General Description

The MAX807 microprocessor (µP) supervisory circuit reduces the complexity and number of components needed to monitor power-supply and battery-control functions in µP systems. A 70µA supply current makes the MAX807 ideal for use in portable equipment, while a 2ns chip-enable propagation delay and 250mA output current capability (20mA in battery-backup mode) make it suitable for larger, higher-performance equipment.

Features

♦ Precision 4.675V (MAX807L), 4.425V (MAX807M),

    or 4.575V (MAX807N) Voltage Monitoring

♦ 200ms Power-OK/Reset Time Delay

♦ RESET and RESET Outputs

♦ Independent Watchdog Timer

♦ 1µA Standby Current

♦ Power Switching

    250mA in VCC Mode

    20mA in Battery-Backup Mode

♦ On-Board Gating of Chip-Enable Signals;

    2ns CE Gate Propagation Delay

♦ MaxCap® and SuperCap® Compatible

♦ Voltage Monitor for Power Fail

♦ Backup-Battery Monitor

♦ Guaranteed RESET Valid to VCC = 1V

♦ ±1.5 Low-Line Threshold Accuracy 52mV above

    Reset Threshold

Applications

    Computers

    Controllers

    Intelligent Instruments

    Critical µP Power Monitoring

    Portable/Battery-Powered Equipment