Differential Trace Information

Differential signal pairs need to be routed in parallel with a specific, constant distance. Differential pair signals need to be routed symmetrically. It is not permitted to place any components or vias between the differential pairs, even if the signals are routed symmetrically. Any vias needed on the signal path itself need to be placed in pairs and symmetrically. All traces of a signal and all signals as a whole must be length matched to eliminate skew. It is strongly recommended to route the clock and data lanes on the same layer, between ground and power planes.

 

I/O

Zo (Ohm) ± 12%

Max. Routing Length (mils)

Min. Ratio Intra-Pair Space

Intra-Pair Mismatch Limit

Min. Ratio Inter-Pair Space

Note

HDMI

80-85

4200

1:1

+/- 5 mil

4:1

 

USB 3.0

80-85

5900

1:1

+/- 10 mil

4:1

1

USB 2.0 OTG

80-85

9900

1:1

+/- 20 mil

4:1

1

Note: Spacing to adjacent interfaces to follow Min. Ratio Inter-Pair Spacing.

USB maximum length is for OTG detection topology without FPC.

For more complete information about compiler optimizations, see our Optimization Notice.