STWD100 Watchdog Timer Circuit

Low-power Watchdog with Chip-Enable Pin Eases Manufacturing Process

STMicroelectronics' watchdog timer circuits are self-contained devices used to detect an out-of-control MCU, thus improving system reliability. The STWD100 prevents system failures caused by certain types of hardware errors (non-responding peripherals, bus contention) or software errors (bad code jump, code stuck in loop). The STWD100 offers low power consumption for minimal impact on system total consumption, a choice of multiple time-out periods for maximum flexibility and comes in small packages simplifying board space optimization.     STWD100 Datasheet STMicroelectronics STWD100 Watchdog Timer Circuit

  Features   Applications
  • Current consumption 13µA typ.
  • Available watchdog timeout periods are 3.4ms, 6.3ms, 102ms, and 1.6s
  • Chip-enable input
  • Open drain or push-pull WDO output
  • Operating temperature range: -40°C to +125°C
  • Package SOT23-5, SC70-5 (SOT323-5)
    RoHS Compliant
  • Security equipment
  • Financial systems
  • Medical equipment
  • Networking devices
  • Communication, computer, consumer, and medical

Part Number
Part Number
Packaging Output Reset
STWD100NPWY3F 497-6841-2-ND Tape & Reel Open Drain or
Open Collector
SOT-23-5, SC-74A, SOT-25
497-6841-1-ND Cut Tape
497-6841-6-ND Digi-Reel®
STWD100NYWY3F 497-10058-2-ND Tape & Reel Open Drain or
Open Collector
SOT-23-5, SC-74A, SOT-25
497-10058-1-ND Cut Tape
497-10058-6-ND Digi-Reel®