µP Reset Circuits with Long Manual Reset Setup Period

µP Reset Circuits with Long Manual-Reset Setup Period Eliminate Unwanted Reset Conditions in Front-Panel Applications

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The MAX6443–MAX6452 low-current microprocessor reset circuits feature single or dual manual reset inputs with an extended setup period. Because of the extended setup period, short switch closures (nuisance resets) are ignored.

On all devices, the reset output asserts when any of the monitored supply voltages drops below its specified threshold. The reset output remains asserted for the reset timeout period (210ms typ) after all monitored supplies exceed their reset thresholds. The reset output is one-shot pulse asserted for the reset timeout period (140ms min) when selected manual reset input(s) are held low for an extended setup timeout period. These devices ignore manual reset transitions of less than the extended setup timeout period.

The MAX6443–MAX6448 are single fixed-voltage µP supervisors. The MAX6443/MAX6444 have a single extended manual reset input. The MAX6445/MAX6446 have two extended manual reset inputs. The MAX6447/MAX6448 have one extended and one immediate manual reset input.

The MAX6449–MAX6452 have one fixed-threshold µP supervisor and one adjustable-threshold µP supervisor. The MAX6449/MAX6450 have two delayed manual reset inputs. The MAX6451/MAX6452 have one delayed and one immediate manual reset input.

The MAX6443–MAX6452 have an active-low RESET with push-pull or open-drain output logic options. These devices, offered in small SOT packages, are fully guaranteed over the extended temperature range (-40°C to +85°C).
MAX6443, MAX6444: Functional Diagram MAX6443, MAX6444: Functional Diagram Enlarge+

Key Features

  • Single- or Dual-Supply Voltage Monitors
  • Precision Factory-Set Reset Thresholds from 1.6V to 4.6V
  • Adjustable Threshold to Monitor Voltages Down to 0.63V (MAX6449–MAX6452)
  • Single or Dual Manual Reset Inputs with Extended Setup Period
  • Optional Short Setup Time Manual Reset Input (MAX6447/MAX6448 and MAX6451/MAX6452)
  • Immune to Short Voltage Transients
  • Low 6µA Supply Current
  • Guaranteed Valid Reset Down to VCC = 1.0V
  • Active-Low RESET (Push-Pull or Open-Drain) Outputs
  • 140ms (min) Reset Timeout Period
  • Small SOT143 and SOT23 Packages
  • AEC-Q100 Qualified (MAX6444US16K/V+T)


  • Automotive
  • Cable/DSL Modems
  • Consumer Electronics
  • DVD Players
  • Industrial Equipment
  • Medical Devices
  • MP3 Players
  • Set-Top Boxes

See parametric specs for Resets and Supervisors with Pushbutton Manual Reset Inputs (13)

Part NumberMonitored VoltagesManual Reset FeatureMR1 Setup TimeMR2 Setup TimeReset Thresh.
Reset OuttRESETReset Thresh. Accur.
Oper. Temp.
min@ +25°CmaxSee Notes
MAX6443 1Extended Setup Period6.72s-
1.2 to 1.79
1.8 to 2.49
2.5 to 3.29
3.3 to 4.99
Active Low
85ms to 300ms2.516
-40 to +85
0 to +70
$1.49 @1k
MAX6444 1-
Active Low
Open Drain
$1.08 @1k
MAX6445 16.72s
Active Low
$2.34 @1k
MAX6446 16.72s
Active Low
Open Drain
$2.34 @1k
MAX6447 11µs
Active Low
$2.34 @1k
MAX6450 26.72s
Active Low
Open Drain
$2.34 @1k
MAX6452 21µs
Active Low
Open Drain
$2.34 @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: MAX6452 
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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