8-Pin µP Supervisory Circuits with ±1.5% Reset Accuracy

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 watchdog for the MAX801 and CMOS RAM write protection for the MAX808.

The MAX801/MAX808 offer a choice of reset-threshold voltage (denoted by suffix letter): 4.675V (L), 4.575V (N), and 4.425V (M). These devices are available in 8-pin DIP and SO packages.

Applications

* Computers: Desktop, Workstation, Server * Controllers * Critical µP Monitoring * Embedded Systems * Intelligent Instruments * Portable Battery-Powered Equipment

* Precision Voltage Monitoring, ±1.5% Reset Accuracy

* 200ms Power-OK/Reset Time Delay

* Active-low RESET Output (MAX808)

* RESET and active-low 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

* Active-low RESET Guaranteed Valid to VCC = 1V

* Low-Line Threshold 52mV Above Reset Threshold