Microprocessor Monitor

Improved MAX1232 Cuts Power Consumption by 10X
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Active: In Production.


The MAX1232 microprocessor (µP) supervisory circuit provides µP housekeeping and power-supply supervision functions while consuming only 1/10th the power of the DS1232. The MAX1232 enhances circuit reliability in µP systems by monitoring the power supply, monitoring the software execution, and providing a debounced manual reset input. The MAX1232 is a plug-in upgrade of the Dallas DS1232.

A reset pulse of at least 250ms duration is supplied on power-up, power-down, and low-voltage brownout conditions (5% or 10% supply tolerances can be selected digitally). Also featured is a debounced manual reset input that forces the reset outputs to their active states for a minimum of 250ms. A digitally programmable watchdog timer monitors software execution and can be programmed for timeout settings of 150ms, 600ms, or 1.2s. The MAX1232 requires no external components.

Data Sheet

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Key Features

  • Consumes 1/10th the Power of the DS1232
  • Precision Voltage Monitor—Adjustable +4.5V or +4.75V
  • Power-OK/Reset Pulse Width—250ms Min
  • No External Components
  • Adjustable Watchdog Timer—150ms, 600ms, or 1.2s
  • Debounced Manual Reset Input for External Override
  • Available in 8-Pin PDIP/SO and 16-Pin Wide SO Packages


  • Automotive Systems
  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments

Key Specifications:

Supervisors (1 Monitored Voltage)
Part Number Reset Thresh.
Reset Out tRESET Watchdog Feature Watchdog Timeout Supervisor Features Reset Thresh. Accur.
min @ +25°C max See Notes
MAX1232  3.3 to 5.5
Active High
Active Low
Open Drain
85ms to 300ms Input (WDI)
1s to 2s
Manual Reset 2.5 200 $1.77 @1k
See All Supervisors (1 Monitored Voltage) (275)

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.


MAX1232: Typical Operating Circuit
Typical Operating Circuit

Notes and Comments

Microprocessor Monitor with Watchdog

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Document Ref.: 19-3899 Rev 1; 2006-06-27
This page last modified: 2009-11-10