ADM690AARMZ

Supervisors Overview

The ADM690AARMZ is a microprocessor supervisory circuit manufactured by Analog Devices Inc., housed in an 8-MSOP surface-mount package. It features a fixed voltage threshold of 4.65V for power supply monitoring and provides an active-low reset output with a minimum timeout of 140ms. The device supports a maximum operating supply voltage of 5.5V and operates within a temperature range of -40°C to +85°C. Key functional attributes include backup battery switchover capabilities, watchdog timer functionality, and power-fail warning detection.

Supervisors Feature Summary

• Integrates precision voltage monitoring with automatic backup battery switchover to maintain system integrity during primary power loss.
• Includes a configurable watchdog timer to detect software malfunctions and ensure processor recovery without external components.
• Provides power-fail warning signals to alert the system of impending voltage drops before the reset threshold is reached.

Supervisors Applications

• Microprocessor reset circuits requiring precise voltage supervision
• Battery-backed memory systems utilizing automatic switchover logic
• Industrial control systems needing watchdog timer protection

Supervisors Procurement Notes

Verify the specific suffix 'ARMZ' against the manufacturer's current datasheet to confirm pinout compatibility and RoHS status. Ensure the required reset timeout and threshold voltage align with the design specifications. Confirm availability through authorized distributors as standard stock may be limited. Cross-reference the package dimensions with the PCB footprint to prevent assembly errors.

Supervisors Selection Notes

Select this component when a fixed 4.65V threshold is appropriate for the target rail. The 8-MSOP package suits space-constrained designs. Consider the ADM692A variant if a lower 4.40V threshold is required. Verify that the push-pull or open-collector output configuration matches the downstream logic requirements. Check thermal dissipation limits for high-density layouts.

Supervisors Part Context

This part belongs to the ADM690/ADM692 family of supervisory circuits designed for CMOS and microprocessor applications. It complements other ADI PMIC solutions by providing essential reset and monitoring functions. The series is widely used in embedded systems where reliable power management and fault detection are critical for operational stability.

Supervisors Replacement Considerations

The MAX817LCUA+ is listed as a similar substitute. Verify electrical parameter alignment, specifically the reset threshold and timeout characteristics, before substitution. Ensure package compatibility and pinout correspondence to avoid redesigning the host circuit board.

Supervisors FAQ

Does the ADM690AARMZ include a manual reset input?

No, the device does not feature a manual reset input; it relies on automatic power-on reset and watchdog triggering.

What is the function of the V_BATT pin?

The V_BATT pin facilitates automatic switchover between the main supply (V_CC) and a backup battery source to preserve data.