24AA02E64T-I/OT

Memory IC Overview

The Microchip Technology 24AA02E64T-I/OT is a 2 Kbit Electrically Erasable PROM organized as two blocks of 128 x 8-bit memory. It features a 2-wire serial interface compatible with I2C protocols and operates on a single supply ranging from 1.7V to 5.5V. The device supports clock frequencies up to 400 kHz at VCC ≥ 2.5V, or 100 kHz at lower voltages. It includes a factory-programmed globally unique 64-bit node address stored in the upper half of the array, which is permanently write-protected. The component utilizes low-power CMOS technology with standby currents of 1 µA maximum for industrial temperature ranges.

Memory IC Feature Summary

• Factory pre-programmed with a globally unique 64-bit EUI-64™ node address stored in the upper half of the memory array.
• Features an 8-byte page write buffer to enhance data transfer efficiency during sequential write operations.
• Incorporates Schmitt trigger inputs and output slope control to suppress noise spikes and eliminate ground bounce.
• Includes hardware write protection for the upper half of the array (addresses 80h-FFh) while allowing full access to the remaining memory.

Memory IC Applications

• Network devices requiring unique hardware identification via IEEE standards
• Low-voltage embedded systems needing non-volatile storage for configuration data
• I2C bus expansion modules utilizing contiguous addressing capabilities

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the 'T' indicates tape and reel packaging. Confirm the temperature grade corresponds to your operational environment; the 'I' suffix denotes Industrial range (-40°C to +85°C). Ensure the design accounts for the permanent write-protection of the upper memory half reserved for the node address. Cross-reference the datasheet revision to confirm pinout compatibility if substituting older versions.

Memory IC Selection Notes

Select this component when a unique hardware identifier is required without software overhead for generation. It is suitable for applications where power consumption must be minimized, given the low standby current specifications. Consider the 8-byte page buffer size when designing write algorithms to optimize bus throughput. Verify that the system voltage remains within the 1.7V to 5.5V range to ensure proper operation of the internal voltage detectors and logic levels.

Memory IC Part Context

This device belongs to the 24AA02XEXX family of 2 Kbit serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 24AA02E48 but differs in the length of its pre-programmed node address. The family is designed for compact surface-mount applications, offering both SOIC and SOT-23 package options to accommodate space-constrained printed circuit board layouts.

Memory IC Replacement Considerations

The 24AA02E48T-I/OT serves as a direct substitute if a 48-bit EUI-48™ address is acceptable instead of 64-bit. Other members of the 24AA02 series may replace this part if node identity features are not required by the application design.

Memory IC FAQ

Can the pre-programmed 64-bit node address be modified?

No, the node address is stored in the upper half of the array (addresses F8h-FFh) and is permanently write-protected by hardware.

How does the device handle writes across page boundaries?

If a page write command attempts to cross a physical page boundary, the data wraps around to the beginning of the current page rather than writing to the next page.