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參數(shù)資料
| 型號(hào)： | CY2277APAC-1M |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類(lèi)： | XO, clock |
| 英文描述： | 6x86, K6 Clock Synthesizer/Driver for Desktop Mobile PCs with Intel 82430TX and 2 DIMMs or 3 SO-DIMMs |
| 中文描述： | 66.67 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | 6 X 12 MM, TSSOP2-48 |
| 文件頁(yè)數(shù)： | 16/19頁(yè) |
| 文件大小： | 206K |
| 代理商： | CY2277APAC-1M |
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CY2277A
Document #: 38-07332 Rev. *A
Page 16 of 19
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 can 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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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| CY2277APAC4 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Interface IC |
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| CY2277APVC-12 | 制造商:Cypress Semiconductor 功能描述: |
| CY2277APVC-12T | 制造商:Cypress Semiconductor 功能描述: |
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