SN65C1168E-SEP: RS422 trace impedance

Briana Spaugh

Part Number: SN65C1168E-SEP

Hi,

I'm using RS-422 transceiver part number SN65C1168E-SEP. Should the PCB trace impedance be 100-ohm or 120-ohm differential?

https://www.ti.com/product/SN65C1168E-SEP

Thanks,

Briana

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 243920 points

The transceiver itself does not care.

What matters is that the termination resistor should have the same resistance as the cable's or trace's characteristic impedance.

+1 Parker Dodson over 1 year ago

TI__Mastermind 43516 points

Hi Briana,

RS-422 uses 100 Ohm termination - so the trace impedance should also be 100 Ohms to prevent reflections. Clemens is correct by saying the transceiver itself doesn't really care.

Best,

Parker Dodson

Interface

Interface forum

SN65C1168E-SEP: RS422 trace impedance