The XT9S20ANA16M is a nonvolatile, non-rewriteable, bipolar EEPROM memory module manufactured by Vishay. It is composed of a 6-pin SOIC (Small Outline Integrated Circuit) package, and is capable of storing 20K bits of nonvolatile data. The memory is organized as 1K x 16 bits (20K bits) and is accessed with a 2-wire serial interface. It offers low power consumption and many flexible features, such as an operating voltage range of 1.8V to 5.5V, an operating temperature range of -40°C to +85°C, and a maximum write time of 5ms. The XT9S20ANA16M also features a write protect pin by which the user can restrict write operations from the external pins.