25LC256T-E/SN

Overview

The Microchip Technology 25LC256T-E/SN 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 a 64-byte page size, self-timed erase/write cycles with a maximum duration of 5 ms, and extended temperature support from -40°C to +125°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
• Features a HOLD pin to pause serial communication without resetting the sequence
• Provides high reliability with over 1,000,000 erase/write cycles and greater than 200 years of data retention

Applications

• Microcontroller system configuration storage
• Calibration parameter persistence
• User setting retention in embedded devices

Procurement Notes

Verify that the 'E' suffix confirms the Extended temperature range (-40°C to +125°C) and the 'SN' suffix specifies the 8-lead SOIC package. Confirm the 'T' suffix indicates tape-and-reel packaging if required by automated assembly processes. Ensure the specific revision matches the datasheet DS20001822H.

Selection Notes

Select this component when an SPI interface is preferred over I2C or Microwire protocols. Choose the 25LC256T-E/SN specifically for applications requiring operation at temperatures up to +125°C. The 256 Kbit capacity is suitable for moderate data storage needs where non-volatile retention is critical.

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 operating voltage ranges. The device is designed for direct interfacing with microcontrollers supporting standard SPI ports.

Replacement Considerations

The 25LC256I/SN serves as a lower-temperature alternative (-40°C to +85°C). Cross-reference with other 25LC256 variants only if package or temperature requirements differ.

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin suspends transmission to the device while in the middle of a serial sequence without resetting the sequence. Transitions on SI, SCK, and SO are ignored while held low.

What happens if a page write crosses a physical page boundary?

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