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DDR SDRAM (sometimes called DDR1 for greater clarity) doubles the minimum read or write unit; every access refers to at least two consecutive words.

Typical DDR SDRAM clock rates are 133, 166 and 200 MHz (7.5, 6, and 5 ns/cycle), generally described as DDR-266, DDR-333 and DDR-400 (3.75, 3, and 2.5 ns per beat). Corresponding 184-pin DIMMs are known as PC-2100, PC-2700 and PC-3200. Performance up to DDR-550 (PC-4400) is available for a price.

UniIC
Etron

Xi’an UniIC Semiconductors Co., Ltd.(Xi’an UniIC) was formerly known as Xi’an Sinochip Semiconductors Co., Ltd. which was restructured from Qimonda Technologies (Xi'an) Co., Ltd. in 2009. The company was initially founded in later 2003 as memory product development department of Infineon Technologies (Xi’an) Co., Ltd. After the span off of Qimonda Technologies from Infineon in 2006, it became an own legal entity named Qimonda Technologies (Xi'an) Co., Ltd.

Capacity	Organization	Part Number	Voltage	Package	Speed	Temperature	Download
1Gb	128x8	SCB25D1G800AF	2.5V	PG-TFBGA-60	DDR-266/333/400	-40 ℃ ~ 85 ℃	NULL
1Gb	64x16	SCB25D1G160AE	2.5V	PG-TFBGA-60	DDR-266/333/400	-40 ℃ ~ 85 ℃	NULL
1Gb	128x8	SCB25D1G800AE	2.5V	TSOPII-66	DDR-266/333/400	-40 ℃ ~ 85 ℃	NULL
1Gb	64x16	SCB25D1G160AE	2.5V	TSOPII-66	DDR-266/333/400	-40 ℃ ~ 85 ℃	NULL
1Gb	128x8	SCB25D1G800AE	2.5V	TSOPII-66	DDR-266/333/400	0 ℃~ 70 ℃	NULL
1Gb	64x16	SCB25D1G160AE	2.5V	TSOPII-66	DDR-266/333/400	0 ℃~ 70 ℃	NULL
1Gb	128x8	SCB25D1G160AF	2.5V	PG-TFBGA-60	DDR-266/333/400	0 ℃~ 70 ℃	NULL
1Gb	64x16	SCB25D1G800AF	2.5V	PG-TFBGA-60	DDR-266/333/400	0 ℃~ 70 ℃	NULL

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