The Microchip Technology Inc. 25AA640/25LC640 (25XX640*) is a 64 Kbit Serial Electrically Erasable PROM [EEPROM]. The memory is accessed via a simple Serial Peripheral Interface (SPI) compatible serial bus. The bus signals required are a clock input (SCK) plus separate data in (SI) and data out (SO) lines. Access to the device is controlled through a Chip Select (CS) input.

Please consider this device 25LC640A

• Low-power CMOS technology
• 32 byte page
• Self-timed erase and write cycles
• Block write protection
• Built-in write protection
• Sequential read
• High reliability
• Temperature ranges supported: - Industrial (I): -40°C to +85°C - Automotive (E): -40°C to +125°C