25LC256X-E/ST

Overview

The Microchip Technology 25LC256X-E/ST is a 256 Kbit (32,768 x 8-bit) Serial Electrically Erasable PROM. It utilizes an SPI-compatible serial bus for communication, supporting clock frequencies up to 10 MHz. The device operates within a supply voltage range of 2.5 V to 5.5 V and features low-power CMOS technology with standby current as low as 1 µA. It offers high reliability with 1,000,000 erase/write cycle endurance and data retention exceeding 200 years. The component supports extended temperature ranges from -40°C to +125°C and includes hardware write protection capabilities.

Feature Summary

• Supports sequential read operations and page writes of up to 64 bytes within a single physical page boundary.
• Includes built-in write protection mechanisms such as power-on/off data protection, a write enable latch, and a dedicated write-protect pin.
• Features block write protection allowing users to protect none, one-quarter, one-half, or the entire memory array via status register configuration.

Applications

• Microcontroller systems requiring non-volatile storage for configuration parameters
• Embedded applications needing persistent data logging or calibration values
• Industrial control devices operating in extended temperature environments

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm that the 'E' designation corresponds to the extended industrial temperature range (-40°C to +125°C). Ensure compatibility with the system's SPI interface timing requirements and voltage levels before integration.

Selection Notes

Select this component when a 256 Kbit capacity is required with SPI interface compatibility. The extended temperature variant is suitable for harsh environments. Consider the 64-byte page size for write efficiency and ensure the application can manage the write enable latch sequence for reliable data persistence.

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 minimum operating voltage. The family is designed for general-purpose non-volatile memory applications where low power consumption and high endurance are critical.

Replacement Considerations

The 25LC256-I/ST is a compatible alternative offering the same functionality within the industrial temperature range (-40°C to +85°C).