• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 34 subscribers
  • Views 93 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

THVD1550: Question about stanby mode.

Kazuya Nakai59
Guru 22305 points

Part Number: THVD1550

Hello guys,

One of my customers is evaluating THVD1550 for their new products.

At this moment, they have the following question.
Could you please give me your reply?

Q.
They want to avoid the THVD1550 entering standby mode. When switching DE from enabled (H) to disabled (L), after switching /RE from disabled (H) to enabled (L), what is the minimum amount of time between each transient timing which is needed to avoid entering  standby mode?

Your reply would be much appreciated.

Best regards,
Kazuya.

  • 0
    TI__Mastermind 24352 points

    Hi Kazuya,

    What is their exact concern with entering Standby mode? Is it that the receiver pin won't stay biased? Entering Standby mode shouldn't be a concern unless the longer enable time of ~4us is too long. 

    The times you are referring to are "tPHZ" and "tPLZ" for both the driver and receiver in the Switching Characteristics section of the datasheet. It lists the enable and disable times for both. We do not specify the exact time it takes for this transceiver to enter Standby mode. Standby mode is the condition where both driver/receiver are disabled. Your customer can use these enable/disable times to avoid having both driver/receiver disabled at the same time (hence avoiding Standby mode). 

    Note that the enable times are dependent on whether the other function is enabled. When both driver and receiver are disabled, it takes more time for the transceiver to wake up one of those functions. 

    For instance, this is why the receiver enable time is longer when DE=0V. This implies that when the driver is disabled, the transceiver is in this Standby mode, so enabling the receiver takes more time.

    Best,

    Ethan