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參數(shù)資料
| 型號： | CY2276A-21 |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX and 3SO- DIMMs(帶英特爾82440LX 和3SO-DIMM的應(yīng)用于桌上型PC機的奔騰II時鐘合成器/驅(qū)動器) |
| 中文描述： | PentiumII時鐘合成器/桌面電腦與英特爾82440LX和3SO - DIMM內(nèi)存（帶英特爾82440LX和3SO - DIMM內(nèi)存的應(yīng)用于桌上型電腦機的奔騰二時鐘合成器/驅(qū)動器驅(qū)動程序） |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 205K |
| 代理商： | CY2276A-21 |
CY2276A-21
CY2276A-31
11
Application Information
Clock traces must be terminated with either series or parallel termination, as they are 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 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.
CY2276A-21,-31 56 PIN SSOP
Cd = DECOUPLING CAPACITORS
Ct = OPTIONAL EMI-REDUCING CAPACITORS
Cx = OPTIONAL LOAD MATCHING CAPACITOR
Rs = SERIES TERMINATING RESISTORS
XTALIN
XTALOUT
AVDD
VSS
VDDQ3
VDDQ2
IOAPIC
REF
CPUCLK
PCICLK
USBCLK
IOCLK
SDRAM
SCLOCK
SDATA
60/66 SEL
MODE
Cd
Cd
Ct
Rs
Cx
0.1
μ
F
0.1
μ
F
VDD3.3V
VDD2.5V
SCLOCK
SDATA
60/66 SEL
MODE
Cx
VDDCPU
VDD2.5V/3.3V
Cd
0.1uF
IOAPIC
REF
CPUCLK
PCICLK
USBCLK
IOCLK (-31 only)
SDRAM
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CY2276A-31 | PentiumII Clock Synthesizer/Driver for Desktop PCs with Intel 82440LX and 3SO- DIMMs(帶英特爾82440LX 和3SO-DIMM的應(yīng)用于桌上型PC機的奔騰II時鐘合成器/驅(qū)動器) |
| CY2278A | PentiumII Clock Synthesizer/Driver for Mobile PCs with Intel 82430TX and No SDRAM(帶英特爾82430TX和2個DIMM 或3個SO-DIMM 的應(yīng)用于移動PC機的奔騰II6x86, K6 時鐘合成器/驅(qū)動器) |
| CY22800-082A | Universal Programmable Clock Generator (UPCG) |
| CY22800 | Universal Programmable Clock Generator (UPCG) |
| CY22800_07 | Universal Programmable Clock Generator (UPCG) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CY2276APVC-13 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| CY2276PVC-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| CY2276PVC-2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| CY2276PVC-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
| CY2276PVC-4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CPU System Clock Generator |
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