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THVD1550: Timing

Hugh Yang
Intellectual 930 points
Part Number: THVD1550

Hi Teams,

Here are some questions about THVD1550.

1) from the data sheet it seems if the TX and RX were disabled together, it takes us to enable again. Is correct?

2) If the Re and DE were connect together. Ideally, the system will not enter 'shutdown' mode. But, if the signal delay is too large or slop is not sharp enough, will the system enter 'shutdown' accidently? If so, is the time limit equal to the disable time? 

Many thanks.

Br,

Hugh

  • 0
    TI__Mastermind 48932 points

    Hi Hugh,

    1. Yes you are correct here. If both RX and TX are disabled it will take microseconds to re-enable the device for RX/TX.

    2. This is defined by the VIH and VIL of the part which is 2V (min) and 0.8V(max) respectively. The device is in an indeterminate state when the control voltage is between 0.8V and 2V. For you direct question specifically - the device may shutdown before the TX/RX enables - enable time (for TX when RX is active and vice versa) is typically 60ns whereas disable time is only typically 30ns. This is more an edge case as the tested delays have a DC voltage applied to either /RE or DE so the enable time for this specific use case may fall somewhere in-between the two specs as the IC's environment is dynamic in the application and wouldn't violate the us range specification. 

    Please let me know if you have any other questions!

    Best,

    Parker Dodson