W255H Datasheet Download

Part No.:
W255H
Download:
Download Datasheet
Description:
[200-MHz 24-Output Buffer for 4 DDR or 3 SDRAM DIMMS]
File Size:
256 K
Page:
10 Pages
Logo:
Manufacturer:
CYPRESS [ CYPRESS SEMICONDUCTOR ]
PCB Prototype
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W255
Layout Example for DDR 2.5V Only
+2.5V Supply
FB
VDDQ2
C4
0.005 mF
10 mF
C3
G
G
G
G
G
G
G
1
G
2
V
3
G
4
5
6
7
G
8
V
9
G
10
11
G
12
V
G
13
14
15
16
G
17
V
18
G
19
20
21
22
G
23
V
24
G
G
48
V
47
G
46
45
44
43
G
42
V
41
G
40
39
G
38
V
37
G
36
G
35
34
G
33
V
32
G
31
30
29
28
27
G
26
25
G
G
FB = Dale ILB1206 - 300 (300Ω @ 100 MHz) or TDK ACB 2012L-120
Ceramic Caps C3 = 10–22
µF
G = VIA to GND plane layer
C4 = 0.005
µF
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
µF
ceramic
W255
G
G
Document #: 38-07255 Rev. *D
Page 7 of 10