The EDD5104AD, the EDD5108AD and the EDD5116AD are 512M bits Double Data Rate (DDR) SDRAM. Read and write operations are performed at the cross points of the CK and the /CK. This highspeed data transfer is realized by the 2 bits prefetchpipelined architecture. Data strobe (DQS) both for read and write are available for high speed and reliable data bus design. By setting extended mode register, the on-chip Delay Locked Loop (DLL) can be set enable or disable. It is packaged in standard 66-pin plastic TSOP (II).