DDR2 SDRAM is very similar to DDR SDRAM, but doubles the minimum read or write unit again, to 4 consecutive words. The bus protocol was also simplified to allow higher performance operation. Also, an extra bank address pin (BA2) was added to allow 8 banks on large RAM chips.
Typical DDR2 SDRAM clock rates are 200, 266, 333 or 400 MHz (periods of 5, 3.75, 3 and 2.5 ns), generally described as DDR2-400, DDR2-533, DDR2-667 and DDR2-800 (periods of 2.5, 1.875, 1.5 and 1.25 ns). Corresponding 240-pin DIMMS are known as PC2-3200 through PC2-6400. DDR2 SDRAM is now available at a clock rate of 533 MHz generally described as DDR2-1066 and the corresponding DIMMs are known as PC2-8500 (also named PC2-8600
Etron Technology, Inc. (Taiwan GTSM: 5351) is a world-class fabless IC design and product company founded in February 1991, specializing in buffer memory and system-on-chips. As a leading manufacturer of buffer memories, Etron offers cutting-edge Known-Good-Die-Memory (KGDM) and Consumer Electronic DRAM (CEDRAM). Etron's full line of Buffer DRAM chips - available in densities ranging from 8Mb to 1Gb - is designed to ensure high processing speeds and low-power consumption for Consumer, Communication, Computer, and Car ( 4C ) applications. Moreover, Etron has developed many advanced system-on-chip (SOC) IC products, including USB3.0 host controller ICs, USB3.0 flash drive controller ICs, and 3D imaging and gesture-sensing integrated webcam controller ICs.
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Etron Technology, Inc. (Taiwan GTSM: 5351) is a world-class fabless IC design and product company founded in February 1991, specializing in buffer memory and system-on-chips. As a leading manufacturer of buffer memories, Etron offers cutting-edge Known-Good-Die-Memory (KGDM) and Consumer Electronic DRAM (CEDRAM). Etron's full line of Buffer DRAM chips - available in densities ranging from 8Mb to 1Gb - is designed to ensure high processing speeds and low-power consumption for Consumer, Communication, Computer, and Car ( 4C ) applications. Moreover, Etron has developed many advanced system-on-chip (SOC) IC products, including USB3.0 host controller ICs, USB3.0 flash drive controller ICs, and 3D imaging and gesture-sensing integrated webcam controller ICs.