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SN65HVD33: Differential Impedance

high speed guy
Expert 3505 points
Part Number: SN65HVD33


Hi,

If using the chip as a RS422 driver would it be correct to assume that the differential impedance of the trace (A,B,Y,Z) to be 100 ohms?

Thank you,

HSG

  • 0
    TI__Guru 62920 points

    HSG,

    I may be misunderstanding your question, but the differential impedance of a trace would be determined by its geometry (width, distance to reference plane, etc.) and the dielectric material properties and would be independent of the transceiver used.  You are right, though, that RS-422 signals are typically sent over 100-Ohm cabling and would be terminated via 100 Ohms at the further receiver.  So, if SN65HVD33 were to be used in an RS-422 application it would likely see differential output loading of 100 Ohms.

    Max