24LC256-E/SN

Memory IC Overview

The Microchip Technology 24LC256-E/SN is a 32K x 8 (256 Kbit) Serial Electrically Erasable PROM (EEPROM). It operates with a supply voltage range of 2.5V to 5.5V and supports I²C compatible two-wire serial interfaces at maximum clock frequencies up to 400 kHz. The device features a 64-byte page write buffer, hardware write-protect capability, and Schmitt trigger inputs for noise suppression. It is housed in an 8-SOIC package and rated for extended industrial temperature ranges from -40°C to +125°C.

Memory IC Feature Summary

• Supports bidirectional data transfer via a standard two-wire I²C compatible serial interface.
• Includes a 64-byte page write buffer to optimize sequential data writing operations.
• Features hardware write protection controlled by the WP pin to secure memory arrays.
• Provides high electrostatic discharge protection exceeding 4000V on all pins.

Memory IC Applications

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

Memory IC Procurement Notes

Verify that the ordering suffix 'E' confirms the Extended temperature rating (-40°C to +125°C) and 'SN' specifies the 8-Lead SOIC package. Confirm the specific revision level against the latest datasheet DS20001203Y to ensure compatibility with current manufacturing standards and RoHS compliance requirements.

Memory IC Selection Notes

Select this component when operation requires a minimum supply voltage of 2.5V, distinguishing it from the 24AA256 variant which supports lower voltages down to 1.7V. Ensure the application environment necessitates the Extended temperature grade rather than the Industrial grade. Verify that the 400 kHz maximum clock frequency aligns with the system bus speed 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 like the 24AA256 and 24FC256, which differ primarily in voltage ranges and clock speeds. The 24LC256 specifically targets applications requiring stable operation between 2.5V and 5.5V with standard I²C timing constraints.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: 24LC256-I/SN, 24LC256-E/MS, 24LC256T-E/MS.

Memory IC FAQ

How does the WP pin function regarding write protection?

When the WP pin is tied to VCC, write operations are inhibited while read operations remain unaffected. Tying the pin to VSS enables write operations.

What is the maximum number of devices that can be connected to the same bus?

Up to eight devices can be cascaded on the same bus using the functional address lines A0, A1, and A2 to create unique chip select combinations.