The 25AA320X-I/ST part of Microchip is a 32-Kbit serial EEPROM memory device. It is an 8-pin low voltage serial EEPROM device with an SPI-compatible, four-wire serial interface. It has storage capacities of 32-Kbits with the ability of endure more than 1 million write/erase cycles with a data retention period of up to 200 years. It is designed for applications such as PC BIOS, Plug and Play add-in cards, Industrial Control, Data Acquisition, Modem Cards, and Digital Printers. The device features a Low-Voltage Detect (LVD) which switches the I/Os which to protect it from voltage and current transients during power-up. It contains advanced, on board write protection features to prevent inadvertent overwriting of critical data during power transients. The device is available in 8-pin SOIC, 8-lead PDIP, and 8-pin TSSOP packages.