ADM691AARNZ-REEL

Supervisors Overview

The ADM691AARNZ-REEL7 is a microprocessor supervisory circuit from Analog Devices, designed for complete single-chip power supply monitoring and battery control in microprocessor systems. It features a precision voltage monitor with ±2% tolerance on the reset threshold. The device provides a fixed 200 ms reset delay time and operates within a supply voltage range up to 5.5 V. Key electrical parameters include a 4.65 V threshold voltage, a 4.75 V overvoltage threshold, and a standby current of 1 μA. It utilizes an open-drain output type and includes a watchdog timer function. The component is housed in a SOIC-16 package and supports operation temperatures from -40°C to +85°C.

Supervisors Feature Summary

• Integrates microprocessor reset, backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning functions into a single chip solution.
• Provides low power consumption with a precision voltage monitor offering ±2% tolerance on the reset threshold and 1 μA standby current.
• Features automatic battery backup power switching and fast onboard gating of chip enable signals for efficient system management.

Supervisors Applications

• Microprocessor Systems
• Computers and Controllers
• Intelligent Instruments
• Automotive Systems
• Critical Microprocessor Power Monitoring

Supervisors Procurement Notes

Verify the specific suffix (REEL vs REEL7) against the manufacturer's latest datasheet to ensure packaging compatibility. Confirm that the SOIC-16 package dimensions match the target PCB footprint. Check for end-of-life status or obsolescence notices, as older supervisory circuits may have limited availability or require alternative sourcing strategies for long-term production.

Supervisors Selection Notes

Select this component when a dedicated supervisory circuit with integrated battery backup switching and watchdog functionality is required. Ensure the application voltage does not exceed the 5.5 V maximum rating. Consider the 200 ms reset delay if faster response times are needed, as other variants may offer adjustable delays. Verify that the open-drain output configuration aligns with the microprocessor input requirements.

Supervisors Part Context

The ADM691A belongs to the ADM691A/ADM693A/ADM800L/ADM800M family of supervisory circuits, which serves as an upgrade for the MAX691A/93A/800M family. These devices are part of Analog Devices' portfolio of power management ICs focused on system reliability. The REEL suffix indicates tape-and-reel packaging suitable for automated surface-mount assembly processes.

Supervisors Replacement Considerations

Public confirmed substitute part numbers: ADM691AARN, ADM691AARNZ, ADM691ARZ, ADM691ARZ-REEL7. Cross-reference pinouts and electrical specifications before substitution.