HY5R256HCxxx

Direct RDRAM™ 256/288-Mbit (512Kx16/18x32s) Preliminary Overview The Rambus Direct RDRAM™ is a general purpose highperformance memory device suitable for use in a broad range of applications including computer memory, graphics, video, and any other application where high bandwidth and low latency are required. The 256/288-Mbit Direct Rambus DRAMs (RDRAM)are extremely high-speed CMOS DRAMs organized as 16M words by 16 or 18 bits. The use of Rambus Signaling Level (RSL) technology permits 600MHz to 800MHz transfer www.DataSheet4U.com rates while using conventional system and board design technologies. Direct RDRAM devices are capable of sustained data transfers at 1.25 ns per two bytes (10ns per sixteen bytes). The architecture of the Direct RDRAMs allows the highest sustained bandwidth for multiple, simultaneous randomly addressed memory transactions. The separate control and data buses with independent row and column control yield over 95% bus efficiency. The Direct RDRAM's 32 banks support up to four simultaneous transactions. System oriented features for mobile, graphics and large memory systems include power management, byte masking, and x18 organization. The two data bits in the x18 organization are general and can be used for additional storage and bandwidth or for error correction. Figure 1: Direct RDRAM uBGA Package The 256/288-Mbit Direct RDRAMs are offered in a uBGA package suitable for desktop as well as low-profile add-in card and mobile applications. Direct RDRA...