5-Pin Watchdog Timer Circuit


The MAX6814 is a low-power watchdog circuit in a tiny 5- pin SC70 package. This device improves system reliability by monitoring the system for software code execution errors. When the watchdog input detects a transitional edge, the internal watchdog timer clears and restarts, then begins counting again. If the watchdog timer exceeds the watchdog timeout period (1.6s typ), the active-low, push-pull watchdog output asserts for the watchdog pulse period (140ms min) to alert the system of the fault.

The MAX6814 consumes only 4µA of supply current and is fully specified over the extended temperature range.
MAX6814: Typical Operating Circuit MAX6814: Typical Operating Circuit Enlarge+

Key Features

  • 4µA Operating Current
  • Watchdog Timer with 1.6s Timeout
  • 140ms (min) active-low WDO Pulse Period
  • Push-Pull Active-Low WDO
  • Fully Specified Over Extended Temperature Range
  • No External Components


  • Computers and Controllers
  • Critical µP Monitoring
  • Embedded Controllers
  • Intelligent Instruments
Part Number Watchdog Feature Watchdog Timeout Watchdog Output ICC
Package/Pins Oper. Temp.
max See Notes
Input (WDI)
Input/Output (WDI/WDO)
Watchdog Only
1s to 2s Push-Pull 24
-40 to +85
0 to +70
$1.54 @1k
See All Watchdog Timers (9)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Quality and Environmental Data

Product Reliability Reports: MAX6814.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX6814

Related Resources