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

 

Part Number	Replacement	Explanation

Description

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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.

MAX801L, MAX801M, MAX801N, MAX808L, MAX808M, MAX808N: Typical Operating Circuit Enlarge+

Key Features

• 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 V_CC Mode
  • 20mA in Battery-Backup Mode
• MaxCap™/SuperCap™ Compatible
• Active-low RESET Guaranteed Valid to V_CC = 1V
• Low-Line Threshold 52mV Above Reset Threshold

Applications/Uses

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