µP Voltage Monitor with Dual Over/Undervoltage Detection

Microprocessor Voltage Monitor with Dual Over/Undervoltage Detection
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Active: In Production.


The ICL7665 warns microprocessors (µPs) of overvoltage and undervoltage conditions. It draws a typical operating current of only 3µA. The trip points and hysteresis of the two voltage detectors are individually programmed via external resistors to any voltage greater than 1.3V. The ICL7665 will operate from any supply voltage in the 1.6V to 16V range, while monitoring voltages from 1.3V to several hundred volts. The Maxim ICL7665A is an improved version with a 2%-accurate VSET1 threshold and guaranteed performance over temperature.

The 3µA quiescent current of the ICL7665 makes it ideal for voltage monitoring in battery-powered systems. In both battery- and line-powered systems, the unique combination of a reference, two comparators, and hysteresis outputs reduces the size and component count of many circuits.

Data Sheet

Download this datasheet in PDF formatDownload Rev 2 (PDF, 128kB)
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Key Features

  • µP Over/Undervoltage Warning
  • Improved Second Source
  • Dual Comparator with Precision Internal Reference
  • 3µA Operating Current
  • 2% Threshold Accuracy (ICL7665A)
  • 1.6V to 16V Supply Voltage Range
  • On-Board Hysteresis Outputs
  • Externally Programmable Trip Points
  • Monolithic, Low-Power CMOS Design


  • µP Voltage Monitoring
  • Battery-Backup Switching
  • High/Low Temperature, Pressure, Voltage Alarms
  • Low-Battery Detection
  • Over/Undervoltage Protection
  • Power Supply Fault Monitoring
  • Power-Fail and Brownout Detection

Key Specifications:

Supervisors (2 Monitored Voltages)
Part Number Interface Reset Thresh.
Reset Out tRESET Watchdog Feature Supervisor Features Reset Thresh. Accur.
min @ +25°C max See Notes
ICL7665  R/C Adjustable
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active High
Active Low
Open Drain
<1ms No Watchdog
Adjustable Reset Input
Overvoltage/Window Monitor
2 15 $2.73 @1k
See All Supervisors (2 Monitored Voltages) (84)

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.


ICL7665: Typical Operating Circuit
Typical Operating Circuit

Notes and Comments

Dual channel: one inverting, one noninverting

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Information Index

Document Ref.: 19-0001 Rev 2; 1997-08-01
This page last modified: 2007-05-31