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| 型号： | MAX704CSA |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/9页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISORY CIRCUIT 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.4V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1412 (CN2011-ZH PDF) |
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
Pin Description
PIN
1
2
3
4
5
6
7
NAME
V OUT
V CC
GND
PFI
PFO
MR
RESET
FUNCTION
Supply Output for CMOS RAM. When V CC is above the reset threshold, V OUT connects to V CC through a p-
channel MOSFET switch. When V CC is below the reset threshold, the higher of V CC or V BATT is connected to V OUT .
+5V Supply Input
Ground
Power-Fail Comparator Input. When PFI is less than 1.25V, PFO goes low; otherwise PFO remains high. Connect
PFI to GND or V CC when not used.
Power-Fail Comparator Output. It goes low and sinks current when PFI is less than 1.25V; otherwise PFO remains high.
Manual Reset Input. Generates a reset pulse when pulled below 0.8V. This active-low input is TTL/CMOS
compatible and can be shorted to ground with a switch. It has an internal 250μA pullup current. Leave floating
when not used.
Reset Output. Remains low while V CC is below the reset threshold (4.65V for the MAX703, 4.40V for the MAX704).
It remains low for 200ms after V CC rises above the reset threshold (Figure 2) or MR goes from low to high.
Backup-Battery Input. When V CC falls below the reset threshold, V BATT is switched to V OUT if V BATT is 20mV
8
V BATT greater than V CC . When V CC rises 20mV above V BATT , V CC is switched to V OUT . The 40mV hysteresis prevents
repeated switching if V CC falls slowly.
+5V
V CC
V BATT
BATTERY-SWITCHOVER
CIRCUITRY
V OUT
0V
V RST
V BATT = 3.0V
V CC
+5V
V OUT
RESET
GENERATOR
RESET
0V
3.0V
t RST
+5V
MR
PFI
1.25V
PFO
RESET
0V
+5V
PFO*
1.25V
MAX703
Figure 1. Block Diagram
GND
MAX704
0V
*PFO DEPENDS ON PFI EXCEPT IN BATTERY-BACKUP MODE, WHERE PFO IS LOW.
Figure 2. Timing Diagram
4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX704CSA+ | 功能描述:监控电路 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 |
| MAX704CSA+T | 功能描述:监控电路 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 |
| MAX704CSA-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 |
| MAX704EPA | 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 |
| MAX704EPA+ | 功能描述:监控电路 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 |
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