25LC256T-I/SM

Overview

The Microchip Technology 25LC256T-I/SM 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 clock frequencies up to 10 MHz. The device features self-timed erase and write cycles with a maximum duration of 5 ms. It includes block write protection, power-on data protection, and a hold pin for pausing communication. The component is housed in an 8-SOIJ package and is rated for industrial temperatures from -40°C to +85°C.

Feature Summary

• Supports sequential read operations and page writes of up to 64 bytes within a single physical page boundary.
• Includes hardware write-protect functionality controlled by the WP pin and STATUS register bits.
• Features a HOLD input to pause serial communication without resetting the sequence.

Applications

• Microcontroller systems requiring non-volatile storage for configuration parameters.
• Industrial sensor nodes needing reliable data retention.
• Embedded devices utilizing standard SPI interfaces for memory expansion.

Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C) and 'SM' indicates the 8-SOIJ package. Confirm the 'T' prefix denotes tape and reel packaging if required for automated assembly. Ensure the specific revision matches the design requirements as datasheet revisions may occur.

Selection Notes

Select this part when a 256 Kbit capacity is needed with SPI interface compatibility. It is suitable for applications requiring low standby current and high endurance. Consider the 8-SOIJ package constraints for PCB layout. Verify voltage levels match the system's 2.5V to 5.5V operating range.

Part Context

This component belongs to the 25LC256 family of Serial EEPROMs from Microchip Technology. It shares functional similarities with the 25AA256 but differs in minimum operating voltage. The 'T' suffix typically indicates tape and reel packaging, while 'I' specifies the industrial temperature grade. It is designed for direct interfacing with microcontrollers supporting SPI protocols.

Replacement Considerations

The 25LC256-E/SM is available as an extended temperature variant (-40°C to +125°C). Other packages such as TSSOP (ST) or SOIC (SN) offer alternative form factors with identical electrical characteristics. Cross-reference with 25AA256 variants only if lower voltage operation is not required.