• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 22 subscribers
  • Views 324 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.

LMK1D2108: LMK1D2108

Andy Jackson
Prodigy 70 points
Part Number: LMK1D2108

What is the output state or behavior when the inputs are floating or at least are not toggling?  Are they held at certain levels, held at their previous levels, or something else?

Section 8.3.1 of the January 2022 datasheet talks about the "Fail-Safe Input" feature, which implies that if the inputs are floating the part won't oscillate, which I assume means the outputs will not toggle.  If you could confirm that would be helpful, if it's possible to say the exact state of the outputs when inputs are floating/not toggling, that would be greatly appreciated.

Thanks,

Andy

  • 0
    TI__Genius 11960 points

    Hi Andy, 

    When the inputs are floating, the outputs will be in a logic low state meaning the OUTP voltage will be VOL, and the OUTN voltage will be VOH. Let me know if this answers your question. 

    Regards, 

    Connor 

  • 0 in reply to Connor Lewis
    Prodigy 70 points

    Thanks Connor.  What if the differential inputs are just stopped, with INx_P at Vil or Vih, and INx_N at the opposite signal level?

    Thanks,

    Andy

  • 0 in reply to Andy Jackson
    TI__Genius 11960 points

    Hi Andy, 

    The outputs will match the logic state of the input, for example:

    INx_P = VIH, INx_N = VIL: OUTx_P = VOH, OUTx_N = VOL (logic high on both the input and output)

    INx_P = VIL, INx_N = VIH: OUTx_P = VOL, OUTx_N = VOH (logic low on both the input and output) 

    If the input is floating, it will be treated the same as a logic low. There's also some hysteresis on the input so if it's left floating the output won't accidentally toggle. 

    Regards, 

    Connor