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.
Features
♦Precision Supply-Voltage Monitor:
4.65V for MAX690A/MAX802L/MAX805L
4.40V for MAX692A/MAX802M
♦Reset Time Delay – 200ms
♦Watchdog Timer – 1.6sec 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)
