ADM8698/ADM8699 is a microprocessor supervisory circuit that provides power supply monitoring and watchdog timing functions. It features low power consumption, precise voltage monitoring, and reliable reset functionality.
The ADM8698/ADM8699 devices monitor a 5 V supply and generate a RESET pulse during power‑up, power‑down and brown‑out conditions. The RESET output is guaranteed to stay low with VCC as low as 1 V, and the ADM8699 adds a watchdog timer input that forces a reset if not toggled within the timeout period.
Both parts are offered in 8‑pin DIP/SOIC and 16‑lead SOIC packages, with the larger package providing additional non‑inverted RESET and a watchdog output (WDO). Typical application circuits, functional block diagrams, pin descriptions and electrical specifications are provided for system designers.
| Operating Voltage Range | 3.0 V – 5.5 V |
|---|---|
| Supply Current | 70 µA – 100 µA |
| Power‑Down Reset Assertion Voltage | 4.5 V – 4.75 V |
| Reset Active Time | 140 ms – 280 ms |
| Watchdog Timeout Period (ADM8699) | 1.0 s – 2.25 s |
| Reset Output Voltage | 0.4 V |
The RESET output remains low for a minimum of 140 ms after power‑up.
The watchdog timeout period is typically 1.6 seconds.