# USB 2.0 

Source: [https://docs.qualcomm.com/doc/80-WL740-3/topic/usb.html](https://docs.qualcomm.com/doc/80-WL740-3/topic/usb.html)

For USB 2.0 interface routing, the following guidelines are recommended:
- USB\_DM and USB\_DP signal lines should be handled as differential pairs and
                    length-matched to avoid timing skew and common-mode interference.
- Minimize vias on the USB signal lines as they introduce parasitic inductance and
                    can cause impedance discontinuity.
- It's recommended to place more pairs of ground vias around the USB signal
                    traces.
- Differential impedance should be controlled around 90Ω ± 15%.
- Ensure that there is a complete reference ground plane for the USB signal
                    traces.

Last Published: Apr 08, 2025

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