ICS951413 Datasheet, PDF (20/23 Pages) Integrated Circuit Systems – Programmable System Clock Chip for ATI RS400 P4-based Systems

Integrated
Circuit
Systems, Inc.
ICS951413
SRC 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
Down Device Differential Routing
L4 length, Route as coupled microstrip 100 ohm
differential trace.
L4 length, Route as coup led stripline 100 ohm
differential trace.
Dimension or Value
2 min to 16 max
1.8 min to 14.4 max
Differential Routing to PCI Express Connector
L4 length, Route as coupled microstrip 100 ohm
differential trace.
L4 length, Rout e as coupled stripline 100 ohm
differential trace.
Dimension or Value
0.25 to 14 max
0.225 min to 12.6
max
Unit
inch
inch
inch
ohm
ohm
Figure
2, 3
2, 3
2, 3
2, 3
2, 3
Unit
inch
Figure
2
inch 2
Unit
inch
Figure
3
inch 3
Fig.1
L1
L2
Rs
L4
L4’
L1’
L2’
Rs
Rt Rt
HSCL Output
Buffer
L3’ L3
Fig.2
L1
L2
Rs
L4
L4’
L1’
L2’
Rs
Rt Rt
HSCL Output
Buffer
L3’ L3
Fig.3
L1
L2
Rs
L4
L4’
L1’
L2’
Rs
Rt Rt
HSCL Output
Buffer
L3’ L3
PCI Ex
REF_CLK
Test Load
PCI Ex Board
Down Device
REF_CLK Input
PCI Ex
Add In Board
REF_CLK Input
0929C—03/07/05
20