1. Products
  2. Power Monitor, Control, and Protection
  3. Supervisory Circuits
  4. Single-Supply Monitors
  5. ADM8691


Features and Benefits

  • Upgrade for the ADM690, ADM691, ADM695 and for the MAX690, MAX691, MAX695
  • Specified over temperature
  • Low power consumption: 0.7 mW
  • Precision voltage monitor
  • Reset assertion down to 1 V VCC
  • Low switch on resistance: 0.7 Ω normal, 7 Ω in backup
  • High current drive: 100 mA
  • Watchdog timer: 100 ms, 1.6 sec, or adjustable
  • Standby current: 400 nA
  • Automatic battery backup power switching
  • Extremely fast gating of chip enable signals (3 ns)
  • Voltage monitor for power fail
  • Available in TSSOP package

Product Details

The ADM8690 / ADM8691 / ADM8695 supervisory circuits offer complete single-chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include microprocessor reset, backup battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning. The complete family provides a variety of configurations to satisfy most microprocessor system requirements.

The ADM8690 / ADM8691 / ADM8695 are fabricated using an advanced epitaxial CMOS process that combines low power consumption (0.7 mW), extremely fast chip enable gating (3 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


The ADM8690 is available in 8-lead PDIP and SOIC packages and provides the following functions:

  1. Power-on reset output during power-up, power-down and brownout conditions. The RESET output remains operational with VCC as low as 1 V.
  2. Battery backup switching for CMOS RAM, CMOS microprocessor or other low power logic.
  3. A reset pulse if the optional watchdog timer has not been toggled within a specified time.
  4. A 1.3 V threshold detector for power fail warning, low battery detection or to monitor a power supply other than +5 V.

The ADM8691 and ADM8695 are available in 16-lead PDIP and small outline packages (including TSSOP) and provide three additional functions:

  1. Write protection of CMOS RAM or EEPROM.
  2. Adjustable reset and watchdog timeout periods.
  3. Separate watchdog timeout, backup battery switchover, and low VCC status outputs.


  • Microprocessor systems
  • Computers
  • Controllers
  • Intelligent instruments
  • Automotive systems

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
ADM8691ANZ Material Declaration Reliability Data 16-Lead PDIP
ADM8691ARNZ Material Declaration Reliability Data 16-Lead SOIC
ADM8691ARWZ Material Declaration Reliability Data 16 ld SOIC
Wafer Fabrication Data

PCN-PDN Information

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Sample & Buy

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Buy Now Pricing

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List Pricing

(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

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