A family of serial EEPROMs features a pre-programmed 32-bit serial number for applications requiring unique IDs. The family of 2-Kb EEPROM devices from Microchip Technology Inc. allows users to scale the unique ID to 48-, 64-, 96-, 128-bit, and other lengths by increasing the number of bytes read from memory. The devices are available in standard buses, such as I2C, SPI, and Microwire, and include up to 1.5 Kb of memory that can be used as a standard EEPROM.
Microchip also has released a 256-Kb I2C unique-ID device that contains IEEE EUI-48 and IEEE EUI-64 MAC addresses, in addition to the 32-bit serial number. The IDs are in a write-protected area of the memory, giving users up to 224 Kb of EEPROM for other applications. Additionally, the company augmented its existing EUI-48 MAC Address portfolio with pre-programmed EUI-64 MAC addresses. Available in the I2C,SPI, and UNI/O bus, the 2-Kb EEPROM devices feature up to 1.5 Kb of EEPROM that can be used for storing configuration settings or as an area for buffering small amounts of data.
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