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SN74LVC1G99 input transition

Luke Trowbridge55
Prodigy 20 points
Other Parts Discussed in Thread: OPA4170, CD4516B

Hello,

I would like to use use the subject part to interface to signals that transition slowly (50us/V).  I thought that Schmitt inputs would allow this, but the datasheet recommends < 5ns/V for 5V supply.  Is this a mistake, or is there another recommended part?

Thanks,

Luke

  • 0
    TI__Guru 58320 points
    Hi Luke ,

    This is a recommendation but I don't think this should apply for Schmitt trigger inputs . Schmitt trigger inputs are supposed to withstand slow and noisy signals into them .
    what are you using this in the application for and how slow will the signal rate be?
  • 0 in reply to ShreyasRao
    Prodigy 20 points
    OK, that's what I thought. The logic gate is to drive a level-sensitive (not edge sensitive) logic chip (CD4516B CARRY IN input). If the output goes indeterminate or toggles states quickly for a few microseconds, I don't care. I want to use an OPA4170 acting as a comparator to drive the input to this logic gate. I'm assuming that the minimum slew rate on this op-amp is 0.2V/us, providing an input transition rate of 5,000ns/V.

    Luke
  • 0 in reply to Luke Trowbridge55
    TI__Guru 58320 points
    Hi Luke ,

    Schmitt triggers are suited for slow rising edge signals and I would recommend this here .