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Description

FULL DATA SHEET (PDF, 144kB) Download   E-Mail 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.

Key Features		Applications/Uses
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 Underwriters Laboratories (UL®) Recognized		Computers: Desktop, Workstation, Server Controllers Critical µP Monitoring Embedded Systems Intelligent Instruments Portable Battery-Powered Equipment

Key Specifications:  Battery Backup Circuits
Part Number	Reset Out	Reset Out	ICC (µA)	Features	Industry Qualified	Package/Pins	Smallest Available Pckg. (mm2)	Oper. Temp. (°C)	Price
	Active Low	Active High	max				max w/pins		See Notes
MAX801	Push-Pull	Push-Pull	110	High Accuracy (1%) Low Line Watchdog	Automotive - General	CDIP(N)/8 PDIP(N)/8 SOIC(N)/8	31	-55 to +125 -40 to +85 0 to +70	$3.17 @1k
MAX808		-	90	Chip Enable Gate High Accuracy (1%) Low Line		CDIP(N)/8 PDIP(N)/8 SOIC(N)/8			$3.17 @1k
See All Battery Backup Circuits (86)

Diagram

Typical Operating Circuit

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Document Ref.: 19-1086; Rev 1; 2006-12-05
This page last modified: 2007-07-18