Additional EEPROM devices can be added to the bus but they must have a different chip-select and address pin combinations. To show this, A0 is now connected to Vcc. Note that the chip select bits have also changed to 001 to match the address pins. Some devices have pins that are not internally connected. This information can be found on the datasheet of the particular device. Also, some applications use a MCU to drive address pins high or low. Be sure that the inputs are driven to a 1 or 0 before commencing operations.