16M x 8 Banks x 8 Bits DDR2 SDRAM

Manufacturer's part number :


Manufacturer Winbond


Description :

The W971GG8JB is a 1G bits DDR2 SDRAM, organized as 16,777,216 words x 8 banks x 8 bits. This device achieves high speed transfer rates up to 1066Mb/sec/pin (DDR2-1066) for general applications. W971GG8JB is sorted into the following speed grades: -18, -25, 25I and -3. The -18 is compliant to the DDR2-1066 (6-6-6) specification. The -25/25I are compliant to the DDR2-800 (5-5-5) specification (the 25I industrial grade which is guaranteed to support -40°C ≤ TCASE ≤ 95°C). The -3 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 NOT CLK falling). All I/Os are synchronized with a single ended DQS or differential DQS- NOT DQS pair in a source synchronous fashion.

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  • Power Supply: VDD, VDDQ = 1.8 V ± 0.1 V
  • Double Data Rate architecture: two data transfers per clock cycle
  • CAS Latency: 3, 4, 5, 6 and 7
  • Burst Length: 4 and 8
  • Bi-directional, differential data strobes (DQS and NOT DQS ) are transmitted / received with data
  • Edge-aligned with Read data and center-aligned with Write data
  • DLL aligns DQ and DQS transitions with clock
  • Differential clock inputs (CLK and NOT CLK )
  • Data masks (DM) for write data.
  • Commands entered on each positive CLK edge, data and data mask are referenced to both edges of DQS
  • Posted NOT CAS programmable additive latency supported to make command and data bus efficiency
  • Read Latency = Additive Latency plus CAS Latency (RL = AL + CL)
  • Off-Chip-Driver impedance adjustment (OCD) and On-Die-Termination (ODT) for better signal quality
  • Auto-precharge operation for read and write bursts
  • Auto Refresh and Self Refresh modes
  • Precharged Power Down and Active Power Down
  • Write Data Mask
  • Write Latency = Read Latency - 1 (WL = RL - 1)
  • Interface: SSTL_18
  • Packaged in WBGA 60 Ball (8x12.5 mm²), using Lead free materials with RoHS compliant
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Organisation x8  
Speed 400 MHz  
Voltage 1.8 V  
Package WBGA-60