ADM690AQ

Supervisors Overview

The ADM690AQ is a microprocessor supervisory circuit from the ADM690 family, designed for power supply monitoring and battery control. It features a precision voltage monitor with a threshold of 4.65 V and an overvoltage threshold of 4.75 V. The device operates within a supply voltage range up to 5.5 V and includes a watchdog timer, battery backup switching, and power failure warning capabilities. It provides reset assertion down to 1 V with a typical delay of 200 ms. The component supports low power consumption with a standby current of 600 nA and offers high current drive capability. It is specified for operation in industrial temperature ranges.

Supervisors Feature Summary

• Integrates complete power supply monitoring and battery control functions including microprocessor reset, backup battery switchover, and CMOS RAM write protection.
• Features a precise internal voltage reference and comparator circuit that monitors the power supply line for out-of-tolerance conditions.
• Provides automatic battery backup power switching with low switch-on resistance during normal operation and high resistance in backup mode.
• Includes a configurable watchdog timer and extremely fast gating of chip enable signals to protect system integrity.

Supervisors Applications

• Microprocessor systems requiring reliable power supervision
• Computers and controllers needing automated reset and watchdog functions
• Intelligent instruments with battery backup requirements
• Automotive systems demanding robust voltage monitoring

Supervisors Procurement Notes

Verify the specific suffix 'AQ' against official Analog Devices documentation to confirm military-grade qualification and temperature range specifications. Confirm availability status as legacy or discontinued parts may have limited sourcing options. Ensure compatibility with existing PCB footprints and thermal management requirements before procurement.

Supervisors Selection Notes

Select this component when a single-chip solution for voltage monitoring, watchdog timing, and battery backup is required. Consider the 4.65 V threshold and 200 ms reset delay for system timing constraints. Evaluate the 600 nA standby current for low-power applications. Verify package compatibility and operating temperature range suitability for the target environment.

Supervisors Part Context

The ADM690AQ belongs to the ADM690–ADM695 family of supervisory circuits by Analog Devices. This family provides comprehensive solutions for microprocessor system protection, integrating functions such as reset generation, watchdog timers, and battery management into a single integrated circuit. The AQ suffix typically denotes a specific grade or packaging variant within the broader ADM690 product line.

Supervisors Replacement Considerations

The MAX690 series serves as a direct predecessor and functional equivalent within the same ecosystem. Verify pinout compatibility and electrical parameter alignment, particularly regarding reset thresholds and watchdog intervals, when substituting between ADM and MAX prefixes.