ICS9FG108 Datasheet, PDF (15/19 Pages) Integrated Circuit Systems – Programmable FTG for Differential P4 CPU, PCI-Express & SATA Clocks

ICS9FG108
Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
DIF Reference Clock
Common Recommendations for Differential Routing
Dimension or Value
L1 length, Route as non-coupled 50 ohm trace.
0.5 max
L2 length, Route as non-coupled 50 ohm trace.
0.2 max
L3 length, Route as non-coupled 50 ohm trace.
0.2 max
Rs
33
Rt
49.9
Unit Figure
inch 1
inch 1
inch 1
ohm 1
ohm 1
Down Device Differential Routing
L4 length, Route as coupled microstrip 100 ohm differential trace.
L4 length, Route as coupled stripline 100 ohm differential trace.
Dimension or Value
2 min to 16 max
1.8 min to 14.4 max
Unit Figure
inch 1
inch 1
Differential Routing to PCI Express Connector
L4 length, Route as coupled microstrip 100 ohm differential trace.
L4 length, Route as coupled stripline 100 ohm differential trace.
Dimension or Value Unit Figure
0.25 to 14 max
inch 2
0.225 min to 12.6 max inch 2
Figure 1 Down device routing.
L1
L2
Rs
L4
L4’
L1’
L2
Rs
Rt Rt
HSCL Output
Buffer
L3’ L3
Figure 1
Figure 2 PCI Express Connector Routing.
L1
L2
Rs
L4
L4’
L1’
L2’
Rs
Rt Rt
HSCL Output
Buffer
L3’ L3
Figure 2
PCI Ex Board
Down Device
REF_CLK Input
PCI Ex
Add In Board
REF_CLK Input
IDT^TM/ICS^TM Frequency Generator for CPU, QPI, FBD, PCIe Gen 2 & SATA
15
ICS9FG108 REV G 04/06/07