24LC256T-E/SN

Memory IC Overview

The Microchip Technology 24LC256T-E/SN is a 256-Kbit (32K x 8) serial EEPROM featuring an I²C-compatible two-wire interface. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 400 kHz. The device utilizes an 8-lead SOIC surface-mount package and includes a 64-byte page write buffer with a maximum write cycle time of 5 ms. It offers high endurance exceeding one million erase/write cycles and data retention for over 200 years, functioning reliably across an extended temperature range from -40°C to +125°C.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using hardware address inputs A0, A1, and A2.
• Includes Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.
• Features hardware write protection via the WP pin to inhibit array writes while maintaining read access.
• Provides acknowledge polling capability to maximize bus throughput during internal write cycles.

Memory IC Applications

• Personal communications systems requiring non-volatile data storage
• Data acquisition applications needing reliable parameter retention
• Industrial control systems operating in extended temperature environments

Memory IC Procurement Notes

Verify that the ordering suffix matches the required specifications: 'E' indicates Extended temperature range (-40°C to +125°C), 'SN' denotes the 8-lead SOIC package, and 'T' signifies tape-and-reel packaging. Confirm RoHS compliance status as per the latest manufacturer documentation before finalizing procurement orders.

Memory IC Selection Notes

Select this component when a 256-Kbit capacity is required with I²C connectivity. Ensure the system voltage remains above 2.5V, as lower voltages restrict the maximum clock frequency to 100 kHz. Consider the 8-lead SOIC form factor for surface-mount assembly requirements and verify that the application can accommodate the necessary pull-up resistors for the SDA and SCL lines.

Memory IC Part Context

This part belongs to the 24XX256 family of serial EEPROMs manufactured by Microchip Technology. The family includes variants like the 24AA256 and 24FC256, which differ primarily in minimum operating voltage and maximum clock speed capabilities. The 24LC256 variant specifically targets applications requiring operation down to 2.5V with standard I²C speeds.

Memory IC Replacement Considerations

Direct functional substitutes within the same package include other 24LC256 variants such as 24LC256-I/SN or 24LC256-E/MS, provided the temperature grade and package type align with design constraints. Cross-family replacements like 24AA256 require verification of voltage compatibility.