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ICS843404 Datasheet(PDF) 13 Page - Integrated Circuit Systems

Part # ICS843404
Description  LVCMOS/CRYSTAL-TO-3.3V LVPECL AND LVDS CLOCK GENERATOR
PDF  19 Pages
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS843404 Datasheet(HTML) 13 Page - Integrated Circuit Systems

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843404AG
www.icst.com/products/hiperclocks.html
REV. A OCTOBER 17, 2005
13
Integrated
Circuit
Systems, Inc.
ICS843404
LVCMOS/CRYSTAL-TO-3.3V LVPECL AND
LVDS CLOCK GENERATOR
TERMINATION FOR 2.5V LVPECL OUTPUT
Figure 5A and Figure 5B show examples of termination for 2.5V
LVPECL driver. These terminations are equivalent to terminat-
ing 50
Ω to V
DD - 2V. For VDDO = 2.5V, the VDDO - 2V is very close to
ground level. The R3 in Figure 5B can be eliminated and the
termination is shown in Figure 5C.
FIGURE 5C. 2.5V LVPECL TERMINATION EXAMPLE
FIGURE 5B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
FIGURE 5A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
R2
62.5
R3
250
2.5V
VDDO=2.5V
Zo = 50 Ohm
R1
250
+
-
2,5V LVPECL
Driv er
R4
62.5
2.5V
Zo = 50 Ohm
Zo = 50 Ohm
+
-
VDDO=2.5V
R2
50
R1
50
2,5V LVPECL
Driv er
2.5V
R3
18
Zo = 50 Ohm
Zo = 50 Ohm
R1
50
VDDO=2.5V
2.5V
R2
50
2,5V LVPECL
Driv er
Zo = 50 Ohm
+
-



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