AT24MAC402/602 I2C Compatible Series EEPROMs

Microchip AT24MAC402/602 I2C Compatible Series EEPROMs provide 2048 bits of Serial Electrically-Erasable Programmable Read-Only Memory (EEPROM) organized as 256 words of eight bits each and is accessed via an I2C-compatible (2-wire) serial interface. In addition, AT24MAC402/602 incorporates an easy and inexpensive method to obtain a globally unique MAC or EUI address (EUI-48 or EUI-64). AT24MAC402 is an EUI-48 compatible device with a 48-bit EUI address, and AT24MAC602 is an EUI-64 compatible device with a 64-bit EUI address. The EUI-48 and EUI-64 addresses can be assigned as the actual physical address of a system hardware device or node, or they can be assigned to a software instance. These addresses are factory programmed by Microchip and permanently write-protected in an extended memory block outside the standard 2-Kbit bit memory array. In addition, the AT24MAC402/602 provides the value-added feature of a factory-programmed, guaranteed unique 128-bit serial number located in the extended memory block (same area as the EUI address values). The serial number is Microchip factory-programmed and permanently write-protected. This 128-bit serial number is compatible with all AT24CS, AT93CS, and AT25S family serial numbers, providing guaranteed unique serial numbers for any application that uses Microchip Serial EEPROMs.