MAX792

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 the following:

• µP reset: Assertion of RESET and active-low RESET outputs during power-up, power-down, and brownout conditions. Active-low RESET is guaranteed valid for V_CC down to 1V.
• Manual-reset input.
• Two-stage power-fail warning: A separate low-line comparator compares V_CC to a preset threshold 120mV above the reset threshold; the low-line and reset thresholds can be programmed externally.
• Watchdog fault output: Assertion of active-low WDO if the watchdog input is not toggled within a preset timeout period.
• Pulsed watchdog output: Advance warning of impending active-low WDO assertion from watchdog timeout that causes hardware shutdown.
• Write protection of CMOS RAM, EEPROM, or other memory devices.

The MAX792 and MAX820 are identical, except the MAX820 guarantees higher low-line and reset threshold accuracy (±2%).

Applications

• Computers: Desktop, Workstation, Server
• Controllers
• Critical µP Monitoring
• Intelligent Instruments