The Fujitsu MB81N643289 is a CMOS Fast Cycle Random Access Memory (FCRAM) containing 67,108,864 memory cells accessible in an 32-bit format. The MB81N643289 features a fully synchronous operation referenced to clock edge whereby all operations are synchronized at a clock input which enables high performance and simple user interface coexistence. The MB81N643289 is designed to reduce the complexity of using a standard dynamic RAM (DRAM) which requires many control signal timing constraints. The MB81N643289 uses Double Data Rate (DDR) where data bandwidth is twice of fast speed compared with regular SDRAMs. The MB81N643289 is designed using Fujitsu advanced FCRAM Core Technology. The MB81N643289 is ideally suited for Digital Visual System, High Performance Graphic Adapters, Hardware Accelerators, Buffers, and other applications where large memory density and high effective bandwidth are required and where a simple interface is needed. The MB81N643289 adopts new I/O interface circuitry, 2.5 V CMOS Source Termination I/O interface, which is capable of extremely fast data transfer of quality under point to point bus environment.