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參數(shù)資料
| 型號： | CY28159 |
| 英文描述： | Clocks and Buffers |
| 中文描述： | 時鐘和緩沖器 |
| 文件頁數(shù)： | 5/13頁 |
| 文件大?。?/td> | 144K |
| 代理商： | CY28159 |
CY28159
Document #: 38-07118 Rev. *A
Page 5 of 13
Spread Spectrum Clock Generation (SSCG)
Spread Spectrum is a modulation technique applied here for
maximum efficiency in minimizing Electro-Magnetic Interfer-
ence radiation generated from repetitive digital signals mainly
clocks. For a detailed explanation of Spread Spectrum Clock
Generation.
Power Management Functions
Notes:
2.
3.
The entries in boldface are the primary system configurations of interest. The outputs should be optimized for these configurations.
Rr refers to the resistance placed in series with the Iref input and V
SS
.
Table 4. Spectrum Spreading Selection Table
Unspread Frequency in MHz
Spread Spectrum Parameter
Downspreading
F Center(MHz)
99.75
132.67
199.75
F Min(MHz)
99.5
132.66
199.5
F Max(MHz)
100
133
200
Spread (%)
–0.5%
–0.5%
–0.5%
100
133.3
200
Table 5. Host Swing Select Functions
[2]
Multsel0
MultSel1
Board Target
Trace/TermZ
Reference Rr, Iref = Vdd(3*Rr)
Note 3
Rf = 475 1%,
Iref = 2.32 mA
Rr = 475 1%,Iref = 2.32 mA
Rr = 475 1%,Iref = 2.32 mA
Rr = 475 1%,Iref = 2.32 mA
Rr = 475 1%,Iref = 2.32 mA
Rr = 475 1%,Iref = 2.32 mA
Rr = 475 1%,Iref = 2.32 mA
Rr = 475 1%,Iref = 2.32 mA
Output Current
Voh@Z, Iref =
2.32 mA
0
0
60 Ohms
Ioh = 5*Iref
07V@60
0
0
0
1
1
1
1
0
1
1
0
0
1
1
50 Ohms
60 Ohms
50 Ohms
60 Ohms
50 Ohms
60 Ohms
50 Ohms
Ioh = 5*Iref
Ioh = 6*Iref
Ioh = 6*Iref
Ioh = 4*Iref
Ioh = 4*Iref
Ioh = 7*Iref
Ioh = 7*Iref
0.59V @ 50
0.85V @ 60
0.71V @ 50
0.56V @ 60
0.47V @ 50
0.99V @ 60
0.82V @ 50
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相關(guān)代理商/技術(shù)參數(shù) |
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| CY28159PVC | 制造商:Rochester Electronics LLC 功能描述:FTG FOR SERVERWORKS GRAND CHAMPION CHIPSET - Bulk |
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| CY28159ZCT | 制造商:SPECTRALINEAR 制造商全稱:SPECTRALINEAR 功能描述:Clock Generator for Serverworks Grand Champion Chipset Applications |
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