SN74LVC2G74QDCURQ1 - question

hyeonwoo park

Prodigy 10 points

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?

over 4 years ago

0 Emrys Maier over 4 years ago

TI__Guru* 97046 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 hyeonwoo park over 4 years ago 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 Clemens Ladisch over 4 years ago in reply to hyeonwoo park

Guru 316640 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?

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SN74LVC2G74QDCURQ1 - question