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Microprocessor Supervisory Circuits

Industry-Standard, Full-Function µP Supervisor

Product Details

Key Features

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 4.0 to 4.5
Reset Out Active Low
Push-Pull
ICC (µA) (max) 5000
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins CDIP/8
PDIP/8
Budgetary
Price (See Notes)
4.87
View Less

Simplified Block Diagram

Technical Docs

Data Sheet Microprocessor Supervisory Circuits May 06, 2015

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Sampling:
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Parameters

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 4.0 to 4.5
Reset Out Active Low
Push-Pull
ICC (µA) (max) 5000
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins CDIP/8
PDIP/8
Budgetary
Price (See Notes)
4.87

Key Features

  • Supervisory Function Integration Saves Board Space while Fully Protecting Microprocessor-Based Systems
    • Precision Voltage Monitor
      • 4.65V (MAX690, MAX691, MAX694, MAX695)
      • 4.40V (MAX692, MAX693)
    • Power OK/Reset Time Delay
      • 50ms, 200ms, or Adjustable
    • Watchdog Timer
      • 100ms, 1.6s, or Adjustable
    • Battery Backup Power Switching
    • Voltage Monitor for Power Fail or Low Battery Warning
    • Minimum External Component Count
  • Low Power Consumption in Battery Backup Mode Extends Battery Life
    • 1µA Standby Current
  • Onboard Gating of Chip Enable Signals Protects Against Erroneous Data Written to RAM During Low VCC Events

Applications/Uses

  • Automotive Systems
  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments

Description

The MAX690 family of supervisory circuits reduces the complexity and number of components required for power supply monitoring and battery control functions in microprocessor systems. These include µP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The MAX690 family significantly improves system reliability and accu- racy compared to that obtainable with separate ICs or discrete components.

The MAX690, MAX692, and MAX694 are supplied in 8-pin packages and provide four functions:

  • A reset output during power-up, power-down, and brownout conditions.
  • Battery backup switching for CMOS RAM, CMOS microprocessor or other low power logic.
  • A Reset pulse if the optional watchdog timer has not been toggled within a specified time.
  • A 1.3V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than +5V.

The MAX691, MAX693, and MAX695 are supplied in 16-pin packages and perform all MAX690, MAX692, MAX694 functions, plus:

  • Write protection of CMOS RAM or EEPROM.
  • Adjustable reset and watchdog timeout periods.
  • Separate outputs for indicating a watchdog timeout, backup-battery switchover, and low VCC.

Simplified Block Diagram

MAX690, MAX691, MAX692, MAX693, MAX694, MAX695: Pin Configuration MAX690, MAX691, MAX692, MAX693, MAX694, MAX695: Pin Configuration Zoom icon

Technical Docs

Data Sheet Microprocessor Supervisory Circuits May 06, 2015

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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.