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White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com

White Electronic Designs

PRELIMINARY*

White Electronic Designs Corp. reserves the right to change products or specifications without notice.

W3EG6418S-D3

-JD3

May 2005

Rev. 3

128MB – 16Mx64 DDR SDRAM UNBUFFERED

DESCRIPTION

The W3DG6418S is a 16Mx64 Double Data Rate

SDRAM memory module based on 128Mb DDR SDRAM

components. The module consists of eight 16Mx8 DDR

SDRAMs in 66 pin TSOP package mounted on a 184

Pin FR4 substrate.

Synchronous design allows precise cycle control with

the use of system clock. Data I/O transactions are

possible on both edges and Burst Lenths allow the same

device to be useful for a variety of high bandwidth, high

performance memory system applications.

* This product is under development, is not qualified or characterized and is subject

to change without notice.

FEATURES

Double-data-rate architecture

DDR200 and DDR266

• JEDEC design specifications

Bi-directional data strobes (DQS)

Differential clock inputs (CK & CK#)

Programmable Read Latency 2,2,5 (clock)

Programmable Burst Length (2,4,8)

Programmable Burst type (sequential & interleave)

Edge aligned data output, center aligned data input

Auto and self refresh

Serial presence detect

Power Supply: 2.5V ± 0.20V

JEDEC standard 184 pin DIMM package

• JD3 PCB height: 30.48mm (1.20") MAX

NOTE: Consult factory for availability of:

• Lead-free products

• Vendor source control option

• Industrial temperature option

OPERATING FREQUENCIES

DDR266 @CL=2

DDR266 @CL=2

DDR266 @CL=2.5

DDR200 @CL=2

Clock Speed

133MHz

133MHz

133MHz

100MHz

2-2-2

2-3-3

2.5-3-3

2-2-2