Question About IC Chips

Mar 28, 2005 44 Replies

Let's say I have an unused logic inverter gate, and somewhere close to it an output which is running at 10MHz.

If I tie the input of the unused gate to the output of the clock signal the earlier unused gate will now run at 10MHz, consuming a lot of power which is wasted. So it is better to tie the unused input to ground or Vcc, which will lock it at a steady state, which will waste a minimum of power.

Roger J.

Oh go have a drink for christ's sake.

More specifically, what part of that long text are you referring to, and why?

Do you know how to select, copy and paste a line of text?

Roger J.

Oh come now, surely you jest.

Your post was specifically related to tying unused inputs to some logic level or other and I added to your post with a link which starts with the header "What should I do with pins I am not using?" If this isn't self explanatory then I feel sorry for you.

As you quoted a text from me and answered with a link I assumed you wanted to reply to what I said, maybe tell me I was wrong or comment what I said, so I spent 5 minutes trying to find out what in that text could be taken as a reply to me, so I was rather irritated when I couldn't find any sense in anything.

If you had bothered to write a few words by yourself, like:

"More on this subject: "

you would have saved me a lot of unnecessary work.

Roger J.

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