PI6C49016 Datasheet, PDF (14/16 Pages) Pericom Semiconductor Corporation – Low Power Networking Clock Generator

PI6C49016
Low Power Networking Clock Generator
PCI-Express Layout Guidelines
Common Recommendations for Differential Routing Dimension or Value Unit
L1 length, Route as non-coupled 50 ohm trace.
L2 length, Route as non-coupled 50 ohm trace.
L3 length, Route as non-coupled 50 ohm trace.
R_S
0.5 max
inch
0.2 max
inch
0.2 max
inch
33
ohm
Figure
1,2
1,2
1,2
1,2
Notes
Down Device Differential Routing
Dimension or Value Unit
L4 length, Route as coupled microstrip 100 ohm differential
trace.
2 min to 16 max
inch
L4 length, Route as coupled stripline 100 ohm differential
trace.
1.8 min to 14.4 max
inch
Figure 1: Down Device Routing
Figure
1
1
Notes
Output
Buffer
L1
L2
Rs
L1’
L2’
Rs
L4
L4’
PCI Express Board
Down Device
REF_CLK Input
Figure 2: PCI-Express Connector Routing
Output
Buffer
L1
L2
Rs
L1’
L2’
Rs
L4
L4’
PCI-Express
Add-in Board
REF_CLK Input
13-0102
14
www.pericom.com
PI6C49016
Rev. B
06/25/13