ICS557-01 Datasheet, PDF (4/10 Pages) Integrated Circuit Systems – PCI-EXPRESS CLOCK SOURCE

PCI-Express Layout Guidelines
Recommendations for Differential Routing
as non-coupled 50 ohm trace.
as non-coupled 50 ohm trace.
as non-coupled 50 ohm trace.
Dimension
0.5
0.2
0.2
3
49
ferential Routing on a Single PCB
as coupled microstrip 100 ohm differential trace.
as coupled stripline 100 ohm differential trace.
Dimension
2 min to
1.8 min to
ial Routing to a PCI Express Connector
Dimension
as coupled microstrip 100 ohm differential trace.
0.25 to
as coupled stripline 100 ohm differential trace. 0.225 min t
Figure 1: PCI-Express Device Routing
ICS557-01
Output
Clock
L1
R_S
L1’
R_S
L2
L2’
R_T R_T
L3’ L3
Typical PCI-Express (HCSL)
Waveform
700 mV
0
t_OR
500 ps
500 ps
t_OF
0.52 V
0.175 V
0.52 V
0.175 V
ICS557-01
PCI-EXPRESS CLOCK SOURCE
L4
L4’
PCI-Express
Load or
Connector
MDS 557-01 F
4
Revision 011606
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