC rises above the reset threshold, the watchdog
triggers a reset, or MR goes low to high.
8
8
8
BATT
Backup-Battery Input. When V CC falls below V BATT , OUT switches from V CC to
BATT. When V CC rises above V BATT , OUT reconnects to V CC .
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX817LEPA+ | 功能描述:监控电路 5V MPU Supervisor 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 |
| MAX817LESA | 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 |
| MAX817LESA+ | 功能描述:监控电路 5V MPU Supervisor 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 |
| MAX817LESA+T | 功能描述:监控电路 5V MPU Supervisor 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 |
| MAX817LESA-T | 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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