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參數(shù)資料
| 型號： | C9851BT |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | TSSOP-48 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 131K |
| 代理商： | C9851BT |
+/+
…when timing is critical
C9851
Clock Generator for Pentium
III Server and Workstation Applications
Preliminary
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
1.0
2/1/2000
MILPITAS, CA TEL 408-263-6300, FAX 408-263-6571
Page 6 of 13
http://www.imicorp.com
Lumped Test Load Configurations (Cont.)
Fig. 1B
Spread Spectrum Clock Generation (SSCG)
Spread Spectrum is a modulation technique applied here for maximum efficiency in minimizing Electro-Magnetic
Interference radiation generated from repetitive digital signals mainly clocks. A clock accumulates EM energy at the
center frequency it is generating. Spread Spectrum distributes this energy over a small frequency bandwidth therefore
spreading the same amount of energy over a spectrum. This technique is achieved by modulating the clock down from
(Fig.6) its resting frequency by a certain percentage (which also determines the energy distribution bandwidth). The
default of the device at power up keeps the Spread Spectrum disabled, therefore, in ordr to enable this function pin23,
Spread#, must be connect to ground (a low state.). See table 4 for Spread bandwidth description.
In Down Spread mode the center frequency is shifted down from its rested (non-spread) value by -0.25%.
(ex.:
assuming the center frequency is 100MHz in non-spread mode; when down spread is enabled, the center frequency
shifts to 99.75MHz.).
In Center Spread mode, the Center frequency remains the same as in the non-spread mode.
Probe
Output under Test
Load Cap
2.4V
0.4V
3.3V
0V
Tr
Tf
1.5V
3.3V signals
tDC
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| C9870G | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:High Performance Pentium? 4 Clock Synthesizer |
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| C9870GY | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:High Performance Pentium? 4 Clock Synthesizer |
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