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ICS843251AG-04T Datasheet(PDF) 7 Page - Integrated Circuit Systems

Part # ICS843251AG-04T
Description  FEMTOCLOCKS??CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS843251AG-04T Datasheet(HTML) 7 Page - Integrated Circuit Systems

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843251AG-04
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 12, 2005
7
Integrated
Circuit
Systems, Inc.
ICS843251-04
FEMTOCLOCKS™CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
PRELIMINARY
TERMINATION FOR 3.3V LVPECL OUTPUT
The clock layout topology shown below is a typical termination
for LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs.Therefore, terminat-
ing resistors (DC current path to ground) or current sources
must be used for functionality. These outputs are designed to
FIGURE 3B. LVPECL OUTPUT TERMINATION
FIGURE 3A. LVPECL OUTPUT TERMINATION
drive 50
Ω transmission lines. Matched impedance 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.
V
CC - 2V
50
Ω
50
Ω
RTT
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
Ω
125
Ω
84
Ω
84
Ω
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN


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