The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components. These parts provide four functions: 1) A reset output during power-up, power-down, and brownout conditions. 2) Battery-backup switching for CMOS RAM, CMOS µP, or other low-power logic. 3) A reset pulse if the optional watchdog timer has not been toggled within 1.6sec. 4) A 1.25V threshold detector for power-fail warning or low-battery detection, or to monitor a power supply other than +5V. The parts differ in their reset-voltage threshold levels and reset outputs. The MAX690A/MAX802L/MAX805L generate a reset pulse when the supply voltage drops below 4.65V, and the MAX692A/MAX802M generate a reset below 4.40V. The MAX802L/MAX802M guarantee power-fail accuracies to ±2%. The MAX805L is the same as the MAX690A except that RESET is provided instead of active-low RESET. All parts are available in 8-pin DIP and SO packages. The MAX690A/MAX802L are pin compatible with the MAX690 and MAX694. The MAX692A/MAX802M are pin compatible with the MAX692. Applications * Battery-Powered Computers/Controllers * Critical µP Monitoring * Intelligent Instruments * Precision Supply Voltage Monitor: * 4.65V for MAX690A/MAX802L/MAX805L * 4.40V for MAX692A/MAX802M * Reset Time Delay: 200ms * Watchdog Timer: 1.6s Timeout * Battery-Backup Power Switching * 200µA Quiescent Supply Current * 50nA Quiescent Supply Current in Battery-Backup Mode * Voltage Monitor for Power-Fail or Low-Battery Warning * Power-Fail Accuracy Guaranteed to ±2% (MAX802L/M) * Guaranteed Active-Low RESET Assertion to VCC = 1V * 8-Pin SO and DIP Packages https://elecena.pl/product/22332400/microprocessor-supervisory-circuits 2022-12-28 https://elecena.pl/product/22332400/microprocessor-supervisory-circuits 2025-01-22