Pin-Selectable Watchdog Timers

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The MAX6369–MAX6374 are pin-selectable watchdog timers that supervise microprocessor (µP) activity and signal when a system is operating improperly. During normal operation, the microprocessor should repeatedly toggle the watchdog input (WDI) before the selected watchdog timeout period elapses to demonstrate that the system is processing code properly. If the µP does not provide a valid watchdog input transition before the timeout period expires, the supervisor asserts a watchdog (active-low WDO) output to signal that the system is not executing the desired instructions within the expected time frame. The watchdog output pulse can be used to reset the µP or interrupt the system to warn of processing errors.

The MAX6369–MAX6374 are flexible watchdog timer supervisors that can increase system reliability through notification of code execution errors. The family offers several pin-selectable watchdog timing options to match a wide range of system timing applications:
  • Watchdog startup delay: provides an initial delay before the watchdog timer is started.
  • Watchdog timeout period: normal operating watchdog timeout period after the initial startup delay.
  • Watchdog output/timing options: open drain (100ms) or push-pull (1ms).
The MAX6369-MAX6374 operate over a +2.5V to +5.5V supply range and are available in miniature 8-pin SOT23 packages.
MAX6369, MAX6370, MAX6371, MAX6372, MAX6373, MAX6374: Functional Diagram MAX6369, MAX6370, MAX6371, MAX6372, MAX6373, MAX6374: Functional Diagram Enlarge+

Key Features

  • Precision Watchdog Timer for Critical µP Applications
  • Pin-Selectable Watchdog Timeout Periods
  • Pin-Selectable Watchdog Startup Delay Periods
  • Ability to Change Watchdog Timing Characteristics Without Power Cycling
  • Open-Drain or Push-Pull Pulsed Active-Low Watchdog Output
  • Watchdog Timer Disable Feature
  • +2.5V to +5.5V Operating Voltage
  • 8µA Low Supply Current
  • No External Components Required
  • Miniature 8-Pin SOT23 Package
  • AEC-Q100 Qualified (MAX6369KA/V+ and MAX6374KA/V+ Only)


  • Automotive
  • Critical µP and Microcontroller (µC) Monitoring
  • Embedded Control Systems
  • Industrial Controllers
  • Networking
  • Telecommunications

See parametric specs for Watchdog Timers (10)

Part NumberWatchdog FeatureWatchdog TimeoutWatchdog Startup DelayWatchdog OutputICC
Package/PinsOper. Temp.
minmaxSee Notes
Input (WDI)
Input/Output (WDI/WDO)
Pin Selectable
Watchdog Only
1s to 2s
-40 to +85
0 to +70
$1.81 @1k
MAX6370 <60sPush-Pull
MAX6371 60sOpen-Drain
MAX6372 60sPush-Pull
MAX6373 >60sOpen-Drain
MAX6374 >60sPush-Pull

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.

Technical Documents

App Note 1865 Different Ways to Use a MAX6369 Series Watchdog Timer

Additional Resources

Breakout/Adapter Boards: SOT-23-5

Powering Through Faults on the Smart Grid

Product Reliability Reports: MAX6372.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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