µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset

Industry's-First µP Supervisory with Windowed Watchdog and Manual Reset

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The MAX6323/MAX6324 microprocessor (µP) supervisory circuits monitor power supplies and µP activity in digital systems. A watchdog timer looks for activity outside an expected window of operation. Six laser-trimmed reset thresholds are available with ±2.5% accuracy from +2.32V to +4.63V. Valid active-low RESET output is guaranteed down to VCC = +1.2V.

The active-low RESET output is either push-pull (MAX6323) or open-drain (MAX6324). active-low RESET is asserted low when VCC falls below the reset threshold, or when the manual reset input (active-low MR) is asserted low. active-low RESET remains asserted for at least 100ms after VCC rises above the reset threshold and active-low MR is deasserted.

The watchdog pulse output (active-low WDPO) utilizes an open-drain configuration. It can be triggered either by a fast timeout fault (watchdog input pulses are too close to each other) or a slow timeout fault (no watchdog input pulse is observed within the timeout period). The watchdog timeout is measured from the last falling edge of watchdog input (WDI) with a minimum pulse width of 300ns. Active-low WDPO is asserted for 1ms when a fault is observed. Eight laser-trimmed timeout periods are available.

The MAX6323/MAX6324 are offered in a 6-pin SOT23 package and operate over the extended temperature range (-40°C to +125°C).
MAX6323, MAX6324: Typical Operating Circuit MAX6323, MAX6324: Typical Operating Circuit Enlarge+

Key Features

  • Min/Max (Windowed) Watchdog, 8 Factory-Trimmed Timing Options
  • Pulsed Open-Drain, Active-Low Watchdog Output
  • Power-On Reset
  • Precision Monitoring of +2.5V, +3.0V, +3.3V, and +5.0V Power Supplies
  • Open-Drain or Push-Pull Active-Low RESET Outputs
  • Low-Power Operation (23µA typ)
  • Debounced Manual Reset Input
  • Guaranteed Reset Valid to VCC = +1.2V
  • AEC-Q100 Qualified MAX6324HUT44/V+T


  • Automotive
  • Embedded Control Systems
  • Industrial
  • Medical
Part NumberReset Thresh.
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
min@ +25°CmaxSee Notes
2.5 to 3.3
3.3 to 5.5
Active Low
85ms to 300ms
Input/Output (WDI/WDO)
1s to 2s
Manual Reset1.545
$1.96 @1k
Active Low
Open Drain
See All Supervisors (1 Monitored Voltage) (261)
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.

Technical Documents

Tutorial 1926 Watchdogs Improve System Reliability—How to Choose the Right Part
App Note 1070 Windowed Watchdog Enhances µP Supervisors

Quality and Environmental Data

Product Reliability Reports: MAX6324.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • MAX6324 PSPICE Macromodel
  • CAD Symbols and Footprints

  • MAX6324AUT23+T
  • MAX6324AUT23-T
  • MAX6324AUT26+T
  • MAX6324AUT26-T
  • MAX6324AUT29+
  • MAX6324AUT29+T
  • MAX6324AUT29-T
  • MAX6324AUT31+
  • MAX6324AUT31+T
  • MAX6324AUT31-T
  • MAX6324AUT44+T
  • MAX6324AUT44-T
  • MAX6324AUT46+
  • MAX6324AUT46+T
  • MAX6324AUT46-T
  • MAX6324BUT23+T
  • MAX6324BUT23-T
  • MAX6324BUT26+T
  • MAX6324BUT26-T
  • MAX6324BUT29+
  • MAX6324BUT29+T
  • MAX6324BUT29-T
  • MAX6324BUT31+
  • MAX6324BUT31+T
  • MAX6324BUT31-T
  • MAX6324BUT44+T
  • MAX6324BUT44-T
  • MAX6324BUT46+
  • MAX6324BUT46+T
  • MAX6324BUT46-T
  • MAX6324CUT23+T
  • MAX6324CUT23-T
  • MAX6324CUT26+T
  • MAX6324CUT26-T
  • MAX6324CUT29+T
  • MAX6324CUT29-T
  • MAX6324CUT31+T
  • MAX6324CUT31-T
  • MAX6324CUT44+T
  • MAX6324CUT44-T
  • MAX6324CUT46+T
  • MAX6324CUT46-T
  • MAX6324DUT23+T
  • MAX6324DUT23-T
  • MAX6324DUT26+T
  • MAX6324DUT26-T
  • MAX6324DUT29+T
  • MAX6324DUT29-T
  • MAX6324DUT31+T
  • MAX6324DUT31-T
  • MAX6324DUT44+T
  • MAX6324DUT44-T
  • MAX6324DUT46+T
  • MAX6324DUT46-T
  • MAX6324EUT23+T
  • MAX6324EUT23-T
  • MAX6324EUT26+T
  • MAX6324EUT26-T
  • MAX6324EUT29+
  • MAX6324EUT29+T
  • MAX6324EUT29-T
  • MAX6324EUT31+T
  • MAX6324EUT31-T
  • MAX6324EUT44+T
  • MAX6324EUT44-T
  • MAX6324EUT46+
  • MAX6324EUT46+T
  • MAX6324EUT46-T
  • MAX6324FUT23+T
  • MAX6324FUT23-T
  • MAX6324FUT26+
  • MAX6324FUT26+T
  • MAX6324FUT26-T
  • MAX6324FUT29+T
  • MAX6324FUT29-T
  • MAX6324FUT31+T
  • MAX6324FUT31-T
  • MAX6324FUT44+T
  • MAX6324FUT44-T
  • MAX6324FUT46+
  • MAX6324FUT46+T
  • MAX6324FUT46-T
  • MAX6324GUT23+T
  • MAX6324GUT23-T
  • MAX6324GUT26+T
  • MAX6324GUT26-T
  • MAX6324GUT29+
  • MAX6324GUT29+T
  • MAX6324GUT29-T
  • MAX6324GUT31+T
  • MAX6324GUT31-T
  • MAX6324GUT44+T
  • MAX6324GUT44-T
  • MAX6324GUT46+
  • MAX6324GUT46+T
  • MAX6324GUT46-T
  • MAX6324HUT23+
  • MAX6324HUT23+T
  • MAX6324HUT23-T
  • MAX6324HUT26+T
  • MAX6324HUT26-T
  • MAX6324HUT29+
  • MAX6324HUT29+T
  • MAX6324HUT29-T
  • MAX6324HUT31+T
  • MAX6324HUT31-T
  • MAX6324HUT44+
  • MAX6324HUT44+T
  • MAX6324HUT44-T
  • MAX6324HUT44/V+
  • MAX6324HUT44/V+T
  • MAX6324HUT46+
  • MAX6324HUT46+T
  • MAX6324HUT46-T
  • 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 >


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