ics557-05a Integrated Device Technology, ics557-05a Datasheet - Page 6

• Manufacturer Part Number: ics557-05a
• Description: Quad Differential Pci-express Clock Source
• Manufacturer: Integrated Device Technology

PCI-Express Layout Guidelines
PCI-Express Device Routing
Typical PCI-Express (HCSL) Waveform
IDT™ / ICS™ QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE
ICS557-05A
QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE
0
0.175 V
ICS557-05A
t
OR
0.52 V
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.
Output
Clock
S
T
Common Recommendations for Differential Routing
500 ps
Differential Routing to a PCI Express Connector
700 mV
Differential Routing on a Single PCB
500 ps
L1
L1’
0.52 V
R
R
0.175 V
S
S
t
OF
L2’
L2
L3’
R
T
L3
R
6
T
L4’
L4
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
33
PCI-Express
Connector
Load or
ICS557-05A
inch
inch
inch
ohm
ohm
Unit
inch
inch
Unit
inch
inch
Unit
PCIE SSCG
REV H 092407