25AA256T-E/MF

Memory IC Overview

The Microchip Technology 25AA256T-E/MF 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. The device operates within a supply voltage range of 1.8V to 5.5V and supports extended temperature ranges from -40°C to +125°C. It includes block write protection, self-timed erase/write cycles, and high reliability specifications.

Memory IC Feature Summary

• Supports up to 1,000,000 erase/write cycles with data retention exceeding 200 years.
• Features programmable 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.
• Provides a HOLD input to pause serial communication without resetting the sequence.

Memory IC Applications

• Microcontroller system data storage
• Configuration parameter storage
• Calibration data retention

Memory IC Procurement Notes

Verify that the ordering suffix 'MF' corresponds to the 8-lead DFN package type as specified in the datasheet. Confirm the 'E' suffix indicates the extended temperature range (-40°C to +125°C) and the 'T' indicates tape and reel packaging. Ensure the voltage range requirements align with the 1.8V to 5.5V specification for the 25AA series.

Memory IC Selection Notes

Select this component when low-voltage operation down to 1.8V is required, distinguishing it from the 25LC256 which starts at 2.5V. Choose the E suffix for applications requiring operation up to +125°C ambient temperature. The MF package designation indicates a specific surface-mount footprint; verify PCB layout compatibility against the DFN-8 mechanical drawing.

Memory IC Part Context

This part belongs to the 25XX256 family of 256 Kbit SPI Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25LC256 but differs in minimum operating voltage. The family supports standard SPI modes and includes features like page writes and hardware write protection via the WP pin.

Memory IC Replacement Considerations

25LC256T-E/MF

Memory IC 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 pins are ignored while held low.

What is the purpose of the WPEN bit in the STATUS register?

The WPEN bit enables the hardware write-protect feature controlled by the WP pin. When WPEN is high and the WP pin is low, writing to nonvolatile bits in the STATUS register is disabled.