µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay

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The MAX6746–MAX6753 low-power microprocessor (µP) supervisory circuits monitor single/dual system supply voltages from 1.575V to 5V and provide maximum adjustability for reset and watchdog functions. These devices assert a reset signal whenever the VCC supply voltage or RESET IN falls below its reset threshold or when manual reset is pulled low. The reset output remains asserted for the reset timeout period after VCC and RESET IN rise above the reset threshold. The reset function features immunity to power-supply transients.

The MAX6746–MAX6753 have ±2% factory-trimmed reset threshold voltages in approximately 100mV increments from 1.575V to 5.0V and/or adjustable reset threshold voltages using external resistors.

The reset and watchdog delays are adjustable with external capacitors. The MAX6746–MAX6751 contain a watchdog select input that extends the watchdog timeout period by 128x. The MAX6752/MAX6753 contain a window watchdog timer that looks for activity outside an expected window of operation.

The MAX6746–MAX6753 are available with a push-pull or open-drain active-low RESET output. The MAX6746–MAX6753 are available in an 8-pin SOT23 package and are fully specified over the automotive temperature range (-40°C to +125°C).

Design Solution: Build in Automotive Insurance with Supervisor and Watchdog Policies ›

MAX6746, MAX6747, MAX6748, MAX6749, MAX6750, MAX6751: Typical Operating Circuit MAX6746, MAX6747, MAX6748, MAX6749, MAX6750, MAX6751: Typical Operating Circuit Enlarge+

Key Features

  • Configurable Reset and Watchdog Options EnablesWide Variety of Applications
    • Factory-Set Reset Threshold Options from 1.575V to 5V in ~ 100mV Increments
    • Adjustable Reset Threshold Options
    • Single/Dual Voltage Monitoring
    • Capacitor-Adjustable Reset Timeout
    • Capacitor-Adjustable Watchdog Timeout
    • Min/Max (Windowed) Watchdog Option
    • Manual-Reset Input Option
    • Push-Pull or Open-Drain Active-Low RESET Output Options
  • 3.7µA Supply Current Reduces System Power Consumption
  • Integrated Power Supply Protection Increases Robustness
    • Power-Supply Transient Immunity
    • Guaranteed Active-Low RESET Valid for VCC ≥ 1V
  • 8-Pin SOT23 Packages Saves Board Space
  • AEC-Q100 Qualified. Refer to Ordering Information for Specific /V Trim Variants


  • Automotive
  • Battery-Powered Computers/Controllers
  • Computers
  • Critical µP Monitoring
  • Embedded Controllers
  • Intelligent Instruments
  • Medical Equipment
  • Portable Equipment
  • Set-Top Boxes

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.
Product Reliability Reports: MAX6747.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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.

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