General Description

The MAX801/MAX808 microprocessor (µP) supervisory circuits monitor and control the activities of +5V µPs by providing backup-battery switchover, low-line indication, and µP reset. Additional features include a watch dog for the MAX801 and CMOS RAM write protection for the MAX808.

Features

♦ Precision Voltage Monitoring, ±1.5% Reset Accuracy

♦ 200ms Power-OK/Reset Time Delay

♦ RESET Output (MAX808) RESET and RESET Outputs (MAX801)

♦ Watchdog Timer (MAX801)

♦ On-Board Gating of Chip-Enable Signals (MAX808):

  Memory Write-Cycle Completion

  3ns CE Gate Propagation Delay

♦ 1µA Standby Current

♦ Power Switching:

  250mA in VCC Mode

  20mA in Battery-Backup Mode

♦ MaxCap™/SuperCap™ Compatible

♦ RESET Guaranteed Valid to VCC = 1V

♦ Low-Line Threshold 52mV Above Reset Threshold

Applications

Computers

Controllers

Intelligent Instruments

Critical µP Power Monitoring

Portable/Battery-Powered Equipment

Embedded Systems