9DB1904BKLF IDT [Integrated Device Technology], 9DB1904BKLF Datasheet - Page 10

• Manufacturer Part Number: 9DB1904BKLF
• Description: 19 Output Differential Buffer for PCIe Gen2 and QPI
• Manufacturer: IDT [Integrated Device Technology]

IDT
9DB1904B
19 Output Differential Buffer for PCIe Gen2 and QPI
®
19 Output Differential Buffer for PCIe Gen2 and QPI
L1 length, route as non-coupled 50ohm trace
L2 length, route as non-coupled 50ohm trace
L3 length, route as non-coupled 50ohm trace
Rs
Rt
L4 length, route as coupled microstrip 100ohm differential trace 2 min to 16 max
L4 length, route as coupled stripline 100ohm differential trace
L4 length, route as coupled microstrip 100ohm differential trace 0.25 to 14 max
L4 length, route as coupled stripline 100ohm differential trace
Common Recommendations for Differential Routing
Figure 1: Down Device Routing
HCSL Output Buffer
Differential Routing to PCI Express Connector
Figure 2: PCI Express Connector Routing
HCSL Output Buffer
Down Device Differential Routing
L1'
L1
L1'
L1
Rs
Rs
DIF Reference Clock
Rs
Rs
L2'
L2
10
L2'
L2
Rt
L3'
Rt
L3'
L3
Rt
0.5 max
0.2 max
0.2 max
33
49.9
1.8 min to 14.4 max
0.225 min to 12.6 max
L3
Dimension or Value
Rt
L4'
L4
L4'
L4
REF_CLK Input
Add-in Board
PCI Express
REF_CLK Input
Down Device
PCI Express
ohm
ohm
Unit
inch
inch
inch
inch
inch
inch
inch
Figure
1607C—04/19/11
1
1
1
1
1
1
1
2
2