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This type of SDRAM is slower than the DDR variants, because only one word of data is transmitted per clock cycle (single data rate). But this type is also faster than its predecessors EDO-RAM and FPM-RAM which took typically 2 or 3 clocks to transfer one word of data.

Density	Org.	Part No.	VDD.	Speed	Package	Download
64M?	4M x 16?	CS56SD64	3.3V?	166 / 143Mhz?	54Pin TSOP-II (400mil) ?	NULL
128M?	8M x 16?	CS56SD128	3.3V?	166 / 143Mhz?	54Pin TSOP-II (400mil) ?	NULL
256M?	16M x 16?	CS56SD256	3.3V?	166 / 143Mhz?	54Pin TSOP-II (400mil) ?	NULL
512M?	32M x 16?	CS56SD512	2.7~3.6V?	166 / 143Mhz?	54Pin TSOP-II (400mil)?	NULL
512M?	32M x 16?	CS56SD512	2.7~3.6V ?	166 / 143Mhz ?	54ball TFBGA-8mm x 8mm x 1.0mm?	NULL

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