The 25LC640-E/SN is an 8-Kbit Serial EEPROM memory device manufactured by Microchip Technology. It is organized as 512 x 8 bits and operates using a 2-wire Serial Peripheral Interface (SPI) bus. It features a self-timed write cycle for up to 64 bytes of data, hardware write- protection, and an 8-byte Page Write buffer. It is available in a 6-pin PDIP or 8-pin SOIC package and is ideal for low density applications requiring non-volatile memory. It is specified for operation over the temperature range of -40°C to +85°C. This part is also RoHS compliant.