The AT21CS11-STU10-T is a 1-Kbit (128 x 8) single-wire serial EEPROM that is powered via its I/O line. It operates with a pull-up voltage range of 2.7V to 4.5V and communicates using a single I/O pin with an I2C-like protocol at up to 125 kbps in High-Speed mode. The device features a factory-programmed, read-only 64-bit unique serial number stored within a 256-bit security register. It supports 8-byte page writes and is rated for the industrial temperature range of -40°C to +85°C. This EEPROM is ideal for adding configuration data to unpowered attachments like sensor modules, printer cartridges, or other consumables.