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3.0V/3.3V Microprocessor Supervisory Circuits

Industry's-First Battery-Backup Supervisor for 3.3V/3.0V Systems

Product Details

These microprocessor (µP) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in µP systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components.

These devices are designed for use in systems powered by 3.0V or 3.3V supplies. See the selector guide in the back of this data sheet for similar devices designed for 5V systems. The suffixes denote different reset threshold voltages: 3.075V (T), 2.925V (S), and 2.625V (R) (see Reset Threshold section in the Detailed Description). All these parts are available in 8-pin DIP and SO packages. Functions offered in this series are as follows:

Part Active-Low Reset Active-High Reset Watchdog Input Manual Reset Input Backup-Battery Switch Power-Fail Threshold Accuracy Power-Fail Comparator Reset Window
MAX690     ±4% ±75mV
MAX704     ±4% ±75mV
MAX802     ±2% ±2%
MAX804     ±2% ±2%
MAX805     ±4% ±75mV
MAX806     ±2% ±2%

Key Features

  • Active-Low RESET and RESET Outputs
  • Manual Reset Input
  • Precision Supply-Voltage Monitor
  • 200ms Reset Time Delay
  • Watchdog Timer (1.6sec timeout)
  • Battery-Backup Power Switching-Battery Can Exceed VCC in Normal Operation
  • 40µA VCC Supply Current
  • 1µA Battery Supply Current
  • Voltage Monitor for Power-Fail or Low-Battery Warning
  • Guaranteed Active-Low RESET Assertion to VCC = 1V
  • 8-Pin DIP and SO Packages

Applications/Uses

  • Battery-Powered Computers/Controllers
  • Critical µP Monitoring
  • Embedded Controllers
  • Intelligent Instruments
  • Portable Equipment
Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 2.5 to 3.3
Reset Out Active High
Active Low
Open Drain
ICC (µA) (max) 50
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/8
Budgetary
Price (See Notes)
$7.57 @1k
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Simplified Block Diagram

MAX690T: Typical Operating Circuit  MAX690T: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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Parameters

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 2.5 to 3.3
Reset Out Active High
Active Low
Open Drain
ICC (µA) (max) 50
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/8
Budgetary
Price (See Notes)
$7.57 @1k

Key Features

  • Active-Low RESET and RESET Outputs
  • Manual Reset Input
  • Precision Supply-Voltage Monitor
  • 200ms Reset Time Delay
  • Watchdog Timer (1.6sec timeout)
  • Battery-Backup Power Switching-Battery Can Exceed VCC in Normal Operation
  • 40µA VCC Supply Current
  • 1µA Battery Supply Current
  • Voltage Monitor for Power-Fail or Low-Battery Warning
  • Guaranteed Active-Low RESET Assertion to VCC = 1V
  • 8-Pin DIP and SO Packages

Applications/Uses

  • Battery-Powered Computers/Controllers
  • Critical µP Monitoring
  • Embedded Controllers
  • Intelligent Instruments
  • Portable Equipment

Description

These microprocessor (µP) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in µP systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components.

These devices are designed for use in systems powered by 3.0V or 3.3V supplies. See the selector guide in the back of this data sheet for similar devices designed for 5V systems. The suffixes denote different reset threshold voltages: 3.075V (T), 2.925V (S), and 2.625V (R) (see Reset Threshold section in the Detailed Description). All these parts are available in 8-pin DIP and SO packages. Functions offered in this series are as follows:

Part Active-Low Reset Active-High Reset Watchdog Input Manual Reset Input Backup-Battery Switch Power-Fail Threshold Accuracy Power-Fail Comparator Reset Window
MAX690     ±4% ±75mV
MAX704     ±4% ±75mV
MAX802     ±2% ±2%
MAX804     ±2% ±2%
MAX805     ±4% ±75mV
MAX806     ±2% ±2%

Simplified Block Diagram

MAX690T: Typical Operating Circuit  MAX690T: 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