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MAX690
电源管理 电路监控、电压监测器及排序器 MAX690
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MAX690

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微处理器监控电路

工业标准、功能完备的µP监控电路

可打印的数据手册 订阅

产品详情

请参见参数规范 Battery Backup Circuits

主要特征

请参见参数规范 Battery Backup Circuits
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) 		5.21
请参见参数规范 Battery Backup Circuits
缩小

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

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题，请访问Maxim的 支持中心 。

采样:
选择上方“样片”按钮将重定向至第三方ADI样片网站。登录后，所选部件将转移到您在此网站上的购物车。如果您之前从未使用过此网站，请创建一个新帐户。有关此样片网站的任何问题，请联系SampleSupport@analog.com。

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) 		5.21
See parametric specs for Battery Backup Circuits

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
  • 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.

简化框图

MAX690、MAX691、MAX692、MAX693、MAX694、MAX695：引脚配置 MAX690、MAX691、MAX692、MAX693、MAX694、MAX695：引脚配置 Zoom icon

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

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题，请访问Maxim的 支持中心 。

采样:
选择上方“样片”按钮将重定向至第三方ADI样片网站。登录后，所选部件将转移到您在此网站上的购物车。如果您之前从未使用过此网站，请创建一个新帐户。有关此样片网站的任何问题，请联系SampleSupport@analog.com。