TUSB8044A: Layout

Yadong Duan

Part Number: TUSB8044A
Other Parts Discussed in Thread: TUSB8041,

Tool/software:

Hi Team,

customer want to know the 8 inches between host to HUB or HUB to device. Would you please help me to answer this question?

Many thanks~

2 months ago

0 David (ASIC) Liu 2 months ago

TI__Guru**** 154101 points

Hi,Yadong

Section 11.1.3 describes the layout recommendations for all the TUSB8041 differential pairs: USB_DP_XX, USB_DM_XX, USB_SSTXP_XX, USB_SSTXM_XX, USB_SSRXP_XX, and USB_SSRXM_XX. So the 8in requirement applies toward both the TUSB8044A upstream and the downstream ports using FR4 and standard 6 layer stackup, The insertion loss will vary based on board material and stack up. We can also review their layout to help them achieving the best signal integrity.

Thanks

David

0 Yadong Duan 2 months ago in reply to David (ASIC) Liu

TI__Intellectual 1010 points

Hi Daivd,

If host to HUB up to 6 inches and HUB to device up to 6 inches, and used the cable will cause -2db lose. Does the TUSB8044A support it?

many thanks~

0 Ryan Kitto 2 months ago in reply to Yadong Duan

TI__Mastermind 18100 points

Hello,

Due to a US Holiday, the response to your question may be delayed. We will look into your question when we return tomorrow, July 5th. Sorry for the wait and any inconvenience it may cause.

Thanks,

Ryan

0 David (ASIC) Liu 2 months ago in reply to Ryan Kitto

TI__Guru**** 154101 points

Yadong

Is this a standard USB cable? Where is the cable being used?

The 8in guideline given in the datasheet assumes the host and the hub are on the same PCB without the external cable.

Thanks

David

0 Yadong Duan 2 months ago in reply to David (ASIC) Liu

TI__Intellectual 1010 points

Hi David,

Do you have any layout guidance? many thanks~

Many thanks~

0 Brian Zhou 2 months ago in reply to Yadong Duan

TI__Guru** 117625 points

Hi Yadong:

There is hub layout guidance in datasheet on page 57.

Regards

Brian

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TUSB8044A: Layout