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參數(shù)資料
| 型號： | CY2277APVC-12 |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | LJT 37C 37#16 PIN RECP |
| 中文描述： | 66.67 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | SSOP-48 |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 206K |
| 代理商： | CY2277APVC-12 |
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CY2277APVC-3 | LJT 37C 37#16 SKT RECP |
| CY2277APVI-12 | Circular Connector; No. of Contacts:56; Series:MS27656; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
| CY2277A | 6x86, K6 Clock Synthesizer/Driver for Desktop Mobile PCs with Intel 82430TX and 2 DIMMs or 3 SO-DIMMs |
| CY2277APAC-1M | 6x86, K6 Clock Synthesizer/Driver for Desktop Mobile PCs with Intel 82430TX and 2 DIMMs or 3 SO-DIMMs |
| CY2277APAC-7M | 6x86, K6 Clock Synthesizer/Driver for Desktop Mobile PCs with Intel 82430TX and 2 DIMMs or 3 SO-DIMMs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CY2277APVC-12T | 制造商:Cypress Semiconductor 功能描述: |
| CY2277APVC-1M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| CY2277APVC-1T | 制造商:Cypress Semiconductor 功能描述: |
| CY2277APVC-3 | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:6x86, K6 Clock Synthesizer/Driver for Desktop Mobile PCs with Intel 82430TX and 2 DIMMs or 3 SO-DIMMs |
| CY2277APVC4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Interface IC |
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