25AA256-I/SN

Memory IC Overview

The Microchip Technology 25AA256-I/SN 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. The device supports a supply voltage range of 1.8V to 5.5V and utilizes an 8-lead SOIC package. It functions within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Supports self-timed erase and write cycles with built-in power-on/off data protection circuitry.
• Includes block write protection capabilities allowing selection of none, one-quarter, one-half, or all array segments.
• Features a hold pin that suspends transmission during serial sequences without resetting the sequence state.

Memory IC Applications

• Data storage for microcontroller systems requiring non-volatile memory retention.
• Configuration parameter storage in industrial control environments.
• Calibration data preservation in sensor interfaces.

Memory IC Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range aligns with system requirements, as the 'AA' variant supports 1.8V operation unlike some family members. Ensure compatibility with existing SPI controller configurations before finalizing procurement.

Memory IC Selection Notes

Select this component when low-voltage operation down to 1.8V is necessary alongside standard SPI interface compatibility. The industrial temperature rating suits applications operating between -40°C and +85°C. Consider page write limitations where data must remain within single physical page boundaries to prevent unintended overwrites.

Memory IC Part Context

This part belongs to the 25XX256 family of 256 Kbit Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25LC256 but differs in minimum operating voltage specifications. The device is designed for direct interfacing with popular microcontroller families utilizing Serial Peripheral Interface protocols.

Memory IC Replacement Considerations

The 25LC256 serves as a functional substitute within the same family, though it requires a minimum supply voltage of 2.5V rather than 1.8V. Verify voltage tolerance levels in the target application circuit before substituting to ensure reliable operation at lower supply potentials.