The Microchip Technology Inc. 24AA256UID is a 256 Kbit Electrically Erasable PROM with a pre-programmed globally unique EUI-48? and EUI-64? IEEE MAC address. The device also has a pre-programmed 32-bit unique ID. This serial number is unique across all UID-Family of EEPROMs. The ID is Scalable to 48-bit, 64-bit, 128-bit, 256-bit, and other lengths. The 24AA256UID is a 32K x 8 (256 Kbit) SerialElectrically Erasable PROM, capable of operationacross a broad voltage range (1.8V to 5.5V). It hasbeen developed for advanced, low-power applicationssuch as personal communications or data acquisition.This device also has a page write capability of up to 64bytes of data. This device is capable of both randomand sequential reads up to the 256K boundary. The 24AA256UID device is avaliable in 8-SOIC, 8-PDIP and 8-TSSOP packages.

   Pre-programmed Codes

  Globally Unique 48-bit and 64-bit Node Addresses

  EUI-48? & EUI-64? compatible

  Pre-programmed 32-bit Serial Number (ID)

   Unique Across All UID-Family EEPROMs

   Scalable to 48-bit, 64-bit, 128-bit, 256-bit, and other lengths

  Stored in Permanently Write-ProtectedUpper 1/8th of EEPROM Array

  Reliable EEPROM Memory

  Self-Timed Erase/Write Cycle

  64-Byte Page Write Buffer

  Page Write Time 5 ms Max.

  Low Power

  Operating voltage 1.7V to 5.5V

  Read current 1 mA, max.

  Standby current 1 uA, max.

  2-Wire Serial Interface, I2C? Compatible

  Cascadable up to Eight Devices

  Schmitt Trigger Inputs for Noise Suppression

  Output Slope Control to Eliminate Ground Bounce

  100 kHz and 400 kHz Clock Compatible

  ESD Protection >4000V

  Pb-Free and RoHS Compliant

  Packages Include 8-lead PDIP, SOIC and TSSOP