24LC256T-E/SM

Memory IC Overview

The Microchip Technology 24LC256T-E/SM is a 256-Kbit (32K x 8) serial electrically erasable programmable read-only memory (EEPROM). It operates on a single supply voltage ranging from 2.5V to 5.5V and supports a maximum clock frequency of 400 kHz via an I²C compatible two-wire serial interface. The device features a 900 ns access time, a 64-byte page write buffer, and a maximum write cycle time of 5 ms. It is housed in an 8-lead Small Outline Junction (SOIJ) package and is rated for extended industrial temperature operation 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 controlled by the WP pin to inhibit array writes when tied high.
• Provides self-timed erase/write cycles with automatic acknowledge polling capability.

Memory IC Applications

• Personal communications systems requiring non-volatile data storage
• Data acquisition applications needing low-power memory solutions
• Industrial control systems operating across extended temperature ranges

Memory IC Procurement Notes

Verify that the ordering suffix 'E' confirms the extended temperature range (-40°C to +125°C) and the 'SM' suffix specifies the 8-lead SOIJ package. Confirm the 'T' indicates tape-and-reel packaging. Ensure the component meets RoHS compliance requirements for your specific manufacturing process.

Memory IC Selection Notes

Select this part when a 256-Kbit capacity is required with I²C compatibility. The 2.5V minimum supply voltage distinguishes it from lower-voltage variants like the 24AA256. The SOIJ package is suitable for surface-mount assembly where space constraints differ from standard SOIC dimensions.

Memory IC Part Context

This component belongs to the 24XX256 family, which includes the 24AA256 and 24FC256 variants. While sharing the same memory architecture and interface, the 24LC256 is specifically optimized for a 2.5V to 5.5V operating range, unlike the 24AA256 which supports down to 1.7V.

Memory IC Replacement Considerations

The 24LC256-E/SM is a direct equivalent for the 24LC256T-E/SM if tube packaging is acceptable instead of tape-and-reel. Cross-family replacements like the 24AA256 or 24FC256 require verification of voltage and speed compatibility.