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ADM697:  Microprocessor Supervisor with Chip Enable Signals, Adjustable Low Line Voltage Monitor, Adjustable Watchdog Timer, Low Line, Power Fail and Watchdog Status Outputs and 100mA Output Current

Product Details

The ADM696/ADM697 supervisory circuits offer complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup-battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning.

The ADM696/ADM697 are available in 16-pin DIP and small outline packages and provide the following functions:

  • Power-On Reset output during power-up, power-down and brownout conditions. The RESET voltage threshold is adjustable using an external voltage divider. The RESET output remains operational with VCC as low as 1 V.
  • A Reset pulse if the optional watchdog timer has not been toggled within specified time.
  • Separate watchdog time-out and low line status outputs.
  • Adjustable reset and watchdog timeout periods.
  • A 1.3 V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than VCC.
  • Battery backup switching for CMOS RAM, CMOS micro-processor or other low power logic
  • (ADM696).
  • Write protection of CMOS RAM or EEPROM (ADM697).

The ADM696/ADM697 is fabricated using an advanced epitaxial CMOS process combining low power consumption (5 mW), extremely fast Chip Enable gating (5 ns) and high reliability. RESET assertion is guaranteed with VCC as low as 1 V. In addition, the power switching circuitry is designed for minimal voltage drop thereby permitting increased output current drive of up to 100 mA without the need for an external pass transistor.


  • Superior Upgrade for MAX696/MAX697
  • Specified Over Temperature
  • Adjustable Low Line Voltage Monitor
  • Power OK/Reset Time Delay
  • Reset Assertion Down to 1 V VCC
  • Watchdog Timer—100 ms, 1.6 s, or Adjustable
  • Low Switch On Resistance
  • 1.5 O Normal, 20 O in Backup
  • 600 nA Standby Current
  • Automatic Battery Backup Switching (ADM696)
  • Fast On-Board Gating of Chip Enable Signals (ADM697)
  • Voltage Monitor for Power Fail or Low Battery Warning

Functional Block Diagram for ADM697


Title Content Type File Type
ADM696/ADM697: Microprocessor Supervisory Circuits Data Sheet  (Rev 0, 10/2002) (pdf, 409 kB) Data Sheets PDF
Supervisory Devices Complementary Parts Guide for Altera FPGAs  (pdf, 664 kB) Product Selection Guide PDF
Supervisory Devices Complementary Parts Guide for Xilinx FPGAs  (pdf, 661 kB) Product Selection Guide PDF
Voltage Monitoring Products Applications Guide  (pdf, 1808 kB) Solutions Bulletins PDF
Voltage Monitoring and Sequencing (2009/2010)  (pdf) Overview PDF
Voltage Monitoring Products 2008  (pdf, 3930 kB) Overview PDF
Power System Management (Spring 2007)  (pdf, 1170 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

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Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

ADM697 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
ADM697AN Status: Last Time Buy 16 ld PDIP 16 Ind Tube, 25 $3.51 $3.03 N  Material Info PCN/PDN Purchase
ADM697ANZ Status: Production 16 ld PDIP 16 Ind Tube, 25 $3.04 $2.63 Y  Material Info PCN Purchase Sample
ADM697AR Status: Production 16 ld SOIC - Wide 16 Ind Tube, 47 $3.92 $3.34 N  Material Info PCN Purchase
ADM697ARZ Status: Production 16 ld SOIC - Wide 16 Ind Tube, 47 $3.39 $2.88 Y  Material Info PCN Purchase Sample
ADM697ARZ-REEL Status: Production 16 ld SOIC - Wide 16 Ind Reel, 1000 - $2.88 Y  Material Info PCN Purchase
ADM697SQ Status: Obsolete CERDIP GLASS SEAL 16 Mil Tube, 25 - - N  Material Info Notify Me Contact ADI
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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