The MAX792/MAX820 microprocessor (µP) supervisory circuits provide the most functions for power-supply and watchdog monitoring in systems without battery backup. Built-in features include µP reset, manual-reset input, two-stage power-fail warning, watchdog fault output, pulsed watchdog output, and write protection of CMOS RAM, EEPROM, or other memory devices.
The MAX792 and MAX820 are microprocessor supervisory circuits that provide power‑supply and watchdog monitoring for systems without battery backup. They include µP reset, manual‑reset input, two‑stage power‑fail warning, watchdog fault and pulse outputs, and write‑protect for CMOS RAM, EEPROM or other memory devices.
The document details electrical specifications, pin descriptions, typical operating characteristics, and guidance for configuring internal versus external threshold modes, as well as chip‑enable gating and timing diagrams for reset and watchdog functions.
| Input Voltage (VCC) | -0.3 V to +6 V |
|---|---|
| Reset Threshold Voltage (Internal Mode) | 4.62 V (typ) |
Connect the RESET IN/INT pin to ground; this selects internal threshold mode and uses the factory‑preset low‑line and reset thresholds.
Reset is guaranteed to remain valid down to a VCC of 1 V.