The ADM690A/ADM692A/ADM802L/M/ADM805L/M family of supervisory circuits offers complete single chip solutions for power supply monitoring, reset functionality, watchdog timer, and automatic battery backup power switching.
The ADM690A, ADM692A, ADM802L/M and ADM805L/M family offers precision supply‑voltage monitoring, reset assertion down to 1 V, watchdog timer, battery‑backup switching and power‑fail detection. The devices are supplied in 8‑pin DIP, SOIC and a space‑saving microSOIC package and are intended for microprocessor systems, computers, controllers and intelligent instruments.
The document includes detailed electrical specifications, absolute‑maximum ratings, pin‑out diagrams, functional block diagrams, typical performance curves and application examples such as battery‑backup RAM power and watchdog monitoring. It also describes how to add hysteresis to the power‑fail comparator and how to configure the bidirectional reset output.
| Operating Voltage Range (Voc) | 1.0 V – 5.5 V |
|---|---|
| Supply Current (Excludes Iout) | 70 pA min, 100 pA typ |
| Supply Current in Battery Backup Mode | 0.05 pA min, 1.0 pA typ |
| Reset Timeout Delay | 140 ms – 200 ms – 280 ms |
| Watchdog Timeout Period | 1.0 s – 1.6 s – 2.25 s |
| Power‑Fail Input Threshold (PFI) | 1.20 V – 1.25 V – 1.30 V |
| Reset Voltage Threshold (ADM690A, ADM802L, ADM805L) | 4.5 V – 4.65 V – 4.75 V |
| Package Types | 8‑pin DIP, SOIC, microSOIC |
The reset voltage threshold for the ADM690A ranges from 4.5 V to 4.75 V, with a typical value of 4.65 V.
The watchdog timer timeout period is specified as 1.0 s minimum, 1.6 s typical, and 2.25 s maximum.
The devices are offered in 8‑pin DIP, SOIC and a space‑saving microSOIC package.