24AA025E64T-E/OT

Memory IC Overview

The Microchip Technology 24AA025E64T-E/OT is a 2 Kbit Electrically Erasable PROM organized as two blocks of 128 x 8-bit memory. It features a 2-wire serial I2C interface with a maximum clock frequency of 400 kHz (100 kHz below 2.5V). The device operates on a single supply ranging from 1.7V to 5.5V and supports an extended temperature range of -40°C to +125°C. It includes a 16-byte page write buffer, pre-programmed globally unique EUI-64™ node address, and output slope control.

Memory IC Feature Summary

• Factory programmed with a globally unique 64-bit EUI-64™ node address stored in the upper half of the array for permanent identification.
• Features Schmitt trigger inputs and noise suppression filters to ensure reliable operation on noisy buses.
• Includes output slope control circuitry designed to eliminate ground bounce during switching operations.
• Supports acknowledge polling to maximize bus throughput by allowing the master to detect when internal write cycles are complete.

Memory IC Applications

• System identification and tracking using IEEE-compliant EUI-64™ addresses
• Low-voltage embedded systems requiring robust noise immunity
• I2C bus expansion with multiple devices sharing the same address space

Memory IC Procurement Notes

Verify that the ordering suffix 'E' corresponds to the Automotive temperature grade (-40°C to +125°C) rather than the Industrial grade. Confirm the package type matches the required board layout, specifically the 6-lead SOT-23 configuration. Ensure the application voltage remains within the specified 1.7V to 5.5V range to maintain data retention and endurance specifications.

Memory IC Selection Notes

Select this component when a permanently unique hardware identifier is required for each unit without external programming. The E-Temp rating is necessary for environments exceeding standard industrial limits. The 6-lead SOT-23 package is suitable for high-density surface mount designs where space is constrained compared to SOIC packages.

Memory IC Part Context

This part belongs to the 24AA02XEXX family of 2 Kbit serial EEPROMs. It shares functional similarities with the 24AA025E48 but differs in its pre-programmed address length (64-bit vs 48-bit). It is distinct from non-addressed variants like the 24AA025 due to the integrated node identity feature.

Memory IC Replacement Considerations

Direct substitutes include other 24AA025E64 variants with different temperature ratings or packages, such as 24AA025E64-I/OT or 24AA025E64-I/SN. Verify that any replacement maintains the EUI-64™ address format if system software relies on the specific 8-byte node structure.

Memory IC FAQ

Can the pre-programmed EUI-64™ node address be modified?

No, the node address is stored in the upper half of the array (addresses 0xF8 through 0xFF) and is permanently write-protected at the factory.

How many devices can be connected to a single I2C bus?

Up to four 24AA025E64 devices can be connected to the same bus using the 6-lead SOT-23 package, as only two chip select bits (A0, A1) are available.

What is the purpose of the output slope control?

Output slope control is implemented to eliminate ground bounce, which improves signal integrity and reduces electromagnetic interference during fast switching transitions.