25LC256-I/MF

Overview

The Microchip Technology 25LC256-I/MF is a 256 Kbit Serial Electrically Erasable PROM featuring a 32,768 x 8-bit organization. It operates via an SPI-compatible serial bus with a maximum clock frequency of 10 MHz and supports a supply voltage range of 2.5V to 5.5V. The device utilizes an 8-lead DFN package and is rated for industrial temperature operation from -40°C to +85°C.

Feature Summary

• Supports block write protection allowing configuration to protect none, one-quarter, one-half, or the entire memory array.
• Includes built-in power-on/off data protection circuitry and a dedicated write-protect pin for hardware security.
• Features a hold input that suspends serial communication without resetting the sequence, enabling host interrupt servicing.

Applications

• Data logging in industrial control systems
• Configuration storage for microcontroller-based devices
• Parameter retention in embedded sensor networks

Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature range (-40°C to +85°C) and 'MF' denotes the 8-lead DFN package. Confirm RoHS compliance status as per the latest manufacturer documentation before finalizing procurement specifications.

Selection Notes

Select this component when a non-volatile EEPROM solution with SPI interface is required for industrial environments. Ensure the system design accommodates the 8-lead DFN footprint and provides adequate decoupling for the specified voltage range.

Part Context

This part belongs to the 25LC256 family of 256 Kbit Serial EEPROMs manufactured by Microchip Technology. It shares functional compatibility with other variants in the series, differing primarily in operating voltage ranges, temperature ratings, and physical packaging options.

Replacement Considerations

Direct substitutes include other 25LC256 variants such as 25LC256-I/ST (TSSOP) or 25LC256-E/MF (Extended Temp). Verify package dimensions and thermal characteristics when substituting across different form factors.

FAQ

How is the write enable latch managed during operation?

The write enable latch must be explicitly set using the WREN instruction before any write operation can occur. It is automatically reset after a successful write cycle, upon power-up, or if a WRDI instruction is executed.

What is the function of the HOLD pin?

The HOLD pin allows the user to pause serial communication while the device is selected. Transitions on SI, SCK, and SO are ignored during this state, but the internal address pointer remains unchanged.