3-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits

Industry's-First Stand-Alone Reset ICs for 1.8V supplies in SOT package

Please check latest availability status for a specific part variant.


The MAX6332/MAX6333/MAX6334 microprocessor (µP) supervisory circuits monitor the power supplies in 1.8V to 3.3V µP and digital systems. They increase circuit reliability and reduce cost by eliminating external components and adjustments.

These devices perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for a preset timeout period after VCC has risen above the reset threshold. The only difference among the three devices is their output. The MAX6333 (push/pull) and MAX6334 (open-drain) have an active-low RESET output, while the MAX6332 (push/pull) has an active-high RESET output. The MAX6332/MAX6333 are guaranteed to be in the correct state for VCC down to 0.7V. The MAX6334 is guaranteed to be in the correct state for VCC down to 1.0V.

The reset comparator in these ICs is designed to ignore fast transients on VCC. Reset thresholds are factory-trimmable between 1.6V and 2.5V, in approximately 100mV increments. There are 15 standard versions available (2,500 piece minimum-order quantity); contact the factory for availability of nonstandard versions (10,000 piece minimum-order quantity). For space-critical applications, the MAX6332/MAX6333/MAX6334 come packaged in a 3-pin SOT23.

MAX6332, MAX6333, MAX6334: Typical Operating Circuit MAX6332, MAX6333, MAX6334: Typical Operating Circuit Enlarge+

Key Features

  • Ultra-Low 0.7V Operating Supply Voltage
  • Low 3.3µA Supply Current
  • Precision Monitoring of 1.8V and 2.5V Power-Supply Voltages
  • Reset Thresholds Available from 1.6V to 2.5V, in Approximately 100mV Increments
  • Fully Specified over Temperature
  • Three Power-On Reset Pulse Widths Available (1ms min, 20ms min, 100ms min)
  • Low Cost
  • Three Available Output Structures: Push/Pull Active-Low RESET, Push/Pull RESET, Open-Drain Active-Low RESET
  • Guaranteed RESET/Active-Low RESET Valid to VCC = 0.7V (MAX6332/MAX6333)
  • Power-Supply Transient Immunity
  • No External Components
  • 3-Pin SOT23 Package
  • Pin-Compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328


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

See parametric specs for Supervisors (1 Monitored Voltage) (252)

Part NumberReset Thresh.
Reset OuttRESETWatchdog FeatureReset Thresh. Accur.
min@ +25°CmaxSee Notes
1.2 to 1.8
1.8 to 2.5
Active High
1ms to 15ms
15ms to 85ms
85ms to 300ms
No Watchdog1.87
$1.42 @1k
Active Low
$1.41 @1k
Active Low
Open Drain
$1.41 @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: MAX6333.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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