24LC256T-I/ST

Memory IC Overview

The Microchip Technology 24LC256T-I/ST is a 256-Kbit (32K x 8) serial EEPROM utilizing an I²C-compatible two-wire interface. It operates within a supply voltage range of 2.5V to 5.5V and supports clock frequencies up to 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 housed in an 8-lead TSSOP surface-mount package and functions reliably across an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Supports cascading up to eight devices on a single bus using functional address lines A0, A1, and A2.
• Includes a 64-byte page write buffer to optimize data transfer efficiency.
• Features hardware write protection controlled by the WP pin to prevent unintended memory modifications.
• Incorporates Schmitt trigger inputs and output slope control to suppress noise and eliminate ground bounce.

Memory IC Applications

• Personal communications systems requiring non-volatile data storage
• Data acquisition applications needing reliable parameter retention
• Industrial control systems operating within standard temperature ranges

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range compatibility with the target system design, as the 'LC' variant requires a minimum of 2.5V. Ensure the procurement documentation aligns with the manufacturer's official specifications for the 24LC256 series.

Memory IC Selection Notes

Select this component when a 256-Kbit capacity and I²C interface are required. Choose the 'I' suffix for industrial temperature operation (-40°C to +85°C). Opt for the 'ST' suffix specifically for the 8-lead TSSOP surface-mount package configuration. Ensure the application voltage remains above 2.5V to maintain full 400 kHz clock speed capabilities.

Memory IC Part Context

This part belongs to the 24XX256 family, which includes the 24AA256 and 24FC256 variants. While sharing similar architecture, the 24LC256 is distinguished by its 2.5V minimum operating voltage compared to the 1.7V minimum of the AA and FC series. All variants offer 256-Kbit capacity and I²C connectivity.

Memory IC Replacement Considerations

The 24AA256T-I/ST serves as a direct substitute if the application supports a lower 1.7V minimum supply voltage. The 24FC256T-I/ST offers higher speed capability but requires verification of voltage and timing constraints. Package and pinout remain identical across these family members.

Memory IC FAQ

How does the WP pin function?

Connecting the WP pin to VCC inhibits all write operations while allowing reads. Connecting it to VSS enables write operations.

What is the maximum number of devices on one bus?

Up to eight 24LC256 devices can be connected to the same I²C bus using different combinations of the A0, A1, and A2 address pins.

What happens during a page write crossing a boundary?

If a page write attempts to cross a physical page boundary, the data wraps around to the beginning of the current page instead of proceeding to the next page.