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SN75174: Unused Channels for SN75174 and SN75175

JP
Expert 3440 points
Part Number: SN75174
Other Parts Discussed in Thread: SN75175

Hi Team,

I have some unused channels for the SN75174 Line Driver and SN75175 Line Receiver, and I wanted to confirm how to connect the pins of these unused channels. 

The datasheet didn't provide any indication on how to handle unused channels, and on other Line Driver/Receivers I typically ground the input pins and leave the output floating. Can you confirm if this is the recommended approach?

Regards,

JP

  • +1
    TI__Mastermind 46317 points

    Hi JP,

    Your thought process is mostly correct - ground inputs and leave outputs floating is 100% okay for unused channels on the driver.  The differential receiver is a bit different as the non-inverting pin and inverting  pin of the differential receiver should be pulled to different levels - i.e. A to VCC and B to GND - since its measuring the voltage between A and B and 0V is undefined. 

    Just as a quick overview:

    SN75174:

    "A" pins - cannot leave floating - either tie to GND or device VCC. 

    Y/Z pins - can be left floating

    EN - enable pins can't be left floating - if channel is unused tie to GND. 

    SN75175:

    "A" pins - cannot leave floating - tie to VCC

    "B" pins - cannot leave floating - tie to GND

    "Y" pins - can leave floating

    EN pins - can't be left floating - if channel is unused tie to GND. 

    Please let me know if you have any other questions!

    Best,

    Parker Dodson