ADM691AAN

Supervisors Overview

The ADM691AAN is a microprocessor supervisory circuit manufactured by Analog Devices Inc., housed in a 16-pin DIP package. It provides comprehensive power management functions including voltage monitoring, reset generation, watchdog timer operation, and battery backup switching. The device features a precision voltage monitor with ±2% tolerance and offers adjustable or fixed reset time delays. Designed for low-power applications, it supports CMOS RAM write protection and fast onboard gating of chip enable signals, ensuring reliable system operation under varying power conditions.

Supervisors Feature Summary

• Integrates complete single-chip solutions for power supply monitoring and battery control functions in microprocessor systems
• Provides automatic battery backup power switching to maintain data integrity during power transitions
• Includes watchdog timer functionality to prevent software lockups and ensure system recovery
• Supports CMOS RAM write protection to safeguard critical data from corruption during brown-out events

Supervisors Applications

• Microprocessor systems requiring robust power supervision
• Computers and controllers needing automated reset and watchdog capabilities
• Intelligent instruments demanding precise voltage monitoring and battery switchover
• Automotive systems operating in critical power monitoring environments

Supervisors Procurement Notes

Verify the specific suffix 'AN' indicates the 16-pin DIP package variant when sourcing. Confirm operational temperature ranges and reset delay specifications against the official datasheet for the exact revision. Ensure compatibility with existing board layouts designed for through-hole mounting. Cross-reference part numbers with Analog Devices documentation to avoid confusion with surface-mount equivalents like the AARNZ series.

Supervisors Selection Notes

Select this component when through-hole mounting is required for supervisory circuits in microprocessor designs. Consider the ±2% voltage monitor tolerance and available reset delay options for system timing requirements. Evaluate the low standby current consumption for battery-powered applications. Verify that the integrated watchdog and battery backup features meet the specific reliability needs of the target application without requiring external components.

Supervisors Part Context

The ADM691AAN 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 products. The ADM691AAN specifically denotes the dual-in-line package version, offering designers flexibility in PCB layout compared to surface-mount alternatives while maintaining identical electrical performance and functional integration.

Supervisors Replacement Considerations

The ADM691AARNZ is a direct pin-compatible replacement in a surface-mount SOIC-16 package. For through-hole requirements, verify availability of other DIP variants within the same family. Legacy MAX691A parts may require level shifting or timing adjustments due to potential parameter differences.