ics557-01 Integrated Device Technology, ics557-01 Datasheet - Page 4

• Manufacturer Part Number: ics557-01
• Description: Pci-express Clock Source
• Manufacturer: Integrated Device Technology

PCI-Express Layout Guidelines
Figure 1: PCI-Express Device Routing
Typical PCI-Express (HCSL) Waveform
IDT™ / ICS™ PCI-EXPRESS CLOCK SOURCE
ICS557-01
PCI-EXPRESS CLOCK SOURCE
ICS557-01
0
L1 length, Route as non-coupled 50 ohm trace.
L2 length, Route as non-coupled 50 ohm trace.
L3 length, Route as non-coupled 50 ohm trace.
R
R
L4 length, Route as coupled microstrip 100 ohm differential trace.
L4 length, Route as coupled stripline 100 ohm differential trace.
L4 length, Route as coupled microstrip 100 ohm differential trace.
L4 length, Route as coupled stripline 100 ohm differential trace.
S
T
Output
Clock
Common Recommendations for Differential Routing
Differential Routing to a PCI Express Connector
0.175 V
t
OR
0.52 V
Differential Routing on a Single PCB
500 ps
L1
L1’
700 mV
500 ps
R
R
S
S
0.52 V
0.175 V
t
OF
L2’
L2
L3’
R
T
L3
R
4
T
0.225 min to 12.6 max
Dimension or Value
Dimension or Value
Dimension or Value
1.8 min to 14.4 max
2 min to 16 max
0.25 to 14 max
0.5 max
0.2 max
0.2 max
49.9
L4’
L4
33
inch
inch
inch
ohm
ohm
inch
inch
inch
inch
Unit
Unit
Unit
Figure
Figure
Figure
1,2
1,2
1,2
1,2
1,2
1
1
2
2
ICS557-01
PCI-Express
Connector
Notes
Notes
Notes
Load or
PCIE SSCG
REV H 062607