ICS557-01 Datasheet, PDF (5/10 Pages) Integrated Circuit Systems – PCI-EXPRESS CLOCK SOURCE

LVDS Compatible Layout Guidelines
LVDS Recommendations for Differential Routing
L1 length, Route as non-coupled 50 ohm trace.
L2 length, Route as non-coupled 50 ohm trace.
R_P
R_Q
R_T
L3 length, Route as coupled 50 ohm differential trace.
L3 length, Route as coupled 50 ohm differential trace.
ICS557-01
PCI-EXPRESS CLOCK SOURCE
Dimension or Value Unit
0.5 max
inch
0.2 max
inch
100
ohm
100
ohm
150
ohm
Figure 3: LVDS Device Routing
ICS557-01
Clock
Output
L1
R_Q
L1’
R_T
L3
L3’
R_T
L2’ L2
Typical LVDS Waveform
1325 mV
1000 mV
t_OR
500 ps
1250 mV
1150 mV
500 ps
t_OF
1250 mV
1150 mV
R_P
LVDS
Device
Load
MDS 557-01 F
5
Revision 011606
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