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參數(shù)資料
| 型號(hào)： | IMISC661BAB |
| 元件分類(lèi)： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PQFP52 |
| 文件頁(yè)數(shù)： | 4/5頁(yè) |
| 文件大?。?/td> | 287K |
| 代理商： | IMISC661BAB |
SC661
Clock Generator for 3 DIMM, USB and 2.5V Pentium
Design
Approved Product
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev.1.7
5/19/98
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Page 4 of 5
PCB LAYOUT SUGGESTION
NOTES
1.
POWER SUPPLY BYPASS CAPS (O.1UF) MUST BE POSITIONED AS CLOSE AS POSSIBLE TO VDD PINS TO BE EFFECTIVE.
2.
BYPASS CAPS MUST BE LOW LEAKAGE SUCH AS MULTILAYER CERAMIC Z5U OR X7R MATERIAL WHICH ALSO RESULTS IN LOWER
IMPEDANCE AT HIGH FREQUENCY.
3.
FB: FERRITE BEAD
IMISC661
This is only a layout suggestion for best performance and lower EMI. The designer may choose a differnent approach such as
using VDD traces instead of islands (dashed areas). Also, the designer may choose to use less than three beads. Regardless of
which way the layout is implemented, Bypass caps : C3, C4, C5, C6, C7, C8, C9, C10, C11 and C15 (all 0.1
F) should always be
used and placed as close to their VDD pins as possible.
Via to GND plane
Via to VDD island
Via to VCC plane
C8
1
2
3
4
5
6
7
8
9
10
11
12
13
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
40
41
42
43
44
45
46
47
48
49
50
51
52
C3
C11
C10
C4
C5
C9
C6
C7
FB2
VCC
C12 (10
f)
C14 (10
f)
C13 (10
f)
FB1
VCC
FB3
C15
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