25LC256X-I/ST

Overview

The Microchip Technology 25LC256X-I/ST is a 256 Kbit (32K x 8) Serial Electrically Erasable PROM accessed via an SPI-compatible bus. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz at 5.5V. 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 TSSOP package.

Feature Summary

• Supports block write protection for none, 1/4, 1/2, or all of the memory array via status register configuration.
• Includes built-in power-on/off data protection circuitry and a write enable latch to prevent inadvertent writes.
• Features a HOLD input pin that allows suspension of serial communication without resetting the sequence.

Applications

• Configuration storage in microcontroller-based systems
• Calibration parameter persistence
• Data logging and event recording

Procurement Notes

Verify the specific suffix 'X' against official Microchip documentation, as standard datasheets list 'I/ST' without this character. Confirm RoHS compliance status and ensure the Industrial temperature grade (-40°C to +85°C) matches application requirements. Check for any recent Product Change Notifications regarding packaging or assembly changes.

Selection Notes

Select this component for applications requiring non-volatile storage accessible via standard SPI interfaces. Ensure the system voltage remains within the 2.5V to 5.5V operating range. Consider the 64-byte page write limitation when designing firmware to avoid data corruption across page boundaries.

Part Context

This part belongs to the 25LC256 family of 256 Kbit Serial EEPROMs manufactured by Microchip Technology. It shares functional compatibility with the 25AA256 series, differing primarily in minimum operating voltage specifications. The device is designed for high-reliability embedded memory applications requiring robust data retention.

Replacement Considerations

Direct replacements include the 25LC256-I/ST and 25AA256-I/ST. Verify voltage compatibility if substituting with the 25AA256 variant, which supports lower voltages down to 1.8V.