General Description
The MAX791 microprocessor (µP) supervisory circuit reduces the complexity and number of components needed to monitor power-supply and battery-control functions in µP systems. The 50µA supply current makes the MAX791 ideal for use in portable equipment, while the 6ns chip-enable propagation delay and 250mA output capability (25mA in battery-backup mode) make it suitable for larger, higher-performance equipment.

Features
♦ Precision 4.65V Voltage Monitoring
♦ 200ms Power-OK/Reset Time Delay
♦ Independent Watchdog Timer—Preset or Adjustable
♦ 1µA Standby Current
♦ Power Switching
    250mA Output in VCC Mode
    25mA Output in Battery-Backup Mode
♦ On-Board Gating of Chip-Enable Signals
    Memory Write-Cycle Completion
    6ns CE Gate Propagation Delay
♦ MaxCap or SuperCap Compatible
♦ Voltage Monitor for Power-Fail or Low-Battery Warning
♦ Backup-Battery Monitor
♦ Guaranteed –R—E—S—E—T– Valid to VCC = 1V

Applications
    Computers
    Critical µP Power Monitoring
    Controllers
    Intelligent Instruments
    Portable/Battery Powered Equipment