• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 304 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.

TMS570LS3137: Input pin absolute maximum rating

CHATBOT
Prodigy 210 points

Part Number: TMS570LS3137

Absolute maximum rating of hercules refers input voltage shall be between 4.6V and -0.3V.


Since we don't adopt damping resisitance for EMIF BUS, so Voltage overshoot and undershoot violate absolute rating above.

But we didn't have troubles at so far.

We think that duration of overshoot and undershoot are very short, so their effect is negligible.

How do you think about it ?

  • 0
    TI__Guru**** 199146 points

    Hi CHATBOT,

    Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. It's better to add series termination resistor to reduce the overshoot and undershoot caused by the signal reflection.

  • 0 in reply to QJ Wang
    Prodigy 210 points

    Thaks for your reply.

    I will consider to add series resistor.

    best regards

  • 0 in reply to CHATBOT
    Prodigy 210 points

    Dear QJ Wang

    I considered series resister temination. But PCBs do not have sufficient area.
    Please let me know if there is a transient absolute maximum rating for both overshoots and undershoots.
    Overshoot of 2n seconds was measured. I hope it's acceptable.
    I also want to know the structure of I/O. Do you have a clamp diode, for example?

    Best regards Chatbot

  • 0 in reply to QJ Wang
    Prodigy 210 points

    Dear QJ Wang

    I considered series resister temination. But PCBs do not have sufficient area.
    Please let me know if there is a transient absolute maximum rating for both overshoots and undershoots.
    Overshoot of 2n seconds was measured. I hope it's acceptable.
    I also want to know the structure of I/O. Do you have a clamp diode, for example?

    Best regards Chatbot

    CHATBOT

  • 0 in reply to CHATBOT
    TI__Guru**** 199146 points

    Hello,

    The I/O block on TMS570LS3137 device has clamp diode. As stated in the datasheet, exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. You need to find a way to reduce the overshoot and undershoot.