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4-Pin µP Voltage Monitors with Manual Reset Input

4-Pin SOT Reset ICs with Manual Reset

Product Details

The MAX811/MAX812 are low-power microprocessor (µP) supervisory circuits used to monitor 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-powered or 3V-powered circuits. The MAX811/MAX812 also provide a debounced manual reset input.

These devices perform a single function: They assert a reset signal whenever the VCC supply voltage falls below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. The only difference between the two devices is that the MAX811 has an active-low RESET output (which is guaranteed to be in the correct state for VCC down to 1V), while the MAX812 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds are available for operation with a variety of supply voltages.

Low supply current makes the MAX811/MAX812 ideal for use in portable equipment. The devices come in a 4-pin SOT143 package.

Key Features

  • Integrated Voltage Monitor Increases System Robustness with Added Manual Reset
    • Precision Monitoring of 3V, 3.3V, and 5V Power-Supply Voltages
    • 140ms Min Power-On-Reset Pulse Width
      • - Active-Low RESET Output (MAX811), RESET Output (MAX812)
    • Guaranteed Over Temperature
    • Guaranteed Active-Low RESET Valid to VCC = 1V (MAX811)
    • Power-Supply Transient Immunity
  • Saves Board Space
    • No External Components
    • 4-Pin SOT143 Package
  • Low Power Consumption Simplifies Power-Supply Requirements
    • 6µA Supply Current

Applications/Uses

  • Computers: Desktop, Workstation, Server
  • Controllers
  • Critical µP and µC Power Monitoring
  • Intelligent Instruments
  • Portable Battery-Powered Equipment
Parametric specs for Single-Voltage Monitors
Reset Thresh. (V) 2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 1.5
Reset Out Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature No Watchdog
Supervisor Features Manual Reset
ICC (µA) (max) 15
Package/Pins SOT23/4
Budgetary
Price (See Notes)
$1.60 @1k
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Simplified Block Diagram

MAX811, MAX811L, MAX811M, MAX811R, MAX811S, MAX811T, MAX812, MAX812L, MAX812M, MAX812R, MAX812S, MAX812T: Typical Operating Circuit MAX811, MAX811L, MAX811M, MAX811R, MAX811S, MAX811T, MAX812, MAX812L, MAX812M, MAX812R, MAX812S, MAX812T: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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SIMULATION MODELS

MAX811 IBIS Model

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SIMULATION MODELS

MAX811S IBIS Model

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Support & Training

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Parameters

Parametric specs for Single-Voltage Monitors
Reset Thresh. (V) 2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 1.5
Reset Out Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature No Watchdog
Supervisor Features Manual Reset
ICC (µA) (max) 15
Package/Pins SOT23/4
Budgetary
Price (See Notes)
$1.60 @1k

Key Features

  • Integrated Voltage Monitor Increases System Robustness with Added Manual Reset
    • Precision Monitoring of 3V, 3.3V, and 5V Power-Supply Voltages
    • 140ms Min Power-On-Reset Pulse Width
      • - Active-Low RESET Output (MAX811), RESET Output (MAX812)
    • Guaranteed Over Temperature
    • Guaranteed Active-Low RESET Valid to VCC = 1V (MAX811)
    • Power-Supply Transient Immunity
  • Saves Board Space
    • No External Components
    • 4-Pin SOT143 Package
  • Low Power Consumption Simplifies Power-Supply Requirements
    • 6µA Supply Current

Applications/Uses

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

Description

The MAX811/MAX812 are low-power microprocessor (µP) supervisory circuits used to monitor 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-powered or 3V-powered circuits. The MAX811/MAX812 also provide a debounced manual reset input.

These devices perform a single function: They assert a reset signal whenever the VCC supply voltage falls below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. The only difference between the two devices is that the MAX811 has an active-low RESET output (which is guaranteed to be in the correct state for VCC down to 1V), while the MAX812 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds are available for operation with a variety of supply voltages.

Low supply current makes the MAX811/MAX812 ideal for use in portable equipment. The devices come in a 4-pin SOT143 package.

Simplified Block Diagram

MAX811, MAX811L, MAX811M, MAX811R, MAX811S, MAX811T, MAX812, MAX812L, MAX812M, MAX812R, MAX812S, MAX812T: Typical Operating Circuit MAX811, MAX811L, MAX811M, MAX811R, MAX811S, MAX811T, MAX812, MAX812L, MAX812M, MAX812R, MAX812S, MAX812T: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.