24LC256T-I/SN

Memory IC Overview

The Microchip Technology 24LC256T-I/SN 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 I²C two-wire serial interface communication with a maximum clock frequency of 400 kHz. The device features a 64-byte page write buffer, hardware write protection via the WP pin, and Schmitt trigger inputs for noise suppression. It is qualified under AEC-Q100 standards for automotive applications and offers over one million erase/write cycles with data retention exceeding 200 years.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using functional address lines A0, A1, and A2.
• Includes hardware write protection that inhibits write operations when the WP pin is tied to VCC.
• Features output slope control designed to eliminate ground bounce during operation.

Memory IC Applications

• Automotive electronic systems requiring AEC-Q100 qualification
• Personal communications devices
• Data acquisition systems

Memory IC Procurement Notes

Verify the specific suffix 'SN' corresponds to the 8-lead SOIC package type required for your surface mount design. Confirm the 'I' designation matches the industrial temperature range specifications (-40°C to +85°C). Ensure the 'T' indicates tape and reel packaging if automated assembly is planned. Cross-reference the datasheet revision to confirm current electrical characteristics and pinout configurations before finalizing procurement.

Memory IC Selection Notes

Select this component when an I²C-compatible EEPROM with automotive reliability is needed. It is suitable for designs operating between 2.5V and 5.5V. Consider alternatives like the 24AA256 or 24FC256 only if lower voltage operation down to 1.7V or higher clock speeds are required. Verify that the 400 kHz speed limit meets system timing requirements.

Memory IC Part Context

This part belongs to the 24XX256 family of 256-Kbit serial EEPROMs manufactured by Microchip Technology. The family includes variants such as the 24AA256 and 24FC256, which share similar interfaces but differ in voltage ranges and clock speeds. The 24LC256 series specifically targets applications requiring operation down to 2.5V.

Memory IC Replacement Considerations

Public confirmed substitute part numbers include 24LC256-I/SN and 24LC256T-I/ST.

Memory IC FAQ

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

Up to eight devices can be connected to the same bus by utilizing different combinations of the chip select bits A0, A1, and A2.

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.