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

1.5% Accurate Reset ICs with Battery-Backup

Please check latest availability status for a specific part variant.


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 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 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


  • Computers: Desktop, Workstation, Server
  • Controllers
  • Critical µP Monitoring
  • Embedded Systems
  • Intelligent Instruments
  • Portable Battery-Powered Equipment
Part NumberReset Thresh.
Reset OutICC
Oper. Temp.
maxSee Notes
4.0 to 4.5
4.5 to 5.0
Active High
Active Low
-40 to +85
0 to +70
SOIC (N)/8
$5.04 @1k
Active Low
SOIC (N)/8
$3.61 @1k
See All Battery Backup Circuits (81)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Quality and Environmental Data

Request Reliability Report for: MAX801L 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >


Related Resources

High-Precision Supervisory with Window Watchdog and Overvoltage Indicator

  • ±1% Accuracy
  • Enables ASIL Compliance at System Level
  • 0.5V to 5V Threshold Range with 20mV Increments

High-Accuracy 4-Channel, Any-Input Supervisory Circuits

  • Valid Active-Low RESET Logic State for Any Input Above 1V
  • ±1% Accuracy for All Inputs
  • Low 17μA Supply Current