Synchronous DRAM is designed to process data at the same speed as clock of CPU. Therefore, synchronous DRAM is regarded as the core component that is advantageous for high speed processing of large volume data. Currently, its usage is expanding to various consumer electronics such as DTV, DSC, HDD and STB.
DDR SDRAM or double-data-rate synchronous dynamic random access memory is a type of memory integrated circuit used in computers and consumer electronics. It achieves greater bandwidth than the preceding single-data-rate SDRAM by transferring data on both the rising and falling edges of the clock signal.

DDR SDRAM

64Mb DDR

Part Number	Organization		Speed Grade			Voltage	Package	Datasheet
W9464G6IH	4Mx16	4 Banks	-4	250 MHz	CL3/CL4	2.5 V	TSOP II 66-pin (400 mil), Green
			-5	200 MHz	CL3
			-6	166 MHz	CL2.5
			-75	133 MHz	CL2
W9464G6BH	4Mx16	4 Banks	-5	200 MHz	CL3	2.5 V	TSOP II 66-pin (400 mil), Green
			-6	166 MHz	CL2.5/CL3
			-75	133 MHz	CL2/CL2.5

128Mb DDR

Part Number	Organization		Speed Grade			Voltage	Package	Datasheet
W9412G6CH	8Mx16	4 Banks	-45	222 MHz	CL3	2.6 V	TSOP II 66-pin (400 mil), Green
			-5	200 MHz
			-6	166 MHz	CL2.5	2.5 V
			-75	133 MHz	CL2
W9412G2CB	4Mx32	4 Banks	-5/-5H	200 MHz	CL3	2.5 V	144 ball LFBGA, Green
			-6	166 MHz	CL2.5
			-75	133 MHz	CL2
W9412G6IH	8Mx16	4 Banks	-4	250 MHz	CL3/CL4	2.5 V	TSOP II 66-pin (400 mil), Green
			-5	200 MHz	CL3
			-6	166 MHz	CL2.5
			-75	133 MHz	CL2

256Mb DDR

Part Number	Organization		Speed Grade			Voltage	Package
W9425G6DH	16Mx16	4 Banks	-4	250 MHz	CL3	2.6 V	TSOP II 66-pin (400 mil), Green
			-5	200 MHz
			-6/-6I	166 MHz	CL2.5	2.5 V
			-75/-75I	133 MHz	CL2
W9425G8DH	32Mx8	4 Banks	-5	200 MHz	CL3	2.6 V	TSOP II 66-pin (400 mil), Green
			-6	166 MHz	CL2.5	2.5 V
			-75	133 MHz	CL2
W9425G6EH	16Mx16	4 Banks	-4	250 MHz	CL3	2.5 V	TSOP II 66-pin (400 mil), Green
			-5	200 MHz
			-6	166 MHz	CL2.5
			-75	133 MHz	CL2