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SN74LVC2G74QDCURQ1 - question

hyeonwoo park
Prodigy 10 points

Hi 

The circuit was configured in the same way as in the above application note.

If the Q pin normal operates despite maintaining the normal state on the CLK pin, what part should be checked?

Is there any other reason other than noise influx in this case?

  • 0
    TI__Guru* 96947 points

    Hello,

    I'm afraid I don't understand the question.

    You said Q is operating normally, and CLK is operating normally -- is there some kind of problem that needs checking?

    Can you provide a scope shot of operation and the noise you mentioned?

  • 0 in reply to Emrys Maier
    Prodigy 10 points

    ch1 CLK 5V/div

    thank you for your comment.

    C1(yellow) : CLK pin 5V/div.

    C3(bule) : Q pin 5V/div.

    The CLK pin is not input, but only the Q pin seems like to be incorrect operation.

    Is it just noise?

  • 0 in reply to hyeonwoo park
    Guru 295470 points

    This looks as if there is a large amount of noise in your system. Do you have long traces or cables that could act as an antenna? Do you have conducted noise? Can you show a photo of the circuit, and how you measure it?

    What happened at 1.5 s? Did the Q output go down again, or did the oscilloscope stop after triggering?