25AA640A-I/SN

Memory IC Overview

The Microchip Technology 25AA640A-I/SN is a 64-Kbit (8192 x 8-bit) Serial Electrically Erasable PROM featuring an SPI-compatible interface. It operates within a voltage range of 1.8V to 5.5V and supports clock frequencies up to 10 MHz at 5.5V. The device utilizes low-power CMOS technology with standby current as low as 1 µA. It includes hardware write protection, block protection capabilities, and self-timed erase/write cycles with a maximum duration of 5 ms.

Memory IC Feature Summary

• Supports high-speed serial communication via SPI bus with clock frequencies up to 10 MHz
• Includes built-in power-on/off data protection and a write enable latch mechanism
• Offers flexible block write protection allowing selection of none, 1/4, 1/2, or all array segments
• Features a hold pin to suspend transmission without resetting the serial sequence

Memory IC Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration data logging
• Device identification storage

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required package type, temperature range, and lead-free status. Confirm compatibility with the target system's SPI voltage levels and clock speed requirements. Ensure the selected variant meets the necessary automotive or industrial qualification standards if applicable to the end application.

Memory IC Selection Notes

Select this component for applications requiring non-volatile memory with simple serial interface connectivity. Consider the 25AA640A over the 25LC640A if operation below 2.5V is required, as the latter has a minimum voltage of 2.5V. Evaluate the need for hardware write protection features when designing the circuit layout and control logic.

Memory IC Part Context

This part belongs to the 25XX640A family of 64-Kbit SPI EEPROMs from Microchip Technology. The 'I' suffix indicates an industrial temperature range of -40°C to +85°C. The 'SN' suffix designates the 8-lead SOIC package. This series is designed for direct interfacing with popular microcontroller families supporting standard SPI protocols.

Memory IC Replacement Considerations

The 25LC640A is a compatible alternative within the same datasheet but requires a supply voltage of 2.5V to 5.5V. Other packages in the 25AA640A family, such as TSSOP or MSOP, offer different form factors while maintaining identical electrical characteristics.