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THVD1450: The D and R pins of two THVD1450 connection question

Hao Wang14
Expert 4415 points
Part Number: THVD1450

Hi Team,

We want to connect the R and D pins of two THVD1450 together, but no sure if it can work. Could you please help confirm:

1. Can the two R pins connect together? If so, will the R pins do the "And" calculation. For example, the two THVD1450 are act as receiver, when the A/B pins of ① are short, the R of ① will be high; when the R of ② is low, will the UART_RX receive the low? 

Because the datasheet doesn't has the output architecture of the R pin to be push-pull or open drain, so we can't confirm.

Thanks and Best Regards!

Hao

  • 0
    TI__Guru 62920 points

    Hi Hao,

    When the /RE pin is low, the R output uses a push-pull structure.  In this case, you should not connect multiple outputs together since they could contend with one another if driving opposite states.  When /RE is high, though, the R output is high-Z.  So, you could connect multiple R pins together if you control the /RE signals appropriately to only enable one receiver at a time.

    If you wanted to connect multiple active receivers together and do an "AND" function, you could connect a diode to each R output in order to block it from driving a high level and then use a pull-up resistance on the shared net on the other side of the diodes.  This would effectively convert the R output from a push-pull to an open-drain implementation.

    Regards,
    Max