DESCRIPTION

The WED3EG7218S is a 16Mx72 Double Data Rate SDRAM memory module based on 128Mb DDR SDRAM component. The module consists of nine 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.

FEATURES

■ Double-data-rate architecture

■ DDR200, DDR266, DDR333 and DDR400

• JEDEC design specified

■ 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:

• VCC = VCCQ = 2.5V±0.2V (100, 133 and 166MHz)

• VCC = VCCQ = 2.6V±0.1V (200MHz)

■ JEDEC 184 pin DIMM package

• JD3 PCB height: 30.48 (1.20) Max