ICS9DB102
Two Output Differential Buffer for PCIe Gen1 & Gen2
SRC Reference Clock
Common Recommendations for Differential Routing
Dimension or Value
L1 length, route as non-coupled 50ohm trace
0.5 max
L2 length, route as non-coupled 50ohm trace
0.2 max
L3 length, route as non-coupled 50ohm trace
0.2 max
Rs
33
Rt
49.9
Down Device Differential Routing
L4 length, route as coupled microstrip 100ohm differential trace 2 min to 16 max
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
L4 length, route as coupled stripline 100ohm differential trace
0.225 min to 12.6 max
Unit
inch
inch
inch
ohm
ohm
Figure
1
1
1
1
1
inch
inch
1
1
inch
inch
2
2
Figure 1: Down Device Routing
L1
Rs
L2
L4
L4'
L1'
Rs
HCSL Output Buffer
L2'
Rt
Rt
PCI Express
Down Device
REF_CLK Input
L3'
L3
Figure 2: PCI Express Connector Routing
L1
Rs
L2
L4
L4'
L1'
Rs
HCSL Output Buffer
L2'
Rt
Rt
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 ]
