25AA640-I/SN

Memory IC Overview

The Microchip Technology 25AA640-I/SN is a 64 Kbit Serial Electrically Erasable PROM featuring an SPI-compatible serial bus interface. It utilizes low-power CMOS technology with a supply voltage range of 1.8V to 5.5V and supports clock frequencies up to 1 MHz. The device offers 8192 x 8 bit organization, self-timed erase and write cycles with a maximum duration of 5 ms, and block write protection capabilities. It operates within an industrial temperature range of -40°C to +85°C and is housed in an 8-pin SOIC package.

Memory IC Feature Summary

• Supports sequential read operations with automatic address pointer incrementation
• Includes built-in power on/off data protection circuitry and a write enable latch
• Provides hardware write protection via the WP pin combined with STATUS register configuration

Memory IC Applications

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

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm that the component meets RoHS compliance standards for the intended market. Ensure the design accounts for the recommended operating conditions specified in the datasheet electrical characteristics table.

Memory IC Selection Notes

Select this part when a non-volatile memory solution requires simple SPI communication without complex controller overhead. Consider the 1 MHz maximum clock frequency limitation at lower supply voltages. Evaluate the page write size constraints against application data throughput requirements.

Memory IC Part Context

This component belongs to the 25XX640 family of serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25LC640 but differs in minimum operating voltage specifications. The device is designed for direct interfacing with popular microcontroller families supporting standard SPI protocols.

Memory IC Replacement Considerations

Datasheet explicitly recommends using the 25AA640A or 25LC640A instead of this version for new designs.