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电路监控、电压监测器及排序器 
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MyMaxim 订阅产品详情
主要特征
应用/用途
Parametric specs for Battery Backup Circuits
| Reset Thresh. (V) | 4.5 to 5.0 |
| Reset Out | Active Low Push-Pull |
| ICC (µA) (max) | 5000 |
| Oper. Temp. (°C) | -55 to +125 -40 to +85 0 to +70 |
| Package/Pins | CDIP/8 PDIP/8 |
| Budgetary Price (See Notes) | 4.87 |
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简化框图
Technical Docs
| 数据资料 | 微处理器监控电路 | May 06, 2015 | |
| 应用笔记 | Large Capacitor Replaces Backup Battery | ||
| 应用笔记 | µP-Supervisor Chip Controls Programmable Filter |
参量
Parametric specs for Battery Backup Circuits
| Reset Thresh. (V) | 4.5 to 5.0 |
| Reset Out | Active Low Push-Pull |
| ICC (µA) (max) | 5000 |
| Oper. Temp. (°C) | -55 to +125 -40 to +85 0 to +70 |
| Package/Pins | CDIP/8 PDIP/8 |
| Budgetary Price (See Notes) | 4.87 |
主要特征
- Supervisory Function Integration Saves Board Space while Fully Protecting Microprocessor-Based Systems
- Precision Voltage Monitor
- 4.65V (MAX690, MAX691, MAX694, MAX695)
- 4.40V (MAX692, MAX693)
- Power OK/Reset Time Delay
- 50ms, 200ms, or Adjustable
- Watchdog Timer
- 100ms, 1.6s, or Adjustable
- Battery Backup Power Switching
- Voltage Monitor for Power Fail or Low Battery Warning
- Minimum External Component Count
- Precision Voltage Monitor
- Low Power Consumption in Battery Backup Mode Extends Battery Life
- 1µA Standby Current
- Onboard Gating of Chip Enable Signals Protects Against Erroneous Data Written to RAM During Low VCC Events
应用/用途
- 汽车系统
- 计算机
- 控制器
- 精确的µP电源监控
- 智能仪表
描述
The MAX690 family of supervisory circuits reduces the complexity and number of components required for power supply monitoring and battery control functions in microprocessor systems. These include µP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The MAX690 family significantly improves system reliability and accu- racy compared to that obtainable with separate ICs or discrete components.
The MAX690, MAX692, and MAX694 are supplied in 8-pin packages and provide four functions:
- A reset output during power-up, power-down, and brownout conditions.
- Battery backup switching for CMOS RAM, CMOS microprocessor or other low power logic.
- A Reset pulse if the optional watchdog timer has not been toggled within a specified time.
- A 1.3V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than +5V.
The MAX691, MAX693, and MAX695 are supplied in 16-pin packages and perform all MAX690, MAX692, MAX694 functions, plus:
- Write protection of CMOS RAM or EEPROM.
- Adjustable reset and watchdog timeout periods.
- Separate outputs for indicating a watchdog timeout, backup-battery switchover, and low VCC.
Technical Docs
| 数据资料 | 微处理器监控电路 | May 06, 2015 | |
| 应用笔记 | Large Capacitor Replaces Backup Battery | ||
| 应用笔记 | µP-Supervisor Chip Controls Programmable Filter |
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