A1252WR-SF

Supervisory Circuits with Windowed Watchdog and Manual Reset in 5-Lead SOT-23 Data Sheet FEATURES Windowed watchdog, 8 timeout options 26 reset threshold options 2.5 V to 5 V in 100 mV increments 4 reset timeout options 1 ms, 20 ms, 140 ms, and 1120 ms (minimum) Manual reset input Open-drain or push-pull RESET outputs Low power consumption Specified over wide temperature range (−40°C to +125°C) Qualified for automotive applications 5-lead SOT-23 package ADM8323 VCC VCC VREF ADM8323/ADM8324 FUNCTIONAL BLOCK DIAGRAMS RESET GENERATOR RESET MR DEBOUNCE WINDOWED WATCHDOG DETECTOR 11802-001 GND WDI Figure 1. APPLICATIONS Automotive Microprocessor systems Computers Controllers Intelligent instruments Portable equipment VCC ADM8324 VREF RESET GENERATOR RESET MR DEBOUNCE WINDOWED WATCHDOG DETECTOR 11802-002 Free Datasheet http://www.Datasheet4U.com GND WDI Figure 2. GENERAL DESCRIPTION The ADM8323/ADM8324 are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. An on-chip watchdog timer checks for activity within a preset timeout window. A reset signal can also be asserted by an external push-button switch through a manual reset input. The RESET output is either pushpull (ADM8323) or open-drain (ADM8324). A watchdog failure results in a low output on the RESET pin. A failure can be triggered either by a fast watchdog error (watchdog pulses too close together) or by a slow watchdog error (no watch...