24LC256-E/ST

Memory IC Overview

The Microchip Technology 24LC256-E/ST 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 an access time of 900 ns and utilizes an 8-lead TSSOP surface-mount package. It is rated for extended 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.
• Includes Schmitt trigger inputs for enhanced noise suppression and output slope control to eliminate ground bounce.
• Features a 64-byte page write buffer for efficient data transfer operations.
• Provides hardware write protection through the WP pin to secure memory arrays.

Memory IC Applications

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

Memory IC Procurement Notes

Verify that the ordering suffix matches the required specifications. Confirm the 'E' suffix indicates Extended temperature range (-40°C to +125°C) and the '/ST' suffix denotes the 8-lead TSSOP package. Ensure the voltage range requirement aligns with the 2.5V minimum specification for the 24LC256 series.

Memory IC Selection Notes

Select this component when a 256-Kbit non-volatile memory solution is required with I2C compatibility. The 24LC256 variant specifically requires a minimum operating voltage of 2.5V, distinguishing it from lower-voltage alternatives in the family. The TSSOP package is suitable for surface-mount assembly processes requiring compact footprint solutions.

Memory IC Part Context

This part belongs to the 24XX256 family, which includes the 24AA256 and 24FC256 variants. While sharing the same memory architecture and interface, the 24LC256 is distinguished by its specific 2.5V to 5.5V operating voltage range and 400 kHz maximum clock speed capability.

Memory IC Replacement Considerations

The 24LC256T-E/ST serves as a tape-and-reel replacement for the tube-packaged 24LC256-E/ST. Other packages within the same electrical specification include MSOP, SOIC, and PDIP variants.

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 A0, A1, and A2 chip select pins.

What is the function of the WP pin?

The Write-Protect (WP) pin allows hardware protection of the entire memory array. When tied to VCC, write operations are inhibited, while read operations remain unaffected.