ATMEL Two-wire Serial EEPROM 2K (256 x 8) 4K (512 x 8) AT24C02A AT24C04A handbook
Datasheet
AT24C02A/04A is a serial electrically erasable and programmable read-only memory (EEPROM) with low-power and low-voltage operation. The device is organized as 256/512 words of 8 bits each and is optimized for use in many industrial and commercial applications.