6-Pin µP Reset Circuit with Power-Fail Comparator

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The MAX6342-MAX6345 family of microprocessor (µP) supervisory circuits monitors power supplies in digital systems. These devices significantly improve system reliability and accuracy compared to separate ICs or discrete components.

The MAX6342-MAX6345 provide factory-trimmed VCC reset threshold voltages from 2.33V to 4.63V and operate with supply voltages between +1V and +5.5V. A +1.25V threshold detector allows for a power-fail warning, for low-battery detection, or for monitoring another power supply. The MAX6342 contains an active-low MR input and an active-low push-pull reset. The MAX6343 and MAX6344 are identical to the MAX6342 except they provide an active-low, open-drain reset and an active-high, push-pull reset, respectively. The MAX6345 provides a second reset output in place of the active-low MR input to give it an active-high push-pull reset and an active-low push-pull reset.

All of the devices are packaged in a miniature 6-pin SOT23.
MAX6342, MAX6343, MAX6344, MAX6345: Typical Operating Circuit MAX6342, MAX6343, MAX6344, MAX6345: Typical Operating Circuit Enlarge+

Key Features

  • Small 6-Pin SOT23 Package
  • Precision Factory-Set VCC Reset Thresholds Between 2.33V and 4.63V
  • Guaranteed Active-Low RESET Valid to VCC = +1V
  • 100ms min Reset Pulse Width
  • Debounced CMOS-Compatible Manual-Reset Input
  • Voltage Monitor for Power-Fail or Low-Battery Warning


  • Embedded Control Systems
  • Multivoltage Systems
  • Network Equipment
  • Portable Battery-Powered Equipment
  • Portable Computing
  • Telecom Equipment
Product Reliability Reports: MAX6344.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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