ADM690ARM

Supervisors Overview

The ADM690ARM is a microprocessor supervisory circuit manufactured by Analog Devices Inc., designed for monitoring system power integrity. It operates within a supply voltage range of 4.75 V to 5.5 V, featuring a precise threshold voltage of 4.65 V for reset assertion. The device integrates a watchdog timer with a timeout period of 200 ms and includes a backup battery switchover function to maintain data retention during primary power loss. It provides an active low push-pull reset output and detects power failures. The component is housed in an 8-MSOP package and supports operation across an industrial temperature range of -40°C to +85°C.

Supervisors Feature Summary

• Integrates a watchdog timer with a fixed 200 ms timeout period for processor fault detection.
• Includes a backup battery switchover mechanism to ensure continuous power supply during main voltage failure.
• Provides power-fail warning capability to alert the system of impending voltage drops below the operating threshold.

Supervisors Applications

• Microprocessor system power supervision
• Battery-backed memory protection circuits
• Industrial control system voltage monitoring

Supervisors Procurement Notes

Verify the specific suffix 'ARM' against the official Analog Devices datasheet to confirm the package type and temperature grade. Ensure compatibility with existing PCB footprints for the 8-MSOP configuration. Confirm that the 4.65 V threshold aligns with the target 5 V logic levels. Check for RoHS compliance status as indicated in the manufacturer's documentation before finalizing procurement.

Supervisors Selection Notes

Select this component when a fixed 4.65 V threshold is required for 5 V systems. The integrated watchdog and battery switchover features reduce external component count compared to discrete solutions. Consider the 8-MSOP package size constraints and the 200 ms reset delay time relative to the microprocessor startup requirements. Verify that the push-pull output drive capability meets the load requirements of the connected logic inputs.

Supervisors Part Context

The ADM690 series belongs to Analog Devices' family of microprocessor supervisory circuits. These devices are engineered to provide reliable reset signals and system management functions in embedded applications. The ADM690 specifically targets standard 5 V logic environments, offering precision monitoring and fault protection without requiring external timing components or complex configuration.

Supervisors Replacement Considerations

Direct replacements include other variants within the ADM690 series such as the ADM690ANZ or ADM690ARZ, provided the package and temperature specifications match the design requirements. Cross-referencing with the MAX690 series may be necessary if pin-compatible alternatives from Maxim Integrated are preferred, though electrical characteristics should be verified.