Double Data Rate (DDR SDRAM) Integrated Circuits

A class memory of integrated circuits that are used in computers called as Double-data-rate synchronous random access memory (DDR SDRAM). This achieves twice the amount of bandwidth compared to the single data rate (SDR). Now for the technical significance, the transfer rate is at 64 bits at a time split up as 1 memory bus clock rate x 2 dual rate x 64 number of bits transferred / 8 bytes. So when the bus frequency is about 100 MHz, a maximum transfer rate of 1600 MB/s can be achieved.  
The chips and modules of this has been sub divided and set accordingly DDR-200 with a cycle time of 10 nano sec (ns) with about 200 million data transferred/s and 1600 MB/s    peak transfer rate, DDR-266 with 7.5 ns, 266 million and 2100MB/s transfer rate, DDR-400 with 5 ns, 400 million data and with 3200 MB/s peak transfer rate. All the modules, package sizes and things concerning DDR are standardized by JEDEC (Joint Electronic Device Engineering Council).  
New chipsets use these types and are twice to four times the original bandwidth efficiencies. The chips and modules have different types of characteristics the DRAM density and DRAM organization comes under the chip characters and the capacity, DRAM ranks, timings, buffering, packaging and power consumption are for the modules. There are also mobile DDR that are in use for portable electronic devices. The DDR varies with its densities, high and low. The former used for 10% of pc motherboards and the latter DDR SDRAM used for all pc desktop computers.

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