This document introduces the functional features of the ADM9690 circuit, including voltage monitoring, watchdog timer monitoring, selectable watchdog timeout, and two reset outputs.
The ADM9690 is an 8‑lead SOIC voltage‑monitoring comparator with an integrated watchdog timer. It monitors the 5 V supply of a microprocessor and generates two reset outputs when the supply drops below the threshold or when the watchdog timer expires.
The device offers selectable watchdog timeout periods (0.75 ms to 25 ms) and provides a power‑on reset (RESET 1) of 50 ms and an additional reset (RESET 2) of 10 ms for downstream circuitry.
| Operating Voltage Range | 4.3 V – 5.5 V |
|---|---|
| Supply Current | 55 µA – 100 µA |
| Reset Threshold Hysteresis | 30 mV |
| Reset Timeout Delay (t1) | 50 ms – 75 ms |
| Reset (2) Timeout Delay (t2) | 10 ms – 15 ms |
| Package | 8‑lead narrow‑body SOIC |
It operates from 4.3 V up to 5.5 V.
RESET(1) remains low for 50 ms after the supply voltage rises above the threshold.