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SN65HVD30-EP: Request for driver output impedance

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Part Number: SN65HVD30-EP

Hi Team,

Our customer is looking for the output impedance of SN65HVD30MDREP.
I see information in the datasheet "RS-485 driver output impedance is on the order of 10 Ω to 30 Ω" but is not specified in the electrical characteristics.

If they want to use serial termination for 100-ohms what is the recommended series resistor values considering the driver output impedance for the Z and Y pins for this device?

Please let me know if you need clarifications from the customer.

Thanks!

Jonathan

  • Jonathan,

    The high-side and low-side driver source impedances for this device are nominally 10 Ohms.  (Although not directly specified as an Electrical Characteristic, it can be inferred based on Figures 6 and 7.)  So, in this case you could try source-side series termination of 40 Ohms on each line.

    Regards,
    Max

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