(ACTIVE) Window Watchdog Timer With Programmable Reset Delay


Functional Diagram


The TPS3430 is a standalone window watchdog timer with programmable watchdog window and programmable watchdog reset delay for a wide variety of applications. The TPS3430 window watchdog achieves 15% timing accuracy (–40°C to +125°C), 2.5% timing accuracy (typical at 25°C) and the watchdog output (WDO) reset delay can be set by factory-programmed default delay settings, or programmed by an external capacitor. The watchdog can be disabled via the SET pins to avoid undesired watchdog timeouts during the development process or during power on.

The TPS3430 is available in a small 3.00-mm ×
3.00-mm, 10-pin VSON package.


  • Factory-Programmed Precision Watchdog Timers:
    • ±15% Accurate Watchdog Timeout and Watchdog Reset Delays Over Temperature
    • ±2.5% Accurate Watchdog Timeout and Watchdog Reset Delays Typical at 25°C
  • Watchdog Disable Feature
  • User-Programmable Watchdog Timeout
  • User-Programmable Watchdog Reset Delay
  • Input Voltage Range: VDD = 1.6 V to 6.5 V
  • Low Supply Current: IDD = 10 µA (typical)
  • Open-Drain Output
  • Small 3-mm × 3-mm, 10-Pin VSON Package
  • Junction Operating Temperature Range:
    –40°C to +125°C

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Threshold Voltage 1 (Typ) (V) N/A    
Number of supplies monitored 1    
VCC (Max) (V) 6.5    
VCC (Min) (V) 1.6    
Output driver type/reset output Active-low^Open-drain    
Time Delay (ms) Programmable    
Features Watchdog timer^Window watchdog^Watchdog disable    
Rating Catalog    
Operating temperature range (C) -40 to 125    
Watchdog timer WDI (sec) Programmable    

Companion Products

Technical Documents

Datasheet (1)

Application notes (2)

User guides (1)

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