ICS889831 datasheet(13/18 Pages) ICST

13 / 18 page

889831AK

www.icst.com/products/hiperclocks.html

REV. A JUNE 16, 2005

Integrated

Circuit

Systems, Inc.

ICS889831

LOW SKEW, 1-TO-4

DIFFERENTIAL LVPECL-TO-LVPECL/ECL FANOUT BUFFER

3.3V

133

3.3V

82.5

LVPECL

Zo = 50

3.3V

82. 5

100

3.3V

0.1u

Zo = 50

0.1u

R10

82.5

133

3.3V

Zo = 50

133

100

Zo = 50

ICS889831

nQ1

nQ2

nIN

VREF_AC

2.5V

82. 5

Zo = 50

FIGURE 8. ICS889831 APPLICATION SCHEMATIC EXAMPLE

SCHEMATIC EXAMPLE

Figure 8 shows a schematic example of the ICS889831. This

schematic provides examples of input and output handling.The

ICS889831 input has built-in 50

Ω termination resistors.The in-

put can directly accept various types of differential signal with-

out AC couple. For AC couple termination, the ICS889831 also

provides the VREF_AC pin for proper offset level after the AC

couple. This example shows the ICS889831 input driven by a

2.5V LVPECL driver with AC couple. The ICS889831 outputs

are LVPECL driver. In this example, we assume the traces are

long transmission line and the receiver is high input impedance

without built-in matched load. An example of 3.3V LVPECL ter-

mination is shown in this schematic. Additional termination ap-

proaches are shown in the LVPECL Termination Application Note.

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