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Maxim > Products > Supervisors, Voltage Monitors, Sequencers > MAX803L, MAX803M, MAX803R, ...

MAX803L, MAX803M, MAX803R, MAX803S, MAX803T, MAX803Z, MAX809J, MAX809L, MAX809M, MAX809R, MAX809S, MAX809T, MAX809Z, MAX810L, MAX810M, MAX810R, MAX810S, MAX810T, MAX810Z

3-Pin Microprocessor Reset Circuits

Industry's-First 3-Pin SC70 Reset ICs
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The MAX803/MAX809/MAX810 are microprocessor (µP) supervisory circuits used to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V, +3.0V, or +2.5V powered circuits.

These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available.

The MAX803 has an open-drain output stage, while the MAX809/MAX810 have push-pull outputs. The MAX803's open-drain active-low RESET output requires a pullup resistor that can be connected to a voltage higher than VCC. The MAX803/MAX809 have an active-low RESET output, while the MAX810 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 1V.

Low supply current makes the MAX803/MAX809/MAX810 ideal for use in portable equipment. The MAX803 is available in a 3-pin SC70 package, and the MAX809/MAX810 are available in 3-pin SC70 or SOT23 packages.

Data Sheet

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Key Features

  • Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages
  • Fully Specified Over Temperature
  • Available in Three Output Configurations
    • Open-Drain Active-Low RESET Output (MAX803)
    • Push-Pull Active-Low RESET Output (MAX809)
    • Push-Pull RESET Output (MAX810)
  • 140ms min Power-On Reset Pulse Width
  • 12µA Supply Current
  • Guaranteed Reset Valid to VCC= +1V
  • Power Supply Transient Immunity
  • No External Components
  • 3-Pin SC70 and SOT23 Packages


  • Automotive Electronics
  • Computers: Desktop, Workstation, Server
  • Controllers
  • Critical µP and µC Power Monitoring
  • Intelligent Instruments
  • Portable Battery-Powered Equipment

Key Specifications:

Supervisors (1 Monitored Voltage)
Part Number Reset Thresh.
Reset Out tRESET Watchdog Feature Reset Thresh. Accur.
min @ +25°C max See Notes
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
85ms to 300ms No Watchdog 1.5 60 $1.18 @1k
Active Low
$1.60 @1k
Active High
$1.56 @1k
See All Supervisors (1 Monitored Voltage) (275)

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.


MAX803L, MAX803M, MAX803R, MAX803S, MAX803T, MAX803Z, MAX809, MAX809J, MAX809L, MAX809M, MAX809R, MAX809S, MAX809T, MAX809Z, MAX810, MAX810L, MAX810M, MAX810R, MAX810S, MAX810T, MAX810Z: Typical Operating Circuit
Typical Operating Circuit

More Information

Topmark Coding MAX803
Topmark Coding MAX809
Topmark Coding MAX810
New Product Press Release   2000-01-20 ]

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Document Ref.: 19-0344 Rev 8; 2012-12-19
This page last modified: 2012-12-19