932SQ426_16 Datasheet, PDF (18/25 Pages) Integrated Device Technology – DERIVATIVE SUPPORTING SRNS PCIE CLOCKING

932SQ426
CK420BQ DERIVATIVE SUPPORTING SRNS PCIE CLOCKING
DIF Reference Clock
Common R ecommendations for Differential Routing
D imension or Value
L1 length, route as non-coupled 50ohm trace
0.5 max
L2 length, route as non-coupled 50ohm trace
0.2 max
L3 length, route as non-coupled 50ohm trace
0.2 max
Rs
33
Rt
4 9.9
Down Device Differential Routing
L4 length, route as coupled microstrip 100ohm differential trace
L4 length, route as coupled stripline 100ohm differential trace
2 min to 16 max
1.8 min to 14.4 max
Differential Routing to PCI Express Connector
L4 length, route as coupled microstrip 100ohm differential trace
L4 length, route as coupled stripline 100ohm differential trace
0.25 to 14 max
0.225 min to 12.6 max
Unit Figure
inch 1
inch 1
inch 1
ohm 1
ohm 1
inch 1
inch 1
inch 2
inch 2
Figure 1: Down Device Routing
L1
L2
Rs
L1'
HCSL Output Buffer
L2'
Rs
Rt
L4
L4'
Rt
L3' L3
PCI Express
Down Device
REF_CLK Input
Figure 2: PCI Express Connector Routing
L1
L2
Rs
L4
L1'
HCSL Output Buffer
L2'
Rs
Rt
L4'
Rt
PCI Express
Add-in Board
REF_CLK Input
L3' L3
IDT® CK420BQ DERIVATIVE SUPPORTING SRNS PCIE CLOCKING
18
932SQ426
REV C 022916