MAX6821:低电压、SOT23封装、微处理器监控电路,带有手动复位及看门狗定时器

The MAX6821—MAX6825 are low-voltage microprocessor (µP) supervisory circuits that combine voltage monitoring, watchdog timer, and manual reset input functions in a 5-pin SOT23 package. Microprocessor supervisory circuits significantly improve system reliability and accuracy compared to separate ICs or discrete components. These devices assert a reset signal whenever the monitored voltage drops below its preset threshold, keeping it asserted for a minimum timeout period after VCC rises above the threshold. In addition, a watchdog timer monitors against code execution errors. A debounced manual reset is also available. The MAX6821—MAX6825 monitor voltages from +1.8V to +5.0V. These outputs are guaranteed to be in the correct state for VCC down to +1.0V. Nine preprogrammed reset threshold voltages are available (see the Threshold Suffix Guide). The MAX6821, MAX6822, and MAX6823 all have a manual reset input and a watchdog timer. The MAX6821 has push-pull RESET, the MAX6822 has open-drain active-low RESET, and the MAX6823 has push-pull active-low RESET. The MAX6824 has a watchdog timer and both push-pull active-low RESET and push-pull RESET. The MAX6825 has a manual reset input and both push-pull active-low RESET and push-pull RESET. The Selector Guide explains the functions offered in this series of parts.

关键特性
  • Monitors +1.8V, +2.5V, +3.0V, +3.3V, +5.0V Supplies
  • 140ms (min) Reset Timeout Delay
  • 1.6s Watchdog Timeout Period (MAX6821/MAX6822/MAX6823/MAX6824)
  • Manual Reset Input (MAX6821/MAX6822/MAX6823/MAX6825)
  • Three Reset Output Options
    • Push-Pull Active-Low RESET
    • Push-Pull RESET
    • Open-Drain Active-Low RESET
  • Guaranteed Reset Valid to VCC = +1.0V
  • Immune to Short Negative VCC Transients
  • No External Components
  • Small 5-Pin SOT23 Packages
MAX6821、MAX6822、MAX6823、MAX6824、MAX6825:典型工作电路
MAX6821、MAX6822、MAX6823、MAX6824、MAX6825:典型工作电路
应用
  • 计算机与控制器
  • 精确的µP监控
  • 嵌入式控制器
  • 智能仪表
  • 便携式电池供电设备
  • 机顶盒
数据手册DataSheet
语言下载文件备注
英文MAX6821-MAX6825.pdfRev 3; 09/2014
关键参数
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX6821
  • 1.2 to 1.8
  • 1.8 to 2.5
  • 2.5 to 3.3
  • 3.3 to 5.5
  • Active High
  • Push-Pull
85ms to 300msInput (WDI)1s to 2sManual Reset2.516SOT/5$1.55 @1k
MAX6822
  • Active Low
  • Open Drain
Input (WDI)1s to 2sManual Reset16SOT/5$1.55 @1k
MAX6823
  • Active Low
  • Push-Pull
Input (WDI)1s to 2sManual Reset16SOT/5$1.77 @1k
MAX6824
  • Active High
  • Active Low
  • Push-Pull
Input (WDI)1s to 2s-16SOT/5$1.77 @1k
MAX6825
  • Active High
  • Active Low
  • Push-Pull
No Watchdog-Manual Reset12SOT/5$1.55 @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
MAX6821LUK-T停止供货SOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:否
MAX6821MUK-T停止供货SOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:否
MAX6821RUK+生产中SOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:无铅
MAX6821RUK+T生产中SOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:无铅
MAX6821RUK-T停止供货MAX6821RUK+TSOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:否
MAX6821SUK+生产中SOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:无铅
MAX6821SUK+T生产中SOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:无铅
MAX6821SUK-T停止供货MAX6821SUK+TSOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:否
MAX6821TUK-T停止供货SOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:否
MAX6821VUK-T停止供货SOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:否
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?
MAX6821WUK-T停止供货SOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:否
MAX6821YUK-T停止供货SOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:否
MAX6821ZUK-T停止供货SOT,;5引脚;9mm²-40°C至+125°CRoHS/无铅:否
MAX6821-MAX6825.pdf MAX6825
MAX6821.pdf MAX6821
典型工作电路 MAX6825