W255 Datasheet, PDF(7/10 Page) SpectraLinear Inc – 200 MHz 24-Output Buffer for 4 DDR or 3 SDRAM DIMMS

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W255 Datasheet, PDF (7/10 Pages) SpectraLinear Inc – 200 MHz 24-Output Buffer for 4 DDR or 3 SDRAM DIMMS

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Layout Example for DDR 2.5V Only

+2.5V Supply

VDDQ2

0.005 mF 10 mF

V 47

G 46

G 42

V 41

G 40

11 G

12 V

13 G

G 38

V 37

G 36

G 35

16 G

17 V

18 G

G 33

V 32

G 31

22 G

23 V

24 G

G 26

FB = Dale ILB1206 - 300 (300â¦ @ 100 MHz) or TDK ACB 2012L-120

Ceramic Caps C3 = 10â22 ÂµF

C4 = 0.005 ÂµF

G = VIA to GND plane layer V = VIA to respective supply plane layer

Note: Each supply plane or strip should have a ferrite bead and capacitors

All bypass caps = 0.1 ÂµF ceramic

W255

Document #: 38-07255 Rev. *D

Page 7 of 10

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