The Microchip AT21CS11 is a 1 Kb Serial EEPROM utilizing the Single-Wire bus. Only two pins are needed to access the device: SI/O and GND. The SI/O signal is a combination data and power line, providing power to the device with a parasitic power scheme. The device is organized as one block of 128 x 8 and is optimized for use in consumer and industrial applications where reliable and dependable nonvolatile memory storage is essential.

128 x 8 (1 Kbit)
Single-Wire Compatible
I²C Protocol Structure
Communication through a single I/O pin
High Speed (125 kbps) Mode
Self-Timed Erase and Write Cycles (5 ms max.)
Low Power Consumption
Software Write Protection
Four independent 256-bit zones
More than 1 million erase/write cycles