TUSB1044AI datasheet(56/66 Pages) TI1

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can be used to step down to 3.3V. Use decoupling capacitors to reduce noise and improve power supply

integrity. Use a 0.1µF capacitor on each power pin.

9.5 Layout

9.5.1 Layout Guidelines

1. Route RXP/N and TXP/N pairs with controlled 90Ω differential impedance (± 15%).

2. Keep away from other high speed signals.

3. Keep intra-pair routing to within 2 mils.

4. Make sure length matching is near the location of mismatch.

5. Separate each pair at least by 3 times the signal trace width.

6. Keep the use of bends in differential traces to a minimum. When bends are used, make sure the number of

left and right bends are as equal as possible and that the angle of the bend is ≥ 135 degrees. This setup can

minimize any length mismatch causes by the bends and therefore minimize the impact bends have on EMI.

7. Route all differential pairs on the same of layer.

8. Keep the number of VIAS to a minimum. TI recommends to have no more than 1 VIA between TUSB1044A

and Type-C connector and no more than 1 VIA between TUSB1044A and USB3.1 Device/Host.

9. Keep traces on layers adjacent to ground plane.

10. Do NOT route differential pairs over any plane split.

11. Remember that adding test points can cause impedance discontinuity; and therefore, negatively impacts

signal performance. If test points are used, place the test points in series and symmetrically. The test points

must not be placed in a manner that causes a stub on the differential pair.

12. Assuming 1dB/inch loss at 5GHz, make sure the trace length between TUSB1044A and Type-C connector is

no more than 1.5 inches.

13. Assuming 1dB/inch loss at 5GHz, make sure the trace length between TUSB1044A and the USB 3.1 Host/

Device is no more than 8 inches.

14. Select ESD protection devices and EMI suppression devices carefully, and make sure these devices have

excellent transient performance at 10Gbps with flat shunt capacitance characteristics over ±650mV voltage

range. Note small-signal insertion loss characteristics are insufficient to determine suitability of non-linear

devices (ESD devices) for 10Gbps operation

TUSB1044A

SLLSG07 – MARCH 2025

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