ICS84326 Ver la hoja de datos (PDF) - Integrated Circuit Systems
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fabricante
ICS84326
Integrated Circuit Systems
ICS84326 Datasheet PDF : 15 Pages
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS84326
CRYSTAL-TO-3.3V LVPECL
SERIAL ATTACHED SCSI CLOCK SYNTHESIZER/FANOUT BUFFER
TERMINATION FOR 2.5V LVPECL OUTPUT
Figure 3A and Figure 3B show examples of termination for 2.5V
LVPECL driver. These terminations are equivalent to terminat-
ing 50Ω to VCC - 2V. For VCC = 2.5V, the VCC - 2V is very close to
ground level. The R3 in Figure 3B can be eliminated and the
termination is shown in Figure 3C.
2.5V
Zo = 50 Ohm
Zo = 50 Ohm
2,5V LVPECL
Driver
2.5V
R1
R3
250
250
2.5V
+
-
R2
R4
62.5 62.5
FIGURE 3A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
2.5V
Zo = 50 Ohm
Zo = 50 Ohm
2,5V LVPECL
Driver
2.5V
+
-
R1
R2
50
50
R3
18
FIGURE 3B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE
2.5V
Zo = 50 Ohm
Zo = 50 Ohm
2,5V LVPECL
Driver
2.5V
+
-
R1
R2
50
50
84326AM
FIGURE 3C. 2.5V LVPECL TERMINATION EXAMPLE
www.icst.com/products/hiperclocks.html
8
REV. A MARCH 10, 2003
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