DS1814A, DS1814B, DS1814C:5V及3.3V MicroMonitor

The DS1814 5-Volt MicroMonitor and the DS1819 3.3V MicroMonitor monitor three vital conditions for a microprocessor: power supply, software execution, and external override. First, a precision temperature-compensated reference and comparator circuit monitor the status of VCC. When an out-of-tolerance condition occurs, an internal power-fail signal is generated which forces the reset(s) to an active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for a minimum of 140ms to allow the power supply and processor to stabilize. The DS1814/DS1819 ‘A' and ‘C' perform pushbutton reset control. They debounce the pushbutton input and generate an active reset pulse width of 140ms minimum. The DS1814/9 'A' and 'B' versions perform a watchdog function. The watchdog is an internal timer that forces the reset signals to the active state if the strobe input does not change state every 1.12 seconds. The watchdog timer function can be disabled by leaving the watchdog strobe input disconnected.

关键特性
  • Halts and restarts an out-of-control microprocessor
  • Holds microprocessor in check during power transients
  • Automatically restarts microprocessor after power failure
  • Monitors pushbutton for external override
  • Accurate 5%, 10%, or 20% (3V only) microprocessor power monitoring
  • Eliminates the need for discrete components
  • 20% tolerance for use with 3.0V systems
  • Pin- and function-compatible with the MAX823/24/25 products
  • Low cost SOT-23-5 package
  • Industrial temperature range: -40°C to +85°C
DS1814、DS1819:原理框图
DS1814、DS1819:原理框图
数据手册DataSheet
语言下载文件备注
英文DS1814-DS1819C.pdfRev 1; 11/1999
关键参数
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
DS1814A3.3 to 5.5
  • Active Low
  • Push-Pull
85ms to 300msInput (WDI)1s to 2sManual Reset2.515SOT/5$0.72 @1k
DS1814B3.3 to 5.5
  • Active High
  • Active Low
  • Push-Pull
Input (WDI)1s to 2s-15SOT/5$0.72 @1k
DS1814C3.3 to 5.5
  • Active High
  • Active Low
  • Push-Pull
No Watchdog-Manual Reset15SOT/5$0.72 @1k
DS1819A2.5 to 3.3
  • Active Low
  • Push-Pull
Input (WDI)1s to 2sManual Reset12SOT/5$2.17 @1k
DS1819B2.5 to 3.3
  • Active High
  • Active Low
  • Push-Pull
Input (WDI)1s to 2s-12SOT/5$2.17 @1k
DS1819C2.5 to 3.3
  • Active High
  • Active Low
  • Push-Pull
No Watchdog-Manual Reset12SOT/5$2.17 @1k
技术资料
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
DS1814AR-10-U停止供货DS1814AR-10-U+SOT,;5引脚;9mm²-40°C至+85°CRoHS/无铅:否
DS1814AR-10-U+生产中SOT,;5引脚;9mm²-40°C至+85°CRoHS/无铅:无铅
DS1814AR-10/T&R5V-10%停止供货DS1814AR-10+T&RSOT,;5引脚;9mm²-40°C至+85°CRoHS/无铅:否
DS1814AR-5+T&R5V-5%生产中SOT,;5引脚;9mm²-40°C至+85°CRoHS/无铅:无铅
DS1814AR-5-U停止供货DS1814AR-5-U+SOT,;5引脚;9mm²-40°C至+85°CRoHS/无铅:否
DS1814AR-5-U+生产中SOT,;5引脚;9mm²-40°C至+85°CRoHS/无铅:无铅
DS1814AR-5/T&R5V-5%停止供货DS1814AR-5+T&RSOT,;5引脚;9mm²-40°C至+85°CRoHS/无铅:否
DS1814-DS1819C.pdf DS1819C
Using the DS1814 MicroMonitor to Control Microprocessor Resets DS1814C
原理框图 DS1819