IDT
®
19-Output Differential Zbuffer for PCIe Gen2/3 and QPI 1648H- 12/08/11
9ZX21901C
19-Output Differential Zbuffer for PCIe Gen2/3 and QPI
13
Common Recommendations for Differential Routing Dimension or Value Unit Figure
L1 length, route as non-coupled 50ohm trace 0.5 max inch 1
L2 length, route as non-coupled 50ohm trace 0.2 max inch 1
L3 length, route as non-coupled 50ohm trace 0.2 max inch 1
Rs 33 ohm 1
Rt 49.9 ohm 1
Down Device Differential Routing
L4 length, route as coupled microstrip 100ohm differential trace 2 min to 16 max inch 1
L4 length, route as coupled stripline 100ohm differential trace 1.8 min to 14.4 max inch 1
Differential Routing to PCI Express Connector
L4 length, route as coupled microstrip 100ohm differential trace 0.25 to 14 max inch 2
L4 length, route as coupled stripline 100ohm differential trace 0.225 min to 12.6 max inch 2
DIF Reference Clock
HCSL Output Buffer
L1
L1'
Rs
L2
L2'
Rs
L4'
L4
L3L3'
Rt Rt
PCI Express
Down Device
REF_CLK Input
Figure 1: Down Device Routing
HCSL Output Buffer
L1
L1'
Rs
L2
L2'
Rs
L4'
L4
L3L3'
Rt Rt
PCI Express
Add-in Board
REF_CLK Input
Figure 2: PCI Express Connector Routing