8.2.3 Application Curves

MP1800 BERT

5Gbps, 680mVpp

PRBS7

Input PCB trace

25" FR-4

-10.5dB Loss

Output PCB trace

1.0" FR-4

-0.8dB Loss

DCAX

35GHz BW

PTB

TUSB522

RX2 > TX2

EQ = H, OS = L, DE = L

1ft SMP-SMP cable

1ft SMP-SMP cable

1ft SMP-SMP cable

BERT > 24"6mil > char-board > RX2-to-TX2 > char-board > Scope

8.3 Power Supply Recommendations

The TUSB522P is designed to operate with a 3.3-V power supply. Levels above those listed in the Absolute

Ratings table should not be used. If using a higher voltage system power supply, a voltage regulator can be used

to step down to 3.3 V. Decoupling capacitors should be used to reduce noise and improve power supply integrity.

A 0.1-µF capacitor should be used on each power pin.

8.4 Layout

8.4.1 Layout Guidelines

• RXP/N and TXP/N pairs should be routed with controlled 90-Ω differential impedance (±15%).

• Keep away from other high speed signals.

• Intra-pair routing should be kept to within 2mils.

• Length matching should be near the location of mismatch.

• Each pair should be separated at least by 3 times the signal trace width.

• The use of bends in differential traces should be kept to a minimum. When bends are used, the number of left

and right bends should be as equal as possible and the angle of the bend should be ≥ 135 degrees. This will

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

• Route all differential pairs on the same of layer.

• The number of VIAS should be kept to a minimum. It is recommended to keep the VIAS count to 2 or less.

• Keep traces on layers adjacent to ground plane.

• Do not route differential pairs over any plane split.

• Adding test points will cause impedance discontinuity; and will therefore, negatively impact signal

performance. If test points are used, they should be placed in series and symmetrically. They must not

be placed in a manner that causes a stub on the differential pair.

• The 100-nF capacitors on the TXP and SSTXN nets must be placed close to the USB connector (Type A,

Type B, and so forth).

www.ti.com

TUSB522P

SLLSEV9E – JULY 2016 – REVISED NOVEMBER 2023

Copyright © 2023 Texas Instruments Incorporated

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Product Folder Links: TUSB522P