The ADM690-ADM695 Microprocessor Supervisory Circuits are single-chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning. The complete family provides a variety of configurations to satisfy most microprocessor system requirements.
The ADM690‑ADM695 family provides power‑supply monitoring, battery backup switching, watchdog timer and RAM write‑protection for microprocessor systems. The devices are offered in 8‑pin DIP (ADM690, ADM692, ADM694) and 16‑pin DIP/SO (ADM691, ADM693, ADM695) packages.
Key functions include a reset output that stays active down to 1 V, a high‑current (up to 100 mA) Vout driver, adjustable watchdog timeout periods, and fast chip‑enable gating (5 ns). The document lists electrical specifications, pin configurations, functional block diagrams and application notes for automotive, industrial and consumer electronics.
| Watchdog Timeout Period (internal oscillator) | 1.0 s – 2.25 s (typical 1.6 s) |
|---|---|
| Supply Current (no battery backup) | 1.95 mA @ 100 mA load |
The Vout pin can supply up to 100 mA, allowing direct drive of CMOS RAM or other low‑power logic.
The internal watchdog timer defaults to 1.6 s, but can be set to a short 100 ms period or adjusted via external clock or capacitor.