MAX801N

19-1086; Rev 1; 11/05 MAX801L/M/N, MAX808L/M/N 8-Pin µP Supervisory Circuits with ±1.5% Reset Accuracy _______________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 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 Controllers Intelligent Instruments Critical µP Power Monitoring Portable/Battery-Powered Equipment Embedded Systems Pin Configurations appear at end of data sheet. __________Typical Operating Circuit +5V 0.1μF 0.1μF VCC OUT BATT 0.1μF LOWLINE RESET MAX808 CE IN CE OUT GND POWER FOR μP CMOS RAM POWER NMI RESET µP SYSTEM FROM I/O SYSTEM OR ADDRESS DECODER TO CMOS RAM ____________________________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...