The SCL input is used to positive edge clock data into eachEEPROM device and negative edge clock data out of each device.
SERIAL DATA (SDA): The SDA pin is bi-directional for serial data transfer. This pin isopen-drain driven and may be wire-ORed with any number of other open-drain or open-collector devices.
DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2, A1 and A0 pins are deviceaddress inputs that are hard wired for the AT24C01A and the AT24C02.
As many aseight 1K/2K devices may be addressed on a single bus system (device addressing isdiscussed in detail under the Device Addressing section).The AT24C04 uses the A2 and A1 inputs for hard wire addressing and a total of four 4Kdevices may be addressed on a single bus system. The A0 pin is a no connect.
The AT24C08 only uses the A2 input for hardwire addressing and a total of two 8Kdevices may be addressed on a single bus system.
The A0 and A1 pins are noconnects.The AT24C16 does not use the device address pins, which limits the number of deviceson a single bus to one. The A0, A1 and A2 pins are no connects.
