MAX696:微处理器监控电路

工业标准、功能完备的µP监控电路

The MAX696/MAX697 supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. These include µP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The MAX696/MAX697 significantly improve system reliability and accuracy compared to that obtained with separate ICs or discrete components. The MAX696 and MAX697 are supplied in 16-pin packages and perform six functions: A reset output during power-up, power-down, and brownout conditions. The threshold for this "lowline" reset is adjustable by an external voltage-divider. A reset pulse if the optional watchdog timer has not been toggled within a specified time. Individual outputs for low-line and watchdog fault conditions. The reset time may be left at its default value of 50ms, or may be varied with an external capacitor or clock pulses. A separate 1.3V threshold detector for power-fail warning, low-battery detection, or to monitor a power supply other than VCC. The MAX696 also has battery-backup switching for CMOS RAM, CMOS microprocessor, or other low-power logic. The MAX697 lacks battery-backup switching, but has write-protection pins (active-low CE IN and active-low CE OUT) for CMOS RAM or EPROM. In addition, it consumes less than 250 microamperes.

关键特性
  • Adjustable Low-Line Monitor and Power-Down Reset
  • Power-OK/Reset Time Delay
  • Watchdog Timer—100ms, 1.6s, or Adjustable
  • Minimum Component Count
  • 1µA Standby Current
  • Battery-Backup Power Switching (MAX696)
  • On-Board Gating of Chip-Enable Signals (MAX697)
  • Separate Monitor for Power-Fail or Low-Battery Warning
MAX696、MAX697:原理框图
MAX696、MAX697:原理框图
应用
  • 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MAX696-MAX697.pdfRev 5; 08/2014
关键参数
Part NumberReset Thresh.
(V)
Reset OutICC
(µA)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
maxSee Notes
MAX6961.2 to 1.8
  • Active High
  • Active Low
  • Push-Pull
4000
  • -55 to +125
  • -40 to +85
  • 0 to +70
  • CDIP(N)/16
  • LCC/20
  • PDIP(N)/16
  • SOIC(W)/16
$5.35 @1k

Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX697
  • 1.2 to 1.8
  • 1.8 to 2.5
  • 2.5 to 3.3
  • 3.3 to 5.5
  • Active High
  • Active Low
  • Push-Pull
  • 1ms to 15ms
  • 15ms to 85ms
  • 85ms to 300ms
  • 300ms to 1s
  • <1ms
  • >1s
  • Adjustable
  • Input (WDI)
  • Input/Output (WDI/WDO)
  • 1s to 2s
  • <1s
  • >2s
  • Adjustable
  • Adjustable Reset Input
  • Power Fail Comparator/Low Battery Detect
2.5300
  • CDIP(N)/16
  • LCC/20
  • PDIP(N)/16
  • SOIC(W)/16
$5.35 @1k
质量和环境数据
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX696C/D生产中DICE SALES,;NA引脚;DICE S;0°C至+70°C参考数据资料
MAX696CPE停止供货MAX696CPE+PDIP(N),;16引脚;158.4mm²0°C至+70°CRoHS/无铅:否
MAX696CPE+生产中PDIP(N),;16引脚;158.4mm²0°C至+70°CRoHS/无铅:无铅
MAX696CWE停止供货MAX696CWE+SOIC(W),;16引脚;111.8mm²0°C至+70°CRoHS/无铅:否
MAX696CWE+生产中SOIC(W),;16引脚;111.8mm²0°C至+70°CRoHS/无铅:无铅
MAX696CWE+T生产中SOIC(W),;16引脚;111.8mm²0°C至+70°CRoHS/无铅:无铅
MAX696CWE-T停止供货MAX696CWE+TW.SO;16引脚0°C至+70°C参考数据资料
MAX696EJE停止供货CDIP(N),;16引脚;173.5mm²-40°C至+85°CRoHS/无铅:否
MAX696EPE停止供货MAX696EPE+PDIP(N),;16引脚;158.4mm²-40°C至+85°CRoHS/无铅:否
MAX696EPE+生产中PDIP(N),;16引脚;158.4mm²-40°C至+85°CRoHS/无铅:无铅
型号状况推荐替代产品封装:类型 引脚 占位面积封装图 编码/变更 *温度RoHS/无铅?
MAX696EWE停止供货MAX696EWE+SOIC(W),;16引脚;111.8mm²-40°C至+85°CRoHS/无铅:否
MAX696EWE+生产中SOIC(W),;16引脚;111.8mm²-40°C至+85°CRoHS/无铅:无铅
MAX696EWE+T生产中SOIC(W),;16引脚;111.8mm²-40°C至+85°CRoHS/无铅:无铅
MAX696EWE-T停止供货MAX696EWE+TW.SO;16引脚-40°C至+85°C参考数据资料
MAX696MJE停止供货CDIP(N),;16引脚;173.5mm²-55°C至+125°CRoHS/无铅:否
MAX696MJE/883B生产中CDIP(N),;16引脚;173.5mm²-55°C至+125°CRoHS/无铅:否
MAX696MLP/883B停止供货LCC,;20引脚;82.6mm²-55°C至+125°CRoHS/无铅:否
MAX696-MAX697.pdf MAX696
MAX696.pdf MAX696
MAX696-MAX697.pdf MAX697