ADM691AR

Supervisors Overview

The ADM691AR is a microprocessor supervisory circuit manufactured by Analog Devices Inc., designed for power supply monitoring and battery control in embedded systems. It operates within a maximum supply voltage of 5.5 V and monitors a single input with a threshold voltage of 4.65 V. The device features an open-drain or push-pull output, a watchdog timer, and automatic battery backup switching. It supports chip enable signals and includes power-failure detection capabilities. Operating temperatures range from -40°C to +85°C, housed in a SOIC-16 surface-mount package.

Supervisors Feature Summary

• Integrates complete microprocessor reset, watchdog timer, and battery backup switchover functions on a single chip.
• Provides precision voltage monitoring with low standby current consumption suitable for battery-operated applications.
• Features automatic power-failure warning and onboard gating of chip enable signals for system protection.

Supervisors Applications

• Microprocessor systems requiring reliable power supervision
• Computers and controllers needing automated reset sequences
• Intelligent instruments with critical power monitoring requirements
• Automotive systems demanding robust voltage supervision

Supervisors Procurement Notes

Verify the specific suffix (e.g., AR vs. ARZ) against the manufacturer's current datasheet to confirm RoHS compliance status and exact pinout configuration. Ensure the selected variant matches the required operating temperature range and package type for your design. Cross-reference ordering information directly with Analog Devices official documentation to avoid discrepancies in revision levels or packaging specifications.

Supervisors Selection Notes

Select this component when a single-chip solution for voltage supervision, watchdog timing, and battery management is required. It serves as an upgrade path for legacy MAX691A family designs. Consider the SOIC-16 package constraints and the specific reset delay characteristics. Verify that the monitored voltage threshold aligns with the target system's logic levels and power rail specifications before integration.

Supervisors Part Context

The ADM691AR belongs to the ADM691A/ADM693A/ADM800L/ADM800M family of supervisory circuits from Analog Devices. This family provides comprehensive power management functions including µP reset, backup-battery switchover, and CMOS RAM write protection. The ADM691AR specifically offers a fixed threshold voltage option, distinguishing it from adjustable variants within the same product line.

Supervisors Replacement Considerations

Public confirmed substitute part numbers: ADM691AARN, ADM691AMJE, MAX691AMJE, MAX691EWE+T.