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參數(shù)資料
| 型號： | CY2267 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Pentium Pro, and Cyrix 6x86 Compatible Clock Synthesizer/Driver(奔騰和 Cyrix公司 6x86兼容的時鐘合成器/驅動器) |
| 中文描述： | 奔騰Pro和Cyrix 6x86兼容的時鐘合成器/驅動器（奔騰和Cyrix公司6x86兼容的時鐘合成器/驅動器） |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 104K |
| 代理商： | CY2267 |
CY2267
7
Application Information
Clock traces must be terminated with either series or parallel termination, as they are normally done.
The Application Circuit is shown below.
Application Circuit
Summary
A parallel-resonant crystal should be used as the reference to the clock generator. The operating frequency and C
of
this crystal should be as specified in the data sheet. Optional trimming capacitors may be needed if a crystal with a different
C
LOAD
is used. Footprints must be laid out for flexibility.
Surface mount, low-ESR, ceramic capacitors should be used for filtering. Typically, these capacitors have a value of 0.1
μ
F.
In some cases, smaller value capacitors may be required.
The value of the series terminating resistor satisfies the following equation, where R
is the loaded characteristic impedance
of the trace, R
out
is the output impedance of the clock generator (specified in the data sheet), and R
series
is the series terminating
resistor.
R
series
> R
trace
– R
out
Footprints must be laid out for optional EMI-reducing capacitors, which should be placed as close to the terminating resistor
as is physically possible. Typical values of these capacitors range from 4.7 pF to 22 pF.
A Ferrite Bead
may
be used to isolate the Board V
from the clock generator V
island. Ensure that the Ferrite Bead offers
greater than 50
impedance at the clock frequency, under loaded DC conditions. Please refer to the application note “Layout
and Termination Techniques for Cypress Clock Generators” for more details.
If a Ferrite Bead is used, a 10
μ
F– 22
μ
F tantalum bypass capacitor should be placed close to the Ferrite Bead. This capacitor
prevents power supply droop during current surges.
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| CY2272 | Pentium 6x86, K6 Clock Synthesizer/Driver for Mobile PCs with Intel 82430TX or Ali IV/V+ and 3 SO-DIMMs(帶英特爾82430TX或 Ali IV/V+ 和3個 SO-DIMM的應用于移動PC機的奔騰6x86, K6 時鐘合成器/驅動器) |
| CY2275A | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX with 3 DIMMs(帶英特爾82440LX 和 3個DIMM的應用于桌上型PC機的奔騰II時鐘合成器/驅動器) |
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| CY2276A-21 | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX and 3SO- DIMMs(帶英特爾82440LX 和3SO-DIMM的應用于桌上型PC機的奔騰II時鐘合成器/驅動器) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CY22701 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:1 PLL In-System Programmable Clock Generator |
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| CY22701FSXIT | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:1 PLL In-System Programmable Clock Generator |
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