High-Accuracy µP Reset Circuit

µP Supervisor Provides the Highest Accuracy at 1%

Please check latest availability status for a specific part variant.


The MAX6394 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. It offers excellent circuit reliability by providing 1% accurate thresholds over temperature and by eliminating external components and adjustments. The MAX6394 also provides a debounced manual reset input.

This device performs a single function: it asserts a reset signal whenever the VCC supply voltage falls below a preset threshold or whenever manual reset is asserted. Active-low RESET remains asserted for an internally programmed interval (reset timeout period) after VCC has risen above the reset threshold or manual reset is deasserted. The MAX6394's open-drain active-low RESET output can be pulled up to a voltage higher than VCC.

The MAX6394 comes with factory-trimmed reset threshold voltages from 2.4V to 4.8V. Preset timeout periods of 0.7ms, 14ms, 105ms, and 826ms are also available. The device comes in a SOT143 package.
MAX6394: Typical Operating Circuit MAX6394: Typical Operating Circuit Enlarge+

Key Features

  • ±0.6% Threshold Accuracy at TA = +25°C
  • ±1.0% Threshold Accuracy from -40°C to +125°C
  • Small SOT143 Package
  • Open-Drain Active-Low RESET Output Can Exceed VCC
  • Precision, Factory-Set VCC Reset Thresholds: Nine Options from 2.4V to 4.8V
  • Four Reset Timeout Periods Available: 0.7ms, 14ms, 105ms, and 826ms (minimum)
  • Immune to Short VCC Transients
  • 5µA Supply Current
  • AEC-Q100 Qualified, Refer to Ordering Information for Specific /V Part


  • Computers
  • Controllers
  • Critical µP and µC Power Monitoring
  • Intelligent Instruments
  • Portable/Battery-Powered Equipment

See parametric specs for Supervisors (1 Monitored Voltage) (250)

Part NumberReset Thresh.
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
min@ +25°CmaxSee Notes
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
1ms to 15ms
85ms to 300ms
300ms to 1s
No WatchdogManual Reset0.615
$1.78 @1k

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: MAX6394.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.

Quality Management System >
Environmental Management System >


Related Resources