25LC256T-I/SN

Overview

The Microchip Technology 25LC256T-I/SN is a 256 Kbit (32K x 8) Serial Electrically Erasable PROM accessed via an SPI-compatible serial bus. It operates within a supply voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz. The device features a 64-byte page size, self-timed erase/write cycles with a maximum duration of 5 ms, and industrial temperature ratings from -40°C to +85°C. It is housed in an 8-lead SOIC package.

Feature Summary

• Supports block write protection for none, 1/4, 1/2, or all of the memory array
• Includes built-in power-on/off data protection circuitry and a write enable latch
• Provides sequential read capability with automatic address pointer incrementation
• Features a hold pin to pause serial communication without resetting the sequence

Applications

• Data storage for microcontroller systems requiring non-volatile memory
• Configuration parameter retention in embedded devices
• Calibration data storage for sensor interfaces
• Firmware version tracking and logging applications

Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C) and 'SN' indicates the 8-lead SOIC package. Confirm the 'T' suffix denotes tape and reel packaging if required by assembly equipment. Ensure the specific variant matches the 2.5V minimum operating voltage requirement rather than the 1.8V AA series.

Selection Notes

Select this component when a 256 Kbit capacity with SPI interface is required for industrial environments. The 2.5V to 5.5V operating range suits systems where lower voltage operation below 2.5V is not necessary. Consider the 64-byte page size for write efficiency and verify that the 10 MHz clock speed meets system timing constraints.

Part Context

This part belongs to the 25LC256 family of Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA256 but differs in its minimum operating voltage specification. The device is designed for high reliability with over one million erase/write cycles and data retention exceeding 200 years.

Replacement Considerations

The 25LC256-I/SN is a direct equivalent without the tape and reel suffix. The 25AA256T-I/SN offers similar functionality but supports a wider voltage range down to 1.8V.