參數(shù)資料
型號: ICS843256AMI
元件分類: 時鐘產(chǎn)生/分配
英文描述: 333.33 MHz, OTHER CLOCK GENERATOR, PDSO24
封裝: 7.50 X 15.33 MM, 2.30 MM HEIGHT, MS-013, MO-119, SOIC-24
文件頁數(shù): 13/13頁
文件大?。?/td> 222K
代理商: ICS843256AMI
843256AMI
www.icst.com/products/hiperclocks.html
REV. A JUNE 16, 2006
9
Integrated
Circuit
Systems, Inc.
ICS843256I
FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
PRELIMINARY
TERMINATION FOR 3.3V LVPECL OUTPUT
V
CC - 2V
50
50
RTT
Z
o = 50
Z
o = 50
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
125
84
84
Z
o = 50
Z
o = 50
FOUT
FIN
The clock layout topology shown below is a typical termi-
nation for LVPECL outputs. The two different layouts men-
tioned are recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, termi-
nating resistors (DC current path to ground) or current
sources must be used for functionality. These outputs are
FIGURE 3B. LVPECL OUTPUT TERMINATION
FIGURE 3A. LVPECL OUTPUT TERMINATION
designed to drive 50
transmission lines. Matched imped-
ance techniques should be used to maximize operating
frequency and minimize signal distortion.
Figures 3A and
3B show two different layouts which are recommended only
as guidelines. Other suitable clock layouts may exist and it
would be recommended that the board designers simulate to
guarantee compatibility across all printed circuit and clock
component process variations.
INPUTS:
LVCMOS CONTROL PINS:
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional
protection. A 1k
resistor can be used.
RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS
OUTPUTS:
LVPECL OUTPUT
All unused LVPECL outputs can be left floating. We
recommend that there is no trace attached. Both sides of the
differential output pair should either be left floating or
terminated.
相關(guān)PDF資料
PDF描述
ICS843256AMIT 333.33 MHz, OTHER CLOCK GENERATOR, PDSO24
ICS843256AGIT 333.33 MHz, OTHER CLOCK GENERATOR, PDSO24
ICS843256AMLFT 333.33 MHz, OTHER CLOCK GENERATOR, PDSO24
ICS843256AGLFT 333.33 MHz, OTHER CLOCK GENERATOR, PDSO24
ICS843256AM 333.33 MHz, OTHER CLOCK GENERATOR, PDSO24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ICS843256AMLF 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
ICS843256AMLFT 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
ICS843256AMT 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
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