MAX690:微处理器监控电路

工业标准、功能完备的µP监控电路

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.

关键特性
  • 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
MAX690、MAX691、MAX692、MAX693、MAX694、MAX695:引脚配置
MAX690、MAX691、MAX692、MAX693、MAX694、MAX695:引脚配置
应用
  • 汽车系统
  • 计算机
  • 控制器
  • 精确的µP电源监控
  • 智能仪表
数据手册DataSheet
语言下载文件备注
英文MAX690-MAX695.pdfRev 5; 05/2015
关键参数
Part NumberReset Thresh.
(V)
Reset OutICC
(µA)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
maxSee Notes
MAX6904.5 to 5.0
  • Active Low
  • Push-Pull
5000
  • -55 to +125
  • -40 to +85
  • 0 to +70
  • CDIP(N)/8
  • LCC/20
  • PDIP(N)/8
$4.37 @1k
MAX6914.5 to 5.0
  • Active High
  • Active Low
  • Push-Pull
  • CDIP(N)/16
  • LCC/20
  • PDIP(N)/16
  • SOIC(W)/16
$4.17 @1k
MAX6924.0 to 4.5
  • Active Low
  • Push-Pull
  • CDIP(N)/8
  • LCC/20
  • PDIP(N)/8
$4.37 @1k
MAX6934.0 to 4.5
  • Active High
  • Active Low
  • Push-Pull
  • CDIP(N)/16
  • LCC/20
  • PDIP(N)/16
  • SOIC(W)/16
$4.17 @1k
MAX6944.5 to 5.0
  • Active Low
  • Push-Pull
  • CDIP(N)/8
  • LCC/20
  • PDIP(N)/8
$4.00 @1k
MAX6954.5 to 5.0
  • Active High
  • Active Low
  • Push-Pull
  • CDIP(N)/16
  • PDIP(N)/16
  • SOIC(W)/16
$4.37 @1k
技术资料
质量和环境数据
相关产品
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX690C/D停止供货DICE SALES,;NA引脚;DICE;0°C至+70°C参考数据资料
MAX690CPA停止供货MAX690CPA+PDIP(N),;8引脚;79.7mm²0°C至+70°CRoHS/无铅:否
MAX690CPA+生产中PDIP(N),;8引脚;79.7mm²0°C至+70°CRoHS/无铅:无铅
MAX690EJA生产中CDIP(N),;8引脚;82.6mm²-40°C至+85°CRoHS/无铅:否
MAX690EPA停止供货MAX690EPA+PDIP(N),;8引脚;79.7mm²-40°C至+85°CRoHS/无铅:否
MAX690EPA+生产中PDIP(N),;8引脚;79.7mm²-40°C至+85°CRoHS/无铅:无铅
MAX690MFB/883B停止供货FPCK;10引脚-55°C至+125°C参考数据资料
MAX690MJA生产中CDIP(N),;8引脚;82.6mm²-55°C至+125°CRoHS/无铅:否
MAX690MJA/883B生产中CDIP(N),;8引脚;82.6mm²-55°C至+125°CRoHS/无铅:否
MAX690MLP/883B生产中LCC,;20引脚;82.6mm²-55°C至+125°CRoHS/无铅:否
MAX690-MAX695.pdf MAX695
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MAX690.pdf MAX690