Standard EEPROM ICs SLx 24C04 4 Kbit (512 × 8 bit.
SLX24C04P - 4 Kbit 512 x 8 bit Serial CMOS EEPROMs/ I2C Synchronous 2-Wire Bus/ Page Protection Mode
SLX24C04 - 4 Kbit 512 x 8 bit Serial CMOS EEPROMs/ I2C Synchronous 2-Wire Bus