24LC256-E/MF

Memory IC Overview

The Microchip Technology 24LC256-E/MF is a 256-kbit (32K x 8) serial EEPROM featuring an I²C-compatible two-wire interface. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 400 kHz. The device utilizes an 8-lead DFN package and functions across an extended temperature range from -40°C to +125°C. Key electrical characteristics include a maximum write current of 3 mA, standby current of 1.5 µA at 5.5V, and access times of 900 ns.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using hardware address inputs for expanded addressing.
• Includes Schmitt trigger inputs and output slope control to suppress noise and eliminate ground bounce.
• Features a 64-byte page write buffer with self-timed erase/write cycles and hardware write protection via the WP pin.

Memory IC Applications

• Personal communications systems requiring non-volatile data storage
• Data acquisition applications needing reliable parameter retention
• Embedded systems utilizing I²C bus architectures

Memory IC Procurement Notes

Verify that the ordering suffix 'MF' corresponds specifically to the 8-lead DFN package type required for your PCB layout. Confirm the 'E' suffix indicates the Extended temperature grade (-40°C to +125°C), as opposed to the Industrial grade. Ensure voltage supply constraints align with the specified 2.5V minimum operating threshold for this specific variant.

Memory IC Selection Notes

Select this component when an 8-lead DFN footprint is necessary for space-constrained designs. The Extended temperature rating makes it suitable for harsh environments where standard industrial grades may fail. Consider the 400 kHz speed limit if higher throughput is required, as faster variants exist in the family.

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 operating voltage ranges and maximum clock speeds. All share the same core memory architecture and I²C protocol compatibility.

Memory IC Replacement Considerations

Direct replacements include other 24LC256 variants in different packages such as 24LC256-E/MS or 24LC256-E/SN, provided the physical footprint change is acceptable. Cross-family substitutes like 24AA256 or 24FC256 are functionally compatible but require verification of voltage and speed specifications against system requirements.

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 configuring the A0, A1, and A2 chip select pins to unique logic levels.

What is the function of the WP pin?

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

Does the device support acknowledge polling?

Yes, the device does not generate Acknowledge signals during an internal write cycle, allowing the host to poll the bus to determine when the write operation is complete.