ADM691AARNZ

Supervisors Overview

The ADM691AARNZ is a microprocessor supervisory circuit manufactured by Analog Devices Inc., designed for complete single-chip power supply monitoring and battery control in microprocessor systems. It operates within a maximum supply voltage of 5.5 V and features a threshold voltage of 4.65 V with an overvoltage threshold of 4.75 V. The device provides a reset delay time of 200 ms and includes a watchdog timer function. It utilizes an open-drain output type and supports chip enable signals. The component is housed in a SOIC-16 package, suitable for surface mount installation, and functions across a temperature range from -40 C to +85 C.

Supervisors Feature Summary

• Integrates precision voltage monitoring with ±2% tolerance for reliable system supervision.
• Provides automatic battery backup power switching to maintain data integrity during power transitions.
• Includes a configurable watchdog timer and CMOS RAM write protection capabilities.

Supervisors Applications

• Microprocessor systems requiring robust power supervision
• Computers and controllers needing automated reset sequences
• Automotive systems demanding critical power monitoring

Supervisors Procurement Notes

Verify current availability status as the part may be subject to limited supply or factory special orders. Confirm that the SOIC-16 package matches your PCB footprint requirements. Ensure the operating temperature range of -40 C to +85 C aligns with your environmental specifications. Check for RoHS compliance details if required by your manufacturing standards. Validate that the open-drain output configuration is compatible with your downstream logic levels.

Supervisors Selection Notes

Select this component when a dedicated supervisory circuit with integrated watchdog and battery backup switching is required. The fixed 200 ms reset delay suits applications where immediate reset upon brownout is not necessary. Consider the low standby current of 1 μA for battery-powered designs. The SOIC-16 package offers a balance between pin count and board space. Ensure the 5.5 V maximum supply rating covers your system's peak voltage conditions.

Supervisors Part Context

The ADM691AARNZ belongs to the ADM691A/ADM693A/ADM800L/ADM800M family of supervisory circuits. It serves as an upgrade path for the MAX691A/93A/800M family, offering enhanced integration for microprocessor reset, backup-battery switchover, and power-failure warning functions. This lineage ensures compatibility with established design practices while providing modern CMOS process benefits.

Supervisors Replacement Considerations

Public confirmed substitute part numbers include ADM691AARN and ADM691AARN-REEL7. These variants share identical functional descriptions and electrical characteristics but differ primarily in packaging format such as tube versus reel. Verify that any alternative from the same family maintains the SOIC-16 package and 4.65 V threshold requirements.