ICS844252-04 Datasheet, PDF (8/12 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-LVDS CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844252-04
FEMTOCLOCKS™ CRYSTAL-TO-
LVDS CLOCK GENERATOR
RECOMMENDATIONS FOR UNUSED OUTPUT PINS
OUTPUTS:
LVDS
All unused LVDS output pairs can be either left floating or
terminated with 100Ω across. If they are left floating, we
recommend that there is no trace attached.
3.3V LVDS DRIVER TERMINATION
A general LVDS interface is shown in Figure 3. In a 100Ω
differential transmission line environment, LVDS drivers
require a matched load termination of 100Ω across near
the receiver input. For a multiple LVDS outputs buffer, if
only partial outputs are used, it is recommended to termi-
nate the unused outputs.
3.3V
LVDS
R1
100
100 Ohm Differential Transmission Line
3.3V
+
-
FIGURE 3. TYPICAL LVDS DRIVER TERMINATION
844252AG-04
www.icst.com/products/hiperclocks.html
8
REV. A JANUARY 26, 2006