MAX690A/MAX692A/MAX802L/MAX802M/MAX805L Supervisory Circuits, reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems
The MAX690A, MAX692A, MAX802L, MAX802M, and MAX805L are microprocessor supervisory circuits that provide reset, battery‑backup switching, watchdog timer, and low‑voltage detection functions. They reduce component count and improve reliability for battery‑powered computers, controllers, automotive systems, and other critical uP applications.
Key features include a 4.65 V (MAX690A/802L/805L) or 4.40 V (MAX692A/802M) reset‑voltage threshold, a 200 ms reset pulse width, a 1.6 s watchdog timeout, and power‑fail accuracy guaranteed to ±2 %. The devices are offered in 8‑pin DIP and SO packages with a typical quiescent supply current of 200 pA.
| Reset voltage threshold (MAX690A/802L/805L) | 4.65 V |
|---|---|
| Reset pulse width | 200 ms |
| Watchdog timer timeout | 1.6 s |
| Quiescent supply current (typical) | 200 pA |
| Power‑fail accuracy | ±2 % |
The MAX690A resets when the supply voltage falls below 4.65 V.
The reset pulse width is specified as 200 ms.
The internal watchdog timer triggers a reset after 1.6 seconds of inactivity.
Typical quiescent supply current is 200 pA.