W9425G6DH 查看數據表（PDF） - Winbond

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W9425G6DH

4M × 4 BANKS × 16 BITS DDR SDRAM

Winbond 

W9425G6DH

1. GENERAL DESCRIPTION

W9425G6DH is a CMOS Double Data Rate synchronous dynamic random access memory (DDR

SDRAM), organized as 4,194,304 words × 4 banks × 16 bits. Using pipelined architecture and 0.11 µm

process technology, W9425G6DH delivers a data bandwidth of up to 500M words per second (-4). To

fully comply with the personal computer industrial standard, W9425G6DH is sorted into four speed

grades: -4, -5, -6 and -75. The -4 is compliant to the DDR500/CL3 specification. The -5 is compliant to

the DDR400/CL3 specification. The -6 is compliant to the DDR333/CL2.5 specification (the -6I grade

which is guaranteed to support -40°C ~ 85°C). The -75 is compliant to the DDR266/CL2 specification

(the 75I grade which is guaranteed to support -40°C ~ 85°C).

All Input reference to the positive edge of CLK (except for DQ, DM and CKE). The timing reference

point for the differential clock is when the CLK and CLK signals cross during a transition. Write and

Read data are synschronized with the both edges of DQS (Data Strobe).

By having a programmable Mode Register, the system can change burst length, latency cycle,

interleave or sequential burst to maximize its performance. W9425G6DH is ideal for main memory in

high performance applications.

2. FEATURES

• 2.5V ±0.2V Power Supply for DDR266/DDR333

• 2.6V ±0.1V Power Supply for DDR400/DDR500

• Up to 250 MHz Clock Frequency

• Double Data Rate architecture; two data transfers per clock cycle

• Differential clock inputs (CLK and CLK )

• DQS is edge-aligned with data for Read; center-aligned with data for Write

• CAS Latency: 2, 2.5 and 3

• Burst Length: 2, 4 and 8

• Auto Refresh and Self Refresh

• Precharged Power Down and Active Power Down

• Write Data Mask

• Write Latency = 1

• 7.8µS refresh interval (8K / 64 mS refresh)

• Maximum burst refresh cycle: 8

• Interface: SSTL_2

• Packaged in TSOP II 66-pin, 400 mil, 0.65 mm pin pitch, using Pb free with RoHS compliant

Publication Release Date:Nov. 20, 2007

-4-

Revision A7

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