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Dual, Ultra-Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Monitor Primary VCC Supplies from +1.8V to +5.0V and Secondary VCC2 Supplies from +0.9V to +2.5V
  • User Adjustable RESET IN Down to +0.63V (MAX6826/MAX6827/MAX6828)
  • 140ms (min) Reset Timeout Delay
  • 1.6s Watchdog Timeout Period
  • Manual Reset Input
  • Three Reset Output Options
    • Push-Pull active-low RESET
    • Push-Pull RESET
    • Open-Drain active-low RESET
  • Guaranteed Reset Valid Down to VCC = +1.0V
  • Immune to Short Negative VCC Transients
  • No External Components
  • Small 6-pin SOT23 Packages

Applications/Uses

  • Critical µP Monitoring
  • Embedded Controllers
  • Intelligent Instruments
  • Multivoltage Systems
  • Portable/Battery-Powered Equipment

Description

The MAX6826—MAX6831 are ultra-low-voltage microprocessor (µP) supervisory circuits designed to monitor two power supplies and have manual reset and watchdog input functions. These devices assert a system reset if any of the monitored supplies fall below the preprogrammed thresholds, and maintain reset for a minimum timeout period after the supplies rise above the threshold. Microprocessor supervisors significantly improve system reliability and accuracy compared to separate ICs or discrete components. These devices monitor primary voltages from +1.8V to +5.0V and secondary voltages from +0.9V to +2.5V. These devices are guaranteed to be in the correct state for VCC down to +1.0V.

A variety of preprogrammed reset threshold voltages are available (see the Threshold Suffix Guide). The devices include manual reset and watchdog inputs. The MAX6829/MAX6830/MAX6831 provide a factory-trimmed threshold to monitor a 2nd voltage down to +0.9V. The MAX6826/MAX6829 have a push-pull active-low RESET, the MAX6827/MAX6830 have a push-pull RESET and the MAX6828/MAX6831 have an open-drain active-low RESET. The MAX6826/MAX6827/MAX6828 have an auxiliary monitor that allows user adjustable input to monitor voltages down to +0.6V. See Selector Guide for functions available.

Simplified Block Diagram

MAX6826, MAX6827, MAX6828, MAX6829, MAX6830, MAX6831: Typical Operating Circuit MAX6826, MAX6827, MAX6828, MAX6829, MAX6830, MAX6831: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.