ICS9DB102
Two Output Differential Buffer for PCIe Gen1 & Gen2
SRC Reference Clock
Common Recommendations for Differential Routing
Dimension or Value
0.5 max
Unit Figure
L1 length, route as non-coupled 50ohm trace
inch
inch
inch
ohm
ohm
1
1
1
1
1
L2 length, route as non-coupled 50ohm trace
0.2 max
0.2 max
33
L3 length, route as non-coupled 50ohm trace
Rs
Rt
49.9
Down Device Differential Routing
L4 length, route as coupled microstrip 100ohm differential trace 2 min to 16 max
inch
inch
1
1
L4 length, route as coupled stripline 100ohm differential trace
1.8 min to 14.4 max
Differential Routing to PCI Express Connector
L4 length, route as coupled microstrip 100ohm differential trace 0.25 to 14 max
inch
inch
2
2
L4 length, route as coupled stripline 100ohm differential trace
0.225 min to 12.6 max
Figure 1: Down Device Routing
L2
L1
Rs
Rs
L4
L4'
L2'
L1'
Rt
Rt
HCSL Output Buffer
PCI Express
Down Device
REF_CLK Input
L3' L3
Figure 2: PCI Express Connector Routing
L2
L1
Rs
L4
L4'
L2'
L1'
Rs
Rt
Rt
HCSL Output Buffer
PCI Express
Add-in Board
REF_CLK Input
L3' L3
IDT® Two Output Differential Buffer for PCIe Gen1 & Gen2
852 REV K 04/01/10
6
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
