ADM691AARN

Supervisors Overview

The ADM691AARN is a microprocessor supervisory circuit from Analog Devices, designed for complete single-chip power supply monitoring and battery control in microprocessor systems. It integrates precision voltage monitoring with ±2% tolerance, a watchdog timer, CMOS RAM write protection, and power-failure warning capabilities. The device operates within a maximum supply voltage of 5.5 V and features a fixed reset delay time of 200 ms. It supports automatic battery backup power switching and includes a chip enable signal for fast onboard gating. The component is manufactured using a 5V CMOS process and offers low standby current consumption.

Supervisors Feature Summary

• Integrates microprocessor reset, watchdog timer, and battery backup switching functions on a single chip
• Provides precision voltage monitoring with specified tolerance for reliable system supervision
• Includes CMOS RAM write protection and power-failure warning signals
• Supports automatic battery backup power switching to maintain system continuity

Supervisors Applications

• Microprocessor systems requiring comprehensive power supervision
• Computers and controllers needing reliable reset and watchdog mechanisms
• Intelligent instruments with critical power monitoring requirements
• Automotive systems utilizing microprocessor-based control units

Supervisors Procurement Notes

Verify the specific suffix 'ARN' against the manufacturer's official documentation to confirm package type and temperature range specifications. Ensure compatibility with existing board layouts and voltage levels before integration. Confirm availability status as distribution channels may indicate limited stock or discontinuation phases. Cross-reference the datasheet revision date to ensure all electrical parameters match the intended design requirements.

Supervisors Selection Notes

Select this component when a unified solution for reset, watchdog, and battery management is required. The integrated nature reduces bill-of-materials complexity compared to discrete solutions. Consider the ±2% voltage monitor tolerance and 200 ms reset delay for timing-sensitive applications. Evaluate the 5V CMOS process compatibility with the target system's logic levels and power constraints.

Supervisors Part Context

The ADM691AARN belongs to the ADM691A/ADM693A/ADM800L/ADM800M family of supervisory circuits. This family serves as an upgrade path for the MAX691A/93A/800M series, offering enhanced integration for microprocessor systems. The part provides essential power management functions including voltage monitoring, reset generation, and battery switchover in a compact form factor suitable for dense PCB designs.

Supervisors Replacement Considerations

The ADM691AARN is explicitly documented as an upgrade for the MAX691A/93A/800M family. Verify pinout and functional compatibility with these legacy parts before substitution. Check if alternative packages like TSSOP are available for the same functional core if space constraints differ.