±1% Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits

1% Accurate Microprocessor Supervisory ICs

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The MAX814/MAX815/MAX816 are high-accuracy microprocessor (µP) supervisory circuits that provide power-on reset, watchdog, and power-fail functions. They eliminate manual trimming and improve reliability in critical applications needing high-accuracy reset thresholds. The active-low RESET output is guaranteed to be in the correct state for VCC down to 1V. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds are available for operation with a variety of 3V and 5V supply voltages.

A 75µA maximum supply current makes the MAX814/MAX815/MAX816 ideal for use in portable equipment. All three devices are available in 8-pin DIP and SO packages. See the Selector Table below for a review of features.
MAX814, MAX815, MAX816: Typical Application Circuits MAX814, MAX815, MAX816: Typical Application Circuits Enlarge+

Key Features

  • ±1% Worst-Case Reset Threshold Accuracy
  • 4.8V, 4.7V, 4.55V, 3.03V, or Adjustable Reset Thresholds
  • ±1% Low-Line Threshold Accuracy (MAX814) 60mV Above Reset Threshold
  • 200ms Reset Time Delay
  • Active-Low RESET Output
  • Active-High RESET Output (MAX814/MAX816)
  • 75µA Max Supply Current
  • Guaranteed active-low RESET Valid to VCC = 1V
  • Manual Reset Input
  • ±2% Power-Fail Comparator
  • Independent Watchdog with 1.56sec Timeout (MAX815)
  • Power-Supply Glitch Immunity
  • 8-Pin SO and DIP Packages


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

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

Part NumberReset Thresh.
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(min)(@ +25°C)(max)(See Notes)
2.5 to 3.3
3.3 to 5.5
Active High
Active Low
85ms to 300msNo Watchdog-
Adjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
SOIC (N)/8
$5.72 @1k
2.5 to 3.3
3.3 to 5.5
Active Low
Input (WDI)
Input/Output (WDI/WDO)
1s to 2s
SOIC (N)/8
$6.82 @1k
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active High
Active Low
No Watchdog-
SOIC (N)/8
$6.11 @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.
Request Reliability Report for: MAX814 
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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