24AA256UID-I/SN

Memory IC Overview

The Microchip Technology 24AA256UID-I/SN is a 256 Kbit (32K x 8) serial EEPROM featuring preprogrammed EUI-48 and EUI-64 node addresses alongside a unique 32-bit serial number. It operates on a single supply voltage ranging from 1.7V to 5.5V with a maximum clock frequency of 400 kHz. The device utilizes an I²C compatible 2-wire interface, supports page writes up to 64 bytes, and includes Schmitt trigger inputs for noise suppression. It is housed in an 8-lead SOIC package and functions within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Factory-programmed globally unique EUI-48 and EUI-64 node addresses stored in permanently write-protected memory regions.
• Integrated 32-bit unique serial number with manufacturer and device identifiers for scalable identification.
• Supports cascading up to eight devices on a single bus using configurable chip select inputs.
• Features output slope control to eliminate ground bounce and Schmitt trigger inputs for enhanced noise immunity.

Memory IC Applications

• Device identification and authentication in embedded systems
• Network node addressing for IoT and industrial automation
• Asset tracking and inventory management systems

Memory IC Procurement Notes

Verify the specific suffix 'I/SN' corresponds to the Industrial temperature grade (-40°C to +85°C) and the 8-lead SOIC package format. Confirm that the required application logic accounts for the permanently write-protected upper eighth of the array reserved for factory-programmed identifiers. Ensure the design accommodates the open-drain SDA line requirements with appropriate pull-up resistors for the target voltage level.

Memory IC Selection Notes

Select this component when permanent, globally unique hardware identification is required without external components. It is suitable for applications needing EUI-48 or EUI-64 compliance directly integrated into non-volatile storage. Consider the 1.7V minimum operating voltage for low-power designs. Verify that the 400 kHz speed meets system timing constraints, noting the reduction to 100 kHz at voltages below 2.5V.

Memory IC Part Context

This part belongs to the 24AA256UID family of serial EEPROMs designed by Microchip Technology. It shares the core 256 Kbit architecture and I²C interface with standard variants but distinguishes itself through factory-installed IEEE-compliant identifiers. The 'I' designation indicates industrial temperature rating, while 'SN' specifies the 8-lead Small Outline Integrated Circuit package type.

Memory IC Replacement Considerations

Standard 24AA256 variants lack the preprogrammed unique identifiers. Substitutes must be verified for identical pinout and electrical characteristics if identifier functionality is not critical to the new design.

Memory IC FAQ

Can the preprogrammed EUI-48 and EUI-64 addresses be modified?

No, these addresses are stored in the upper eighth of the EEPROM array which is permanently write-protected by hardware.

What is the maximum clock frequency at low supply voltages?

The maximum clock frequency is limited to 100 kHz when the supply voltage (VCC) is between 1.7V and 2.5V.