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