Double Data Rate 2 (DDR2) SDRAM

Intelligent Memory Double Data Rate (DDR2) Synchronous DRAM (SDRAM) are eight-bank devices that achieve high-speed data transfer rates. Interleaving the eight memory banks allows random access operations faster than standard DRAMs. A chip architecture prefetches multiple bits and then synchronizes the output data to a system clock. All control, address, and circuits are synchronized with the positive edge of an externally supplied clock. In a source-synchronous manner, I/Os are synchronized with a pair of bidirectional strobes. A sequential, gapless data rate is possible depending on the device's burst length, CAS latency, and speed grade.