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参数资料
| 型号： | CY2280 |
| 厂商： | Cypress Semiconductor Corp. |
| 英文描述： | 100-MHz Pentium II Clock Synthesizer/Driver with Spread Spectrum for Mobile or Desktop PCs |
| 中文描述： | 100兆赫奔腾II时钟合成器/有蔓延的移动或台式电脑驱动谱 |
| 文件页数： | 9/12页 |
| 文件大小： | 152K |
| 代理商： | CY2280 |
CY2280
Document #: 38-07207 Rev. *A
Page 9 of 12
Application Information
Clock traces must be terminated with either series or parallel termination, as is normally done.
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 Rtrace is the loaded characteristic imped-
ance of the trace, Rout is the output impedance of the clock generator (specified in the data sheet), and Rseries is the series
terminating resistor.
Rseries > Rtrace
–
Rout
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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| CY22800 | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:Universal Programmable Clock Generator (UPCG) |
| CY22800_07 | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:Universal Programmable Clock Generator (UPCG) |
| CY22800-001A | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:Universal Programmable Clock Generator (UPCG) |
| CY22800-002A | 制造商:CYPRESS 制造商全称:Cypress Semiconductor 功能描述:Universal Programmable Clock Generator (UPCG) |
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