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THVD1450: R pin, pull-up resistor

user4870844
Prodigy 10 points
Part Number: THVD1450

Hello,

I would like to understand why the receive data output pin (R) needs the pull-up resistor os 10KOhm.

Since this is a push-pull output, the insertion of a pull-up resistor would not be necessary, right?

Thanks in advance

  • 0
    TI__Guru 62920 points

    Hello,

    It's a push-pull output that is enabled when /RE is low.  So, as long as /RE is low (i.e., receiver is enabled) a pull-up is not needed.  The pin goes high impedance when /RE is high, though.  If the system expects a high level on R when the receiver is disabled, then, it should be pulled up externally.  Please let me know if this is not clear.

    Regards,
    Max