Texas Instruments TPS3436-Q1 Precision Window-Watchdog Timer

Texas Instruments TPS3436-Q1 Precision Window-Watchdog Timer is an ultra-low power consumption (250nA typical) device offering a programmable window watchdog timer. The TPS3436-Q1 provides a high-accuracy window watchdog timer with a host of features for various applications. The close window timer can be factory-programmed or user-programmed using an external capacitor. The open-window to close-window ratio can be changed on the fly using a combination of logic pins. The watchdog also offers unique features such as enable-disable and startup delay.

The WDO delay can be set by factory-programmed default delay settings or programmed by an external capacitor. The device also offers a latched output operation where the output is latched until the watchdog fault is cleared. The TPS3436-Q1 provides a performance upgrade alternative to the TPS3430-Q1 device family. The Texas Instruments TPS3436-Q1 is available in a small 8-pin SOT-23 package.


  • AEC-Q100 qualified with the following results
    • Device temperature grade 1 (–40°C to 125°C ambient operating temperature range)
  • Factory-programmed or user-programmable watchdog timeout
    • ±10% accurate timer (maximum)
    • Factory programmed close window of 1msec to 100sec
  • Factory-programmed or user-programmable reset delay
    • ±10% accurate timer (maximum)
    • Factory programmed option of 2msec to 10sec
  • Input voltage range of VDD = 1.04V to 6.0V
  • Ultra-low supply current of IDD = 250nA (typical)
  • Open-drain, push-pull, active-low outputs
  • Various programmability options
    • Watchdog enable-disable
    • Watchdog startup delay of no delay to 10sec
    • Open window to close window ratio option of 1X to 511X
    • Latched output option
  • MR functionality support


  • Onboard (OBC) and wireless charger
  • Driver monitoring
  • Battery Management System (BMS)
  • Front camera
  • Surround-view system ECU

Simplified Schematic

Block Diagram - Texas Instruments TPS3436-Q1 Precision Window-Watchdog Timer
Published: 2023-09-06 | Updated: 2023-09-14