TLK2711-SP: Maximum trace length

Anand Badiger

Prodigy 220 points

Part Number: TLK2711-SP

Hi,

What is the allowed maximum trace length for the each group TXD0/TXD15, RXD0/RXD15, DINRXP/N and DOUTTXP/N on PCB?

What is the length matching tolerance for the above signals?

Please let me know.

over 5 years ago

0 Rodrigo Natal over 5 years ago

TI__Mastermind 19235 points

For guidance on the high-speed serial interface maximum length you may reference the previous E2E post per link below.

https://e2e.ti.com/support/interface/f/138/t/849109?tisearch=e2e-sitesearch&keymatch=tlk2711-sp%25252520trace%25252520length

I could not track down length matching tolerance data for the 16-bit parallel interface. I would recommend to reference the IEEE GMII timing requirements as a guideline.

Cordially,

Rodrigo Natal

HSSC Applications Engineer

0 Anand Badiger over 5 years ago in reply to Rodrigo Natal

Prodigy 220 points

Thank you for the information.

But i am not cleared about what is the maximum allowed length for parallel data lines?

Can you please help?

0 Lee Sledjeski over 5 years ago in reply to Anand Badiger

TI__Mastermind 43795 points

Hi Anand,

The maximum distance of the parallel traces will be determined by the trace attenuation. Typically, the parallel interface can handle >1dB of loss at 125MHz (which is the maximum clock frequency for the parallel interface. For a typical 7 mil FR4 microstrip 1dB of loss at 125 MHz will take ~ 13 inches of trace. If the traces are wider or the clock frequency is lower, it will take a longer trace length to result in 1 dB of loss.

Regards,

Lee

0 Anand Badiger over 5 years ago in reply to Lee Sledjeski

Prodigy 220 points

Thank you Lee for the information.

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TLK2711-SP: Maximum trace length