ADM691ARZ

Supervisors Overview

The ADM691ARZ is a microprocessor supervisory circuit manufactured by Analog Devices Inc., designed for single-chip power supply monitoring and battery control in embedded 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 4.73 V. The device provides a fixed reset delay time of 200 ms and includes a watchdog timer function. It draws a typical operating supply current of 1.95 mA and supports open-drain output types. The component is housed in a SOIC-16 surface-mount package and functions across a temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Integrates complete microprocessor reset, backup-battery switchover, watchdog timer, and power-failure warning capabilities on a single chip.
• Provides precision voltage monitoring with automatic battery backup power switching and onboard gating of chip enable signals.
• Features low standby current consumption and CMOS RAM write protection functionality.

Supervisors Applications

• Microprocessor systems
• Computers and controllers
• Intelligent instruments
• Automotive systems

Supervisors Procurement Notes

Verify the specific suffix REEL7 or tube packaging requirements against current stock availability, as distribution channels may vary. Confirm RoHS compliance status through official manufacturer documentation before integration. Ensure the SOIC-16 footprint matches the target PCB design constraints. Cross-reference the exact part number with the latest datasheet revision to confirm pinout and electrical characteristics remain unchanged.

Supervisors Selection Notes

Select this component when a dedicated supervisory circuit with integrated watchdog and battery backup switching is required for 5V logic systems. The ADM691ARZ is suitable for designs needing precise voltage monitoring without external components. Consider the 1.95 mA operating current if power efficiency is not the primary constraint compared to lower-power alternatives like the ADM691AARNZ variant.

Supervisors Part Context

The ADM691ARZ belongs to the ADM691A/ADM693A/ADM800L/ADM800M family of supervisory circuits from Analog Devices. This family serves as an upgrade path for the legacy MAX691A/93A/800M series, offering enhanced integration for microprocessor system protection. The ARZ designation indicates the standard commercial grade temperature range and SOIC-16 package configuration.

Supervisors Replacement Considerations

The ADM691AARNZ is a verified substitute within the same family, offering similar supervisory functions but potentially differing in packaging (tube vs. reel) and standby current specifications. Verify pin compatibility and electrical parameter alignment before substitution.