The 25LC256-E/P is a 256Kbit (32K x 8) SPI serial EEPROM manufactured by Microchip Technology. It is supported by the industry-standard Serial Peripheral Interface (SPI) protocol, which uses several pins (which can be found on a 26-pin SSOP package) for data transmission. It has a typical cycle time of 5µs for each byte read or written, and can operate over a range of temperatures from -40°C to +85°C. The 25LC256-E/P offers an array of advanced features including: low power consumption, advanced write protection, priority write protection, sequential read/write operations and lockable device. The 25LC256-E/P also offers high-reliability erase and write operations up to 10 years data retention, and 20000 full-write cycles.