APPROVED PRODUCT
C9777
Low EMI Clock Generator for 440BX, ALi1631 & Via Pro133+ / Pentium®III Systems
PCB Layout Suggestion
Via to VDD Island
Via to GND plane
C9777
VCC3.3V
Via to VCC plane
FB1
+
1
2
3
4
5
6
7
8
9
48
47
46
45
44
43
C34
VCC2.5V
22µF
FB2
42
41
C5
+
40
39
38
10
11
22µF
12
13
14
15
16
37
36
35
34
33
32
17
18
31
30
19
29
20
21
22
23
28
27
VCC3.3V
26
25
FB3
+
24
C42
22µF
This is only a layout recommendation for best performance and lower EMI. The designer may choose a different approach
but C3, C4, C5, C35, C36, C37, C38, C39, C40 and C41 (all are 0.1µf) should always be used and placed as close as
possible to their VDD pins.
Cypress Semiconductor Corporation
525 Los Coches St.
Document#: 38-07048 Rev. **
05/02/2001
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
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