The TPS3436-Q1 (wireless operation) features ultra-low power consumption (250nA typical) and offers a programmable window watchdog timer. The TPS3436-Q1 offers a high accuracy window watchdog timer with host of features for a wide variety of applications. The close window timer can be factory programmed and 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 advanced features such as enable-disable, start-up delay. The watchdog output (WDO) delay can be set by factory-programmed default delay settings and programmed by an external capacitor. The device also offers a latched output operation where the output remains latched until the watchdog fault clears. The TPS3436-Q1 provides a performance upgrade alternative to TPS3430-Q1 device family. The TPS3436-Q1 comes in a small 8-pin SOT-23 package.

Figure 2-2 TPS3436-Q1 Block Diagram

Key features of the TPS3436-Q1 include:

• 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: 1ms to 100s
• Factory programmed or user-programmable reset delay:
  • ±10% accurate timer (maximum)
  • Factory programmed option: 2ms to 10s

• Input voltage range: V_DD = 1.04V to 6.0V
• Ultra low supply current: I_DD = 250nA (typical)
• Open-drain, push-pull; active-low outputs
• Various programmability options:
  • Watchdog enable-disable
  • Watchdog start-up delay: no delay to 10s
  • Open window to close window ratio option: 1 × to 511 ×
  • Latched output option
• MR functionality support