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

White Electronic Designs

November 2004

Rev. 2

PRELIMINARY*

W3EG7235S-JD3

OPERATING FREQUENCIES

DDR266 @CL=2

DDR266 @CL=2.5

DDR200 @CL=2

Clock Speed

133MHz

133MHz

100MHz

2-2-2

2.5-3-3

2-2-2

256MB – 2x16Mx72 DDR SDRAM REGISTERED ECC, w/PLL

The WED3DG7235S is a 2x16Mx72 Double Data Rate

SDRAM memory module based on 128Mb DDR SDRAM

component. The module consists of eighteen 16Mx8 DDR

SDRAMs in 66 pin TSOP packages 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 Lengths 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.

DESCRIPTION

FEATURES

Double-data-rate architecture

Speeds of 100MHz and 133MHz

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

Dual Rank

Power supply: 2.5V ± 0.20V

JEDEC standard 184 pin DIMM package

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Package height option:

JD3 30.48 mm (1:20")

NOTE: Consult factory for availability of:

• RoHS compliant products

• Vendor source control options

• Industrial temperature option