24LC256-E/SM

Memory IC Overview

The Microchip Technology 24LC256-E/SM is a 32K x 8 (256-Kbit) Serial Electrically Erasable PROM (EEPROM). It operates with a single supply voltage ranging from 2.5V to 5.5V and supports a maximum clock frequency of 400 kHz via a two-wire I2C compatible interface. The device features a 64-byte page write buffer, hardware write-protect capability, and Schmitt trigger inputs for noise suppression. It is qualified under the Automotive AEC-Q100 standard and offers 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 functional address lines.
• Includes hardware write-protect functionality controlled by the WP pin.
• Features output slope control designed to eliminate ground bounce.
• Provides ESD protection exceeding 4000V.

Memory IC Applications

• Personal communications systems
• Data acquisition applications
• Advanced low-power electronic designs

Memory IC Procurement Notes

Verify that the ordering suffix 'E' corresponds to the Extended temperature range (-40°C to +125°C) and 'SM' indicates the 8-Lead SOIJ package. Confirm the specific voltage operating range requirements align with the 2.5V minimum specification for the 24LC256 series before finalizing procurement.

Memory IC Selection Notes

Select this component when an automotive-grade EEPROM with an extended temperature range is required. Ensure the system voltage does not drop below 2.5V, as lower voltages restrict the maximum clock frequency to 100 kHz. Verify that the 8-pin SOIJ package dimensions fit the target PCB layout constraints.

Memory IC Part Context

This part belongs to the 24XX256 family of 256-Kbit Serial EEPROMs manufactured by Microchip Technology. It shares architectural similarities with the 24AA256 and 24FC256 models but differs in its specific voltage operating range and maximum clock frequency specifications.

Memory IC Replacement Considerations

The 24LC256T-E/SM serves as a tape-and-reel replacement variant offering identical electrical characteristics and functionality within the same package type.

Memory IC FAQ

How many devices can be connected to the same I2C bus?

Up to eight 24LC256 devices can be connected to the same bus by utilizing different combinations of the Chip Select bits (A2, A1, A0).

What is the function of the WP pin?

The Write-Protect (WP) pin allows hardware protection of the entire memory array. Tying it to VCC inhibits write operations, while tying it to VSS enables them.