General Description
The MAX16033–MAX16040 supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery control functions in microprocessor (µP) systems. The devices significantly improve system reliability and accuracy compared to other ICs or discrete components. The MAX16033–MAX16040 provide µP reset, backup-battery switchover, power-fail warning, watchdog, and chip-enable gating features.

Features
♦ Low 1.2V Operating Supply Voltage
♦ Precision Monitoring of 5.0V, 3.3V, 3.0V, and 2.5V Power-Supply Voltages
♦ Independent Power-Fail Comparator
♦ Debounced Manual-Reset Input
♦ Watchdog Timer, 1.6s Timeout
♦ Battery-On Output Indicator
♦ Auxiliary User-Adjustable RESETIN
♦ Low 13µA Quiescent Supply Current
♦ Two Available Output Structures:
   Active-Low Push-Pull Reset
   Active-Low Open-Drain Reset
♦ Active-Low Reset Valid Down to 1.2V
♦ Power-Supply Transient Immunity
♦ 140ms (min) Reset Timeout Period
♦ Small 2mm x 2mm, 8-Pin and 10-Pin µDFN Packages

Applications
   Portable/Battery Powered Equipment
   POS Equipment
   Critical µP/µC Power Monitoring
   Set-Top Boxes
   Controllers
   Computers
   Fax Machines
   Industrial Control
   Real-Time Clocks
   Intelligent Instrument