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SN65HVD234: SN65HVD234DR part - Slew rate selection by using RS Pin for 1Mbps

Asha C
Prodigy 140 points
Part Number: SN65HVD234
Other Parts Discussed in Thread: TCAN3414, TCAN330

Could you please let know the slew rate which is needed for having a maximum data transfer of 1Mbps . This would be helpful to choose the RS pin resistor.

  • 0
    Guru 256060 points

    As a rule of thumb, the rise/fall time should be less than one tenth of the bit time. So assuming VOD = 2 V, the limit would be 2 V / 100 ns = 20 V/µs, i.e., you should not use any resistor at all. (This is plausible because you are using the transceiver's maximum data rate.)

  • 0 in reply to Clemens Ladisch
    Prodigy 140 points

    In this case , As per the graph mentioned in the datasheet , for 20V/us , it is almost 0kohm , should we tie the Rs pin to GND in this case?

    Is this same for SN65HVD234 as well? In below graph it is mentioned as HVD233?

  • 0 in reply to Asha C
    Guru 256060 points

    As shown in the graph, 20 V/µs is achieved with 0 Ω.

    The '233 and '234 use the same slope control mechanism.

  • 0
    TI__Mastermind 49975 points

    Thanks Clemens!

    Hi Asha,

    I agree that for use with the maximum data rate for this device that a 0-ohm resistor should be used for the slope control input. 

    Please also consider the use of a newer device such as the currently available TCAN330 family or upcoming TCAN3414 family. These devices a offer better cost structure and overall performance compared to the older "SN" part numbers. They are also mostly pin compatible with older transceivers so updating older designs should be possible, and integrating into new designs is easy. Let me know if you have any questions on these devices and how they may benefit your application. 

    Regards, 
    Eric Schott