W9725G6KB数据手册集成电路（IC）的存储器规格书PDF

描述 Description

The W9725G6KB is a 256M bits DDR2 SDRAM, and speed involving -18, -25, 25I and -3

特性 Features

•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 /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 /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 /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
• Package:WBGA 84 Ball (8X12.5 mm2), RoHS compliant