25LC256-I/ST

Overview

The Microchip Technology 25LC256-I/ST is a 256 Kbit Serial Electrically Erasable PROM featuring a 32,768 x 8-bit organization. It utilizes an SPI-compatible serial bus with a maximum clock frequency of 10 MHz and operates within a supply voltage range of 2.5V to 5.5V. The device supports self-timed erase and write cycles with a maximum duration of 5 ms. It includes block write protection capabilities and built-in power-on/off data protection circuitry. The component is housed in an 8-lead TSSOP package and is rated for industrial temperature operation from -40°C to +85°C.

Feature Summary

• Supports high-speed SPI communication with sequential read capabilities and hold functionality for interrupt servicing
• Includes programmable block write protection and hardware write-protect pin control via status register configuration
• Features nonvolatile memory architecture with robust endurance ratings and extended data retention specifications

Applications

• Data storage for microcontroller systems requiring persistent parameter retention
• Configuration memory for embedded devices needing frequent updates
• Industrial control applications requiring reliable nonvolatile storage under varying temperatures

Procurement Notes

Verify the specific suffix 'I' confirms the Industrial temperature range (-40°C to +85°C) and 'ST' denotes the 8-TSSOP package. Confirm that the device meets RoHS compliance requirements if applicable to your manufacturing standards. Ensure the design accounts for the 64-byte page write boundary restrictions during software implementation.

Selection Notes

Select this component when an SPI interface is preferred over I2C or Microwire protocols. It is suitable for designs requiring a wide operating voltage range up to 5.5V. Consider the 64-byte page size limitation for write operations and ensure the application logic handles page boundary wrapping correctly to prevent data corruption.

Part Context

This part belongs to the 25XX256 family of Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA256 but differs in minimum operating voltage. The device is designed to interface directly with popular microcontroller families, including PIC microcontrollers, utilizing standard SPI signals.

Replacement Considerations

The 25AA256-I/ST is a compatible alternative within the same datasheet, offering a lower minimum supply voltage of 1.8V compared to the 2.5V minimum of the 25LC256 series.