ICS557-01
PCI-E
XPRESS
C
LOCK
S
OURCE
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
Dimension
2 min to
1.8 min to
Dimension
0.25 to
0.225 min t
ferential Routing on a Single PCB
as coupled
microstrip
100 ohm differential trace.
as coupled
stripline
100 ohm differential trace.
ial Routing to a PCI Express Connector
as coupled
microstrip
100 ohm differential trace.
as coupled
stripline
100 ohm differential trace.
Figure 1: PCI-Express Device Routing
L1
R
S
L1’
R
S
L2
L2’
R
T
L3’
R
T
L3
L4
L4’
ICS557-01
Output
Clock
PCI-Express
Load or
Connector
Typical PCI-Express (HCSL)
Waveform
700 mV
0
t
OR
0.52 V
0.175 V
500 ps
500 ps
t
OF
0.52 V
0.175 V
MDS 557-01 F
In te grated Circuit Systems
●
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