Ultra-Small, Hex Voltage, Microprocessor Supervisor

Increases Reliability While Reducing Solution Size

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The MAX16055 precision hex voltage microprocessor (µP) supervisory circuit monitors up to six system-supply voltages and asserts a single reset when any one supply voltage drops below its preset threshold. The device significantly reduces system size and component count while improving reliability compared to multiple ICs or discrete components.

A variety of factory-trimmed threshold voltages are available to accommodate different supply voltages and tolerance with minimal external components. The MAX16055 includes internally fixed threshold options for monitoring 3.3V, 3.0V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1.0V, and 0.9V supplies with -5% or -10% tolerance. The MAX16055 is also available with one to five adjustable threshold inputs to monitor voltages down to 0.5V.

A single active-low, open-drain output asserts when any monitored input falls below its associated threshold. The reset output features a weak internal pullup (typically 70µA) to supply input IN1. The reset output remains low for the reset timeout period (140ms, min) after all voltages rise above the selected thresholds. The reset output remains valid as long as either IN1 or IN2 input voltage is above 1V. The MAX16055 is available in a small 10-pin µMAX® (3mm x 3mm) package. The MAX16055 operates over the -40°C to +125°C automotive temperature range.
MAX16055: Typical Application Circuit MAX16055: Application Operating Circuit Enlarge+

Key Features

  • Precision Factory-Set Reset Threshold Options 3.3V, 3.0V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1.0V, and 0.9V
  • Adjustable Voltage Threshold Monitors Down to 0.5V with 1.5% Accuracy
  • Open-Drain Active-Low RESET Output with 70µA Internal Pullup
  • Fixed 140ms (min) Reset Timeout Period
  • Manual Reset Input
  • Reset Valid for IN1 ≥ 1V or IN2 = 1V
  • Tolerance Select (5%/10%) Input
  • Immune to Short Supply Transients


  • Computers
  • Data Storage Equipment
  • Desktop and Notebook Computers
  • High-End Printers
  • Industrial Equipment
  • Networking Equipment
  • Servers/Workstations
  • Set-Top Boxes
  • Telecommunications

See parametric specs for Supervisors (4 Monitored Voltages) (22)

Part NumberInterfaceReset Thresh.
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
min@ +25°CmaxSee Notes
Factory Fixed
R/C Adjustable
0 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
Active Low
Open Drain
With Internal Pull-Up
85ms to 300msNo WatchdogManual Reset1.555
$1.92 @1k

See parametric specs for Supervisors (> 5 Monitored Voltages) (13)

Part NumberMonitored VoltagesPackage/Pins
See Data Sheet

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.

Technical Documents

App Note 5040 Voltage Monitoring in Complex Systems
Product Reliability Reports: MAX16055.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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