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SN65HVD73: GND level issue

Tommy Tzeng
Genius 5035 points
Part Number: SN65HVD73

Hi ,

the customer use SN65HVD73 for full-duplex change to half-duplex mode, but the output signal always had high level of 0.68v, what caused it?

schematic as below:

  • 0
    TI__Guru 62910 points

    Hi Tommy,

    Is this measured on one of the differential output lines (Y or Z)?  If so, it looks like the expected voltage to me.  The outputs do not swing rail to rail.  There is some voltage drop on VOH with respect to VCC and on VOL with respect to GND due to the output resistance of the driver and its internal reverse-polarity blocking circuitry.  You can see how VOH/VOL are expected to vary with output load current in Figure 1 of the datasheet.  Please let us know if this is not clear or if you have further questions.

    Regards,
    Max

  • 0 in reply to Miguel Robertson
    Genius 5035 points

    Hi Max,

    thanks for your help and reply.