GENERAL DESCRIPTION
The W971GG6SB is a 1G bits DDR2 SDRAM, organized as 8,388,608 words ï´ 8 banks ï´ 16 bits. This device achieves high speed transfer rates up to 1066Mb/sec/pin (DDR2-1066) for various applications. W971GG6SB is sorted into the following grade parts: -18, 18I, -25, 25I and -3. The -18 and 18I grade parts are compliant to the DDR2-1066 (6-6-6) specification (the 18I industrial grade which is guaranteed to support -40°C ⤠TCASE ⤠95°C). The -25 and 25I grade parts are compliant to the DDR2-800 (5-5-5) or DDR2-800 (6-6-6) specification (the 25I industrial grade which is guaranteed to support -40°C ⤠TCASE ⤠95°C). The -3 grade parts is compliant to the DDR2-667 (5-5-5) specification.
All of the control and address inputs are synchronized with a pair of externally supplied differential clocks. Inputs are latched at the cross point of differential clocks (CLK rising and CLK falling). All I/Os are synchronized with a single ended DQS or differential DQS- DQS pair in a source synchronous fashion.
FEATURES
â Power Supply: VDD, VDDQ = 1.8 V ± 0.1 V
â Double Data Rate architecture: two data transfers per clock cycle
â CAS Latency: 3, 4, 5, 6 and 7
â Burst Length: 4 and 8
â Bi-directional, differential data strobes (DQS and DQS ) are transmitted / received with data
â Edge-aligned with Read data and center-aligned with Write data
â DLL aligns DQ and DQS transitions with clock
â Differential clock inputs (CLK and CLK )
â Data masks (DM) for write data
â Commands entered on each positive CLK edge, data and data mask are referenced to
both edges of DQS
â Posted CAS programmable additive latency supported to make command and
data bus efficiency
â Read Latency = Additive Latency plus CAS Latency (RL = AL + CL)
â Off-Chip-Driver impedance adjustment (OCD) and On-Die-Termination (ODT) for
better signal quality
â Auto-precharge operation for read and write bursts
â Auto Refresh and Self Refresh modes
â Precharged Power Down and Active Power Down
â Write Data Mask
â Write Latency = Read Latency - 1 (WL = RL - 1)
â Interface: SSTL_18
â Packaged in WBGA 84 Ball (8x12.5 mm2), using Lead free materials with RoHS compliant
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