25LC1024-E/MF

Overview

The Microchip Technology 25LC1024-E/MF is a 1-Mbit (131,072-byte) serial EEPROM utilizing an SPI-compatible interface. It supports clock frequencies up to 20 MHz and operates within a supply voltage range of 2.5V to 5.5V. The device features a 256-byte page write buffer and self-timed erase/write cycles with a maximum duration of 6 ms. It offers high reliability with 1 million erase/write endurance cycles and data retention exceeding 200 years. The -E suffix indicates an extended industrial temperature range from -40°C to +125°C, housed in an 8-lead DFN-S package.

Feature Summary

• Supports byte-level and page-level write operations with a 256-byte page size.
• Includes sector, page, and chip erase instructions for flexible memory management.
• Features hardware write protection via the WP pin and software protection via the STATUS register.
• Provides a HOLD function to pause serial communication without resetting the sequence.

Applications

• Data logging in industrial control systems
• Configuration storage for microcontrollers
• Calibration data retention in automotive electronics

Procurement Notes

Verify that the ordering suffix matches the required specifications. The 'E' designation confirms the extended temperature range (-40°C to +125°C), while 'MF' specifies the 8-lead DFN-S package. Confirm RoHS compliance status and ensure the specific datasheet revision aligns with your design requirements before finalizing procurement.

Selection Notes

Select this component when an SPI interface is required for non-volatile storage in high-temperature environments. The 1-Mbit capacity suits applications needing substantial configuration or log data storage. Ensure the host controller supports the necessary SPI modes and can handle the 24-bit address space. Verify power supply stability within the 2.5V to 5.5V range to maintain performance.

Part Context

This part belongs to the 25LC1024 series of 1-Mbit serial EEPROMs manufactured by Microchip Technology. The series includes variants with different temperature ratings and packages. The 25LC1024 is designed for applications requiring high endurance and long-term data retention, serving as a reliable alternative to flash memory in systems where frequent small writes are not required.

Replacement Considerations

Compatible substitutes include other 1-Mbit SPI EEPROMs from Microchip such as the 25AA1024 or 25LC1024-I/MF. When replacing, verify that the substitute matches the package type, voltage range, and temperature rating. Ensure the replacement supports the same SPI timing parameters and instruction set to maintain firmware compatibility.

FAQ

What is the maximum clock frequency for the 25LC1024?

The device supports a maximum clock frequency of 20 MHz when the supply voltage is between 4.5V and 5.5V. At lower voltages (2.5V to less than 5.5V), the maximum frequency is reduced to 10 MHz.

How does the HOLD pin function during operation?

The HOLD pin allows the user to pause serial communication without resetting the sequence. Pulling HOLD low suspends data transfer on the SO line, while transitions on SI and SCK are ignored. Communication resumes when HOLD is pulled high while SCK is low.

Can the 25LC1024 be written to if the WP pin is grounded?

Yes, if the WPEN bit in the STATUS register is cleared (low). In this state, the WP pin function is disabled, allowing writes to proceed even if the WP pin is held low. If WPEN is set (high), grounding the WP pin will prevent writes to the array.