This document describes the features and characteristics of the ADM8696/ADM8697 microprocessor supervisory circuits, including adjustable low voltage monitoring, power OK/reset time delay, watchdog timer, automatic battery backup switching, etc.
The ADM8696 and ADM8697 are single‑chip supervisory circuits that provide power‑on reset, watchdog timer, battery backup switching, and voltage monitoring for microprocessor systems. They are offered in 16‑pin DIP and thin‑shrink TSSOP packages and support reset operation down to 1 V VCC.
The document includes functional block diagrams, absolute maximum ratings, ordering information, pin‑out tables, and detailed circuit descriptions such as chip‑enable gating, RAM write protection, and power‑fail comparator operation. Typical performance curves and dimension drawings are also provided.
| Operating Voltage Range (Vec) | 3.0 V to 5.5 V |
|---|---|
| Low Line Threshold (LLyy) | 1.25 V to 1.35 V |
| Reset Timeout Delay | 35 ms to 70 ms |
| Watchdog Timeout Period (internal oscillator) | 1.0 s to 2.25 s |
The watchdog timer can be set to a fixed short period of 100 ms, a long period of 1.6 s, or an adjustable period using an external clock or capacitor.