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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 12th Oct 2018, 3:13 pm   #1
astral highway
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Question Quick query: IC with 2 ENA pins and at least 2 input / outputs

Pretty much as it says up there: operating frequency is around 300KHz.

Obvs I can ignore spare gates.. It doesn’t need to source or sink current. I’m away of motor drive control chips with ENA pin but I doubt these are fast enough.

I have a couple of capable chips here but these would be way too expensive and elaborate this simple job.

A uk -available part ideal to avoid China supply delays .

Cheers folks
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Old 12th Oct 2018, 3:43 pm   #2
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Default Re: Quick query: IC with 2 ENA pins and at least 2 input / outputs

7400?
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Old 12th Oct 2018, 4:26 pm   #3
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Default Re: Quick query: IC with 2 ENA pins and at least 2 input / outputs

Quote:
Originally Posted by merlinmaxwell View Post
7400?
Thats a stalwart of a chip! Something great about using such a work-horse

So ENA is just by using one input per gate?

A=1, ENA (B)=1, Q=1?
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Old 12th Oct 2018, 4:45 pm   #4
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Default Re: Quick query: IC with 2 ENA pins and at least 2 input / outputs

Almost, 7400 is a quad nand, A=1, B=1 so Q=0, use another of the four to invert the output.

It was the easiest gate to fabricate on silicon and all you need is nand to implement any logic function.
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Last edited by merlinmaxwell; 12th Oct 2018 at 4:47 pm. Reason: Added another bit
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Old 12th Oct 2018, 7:31 pm   #5
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Default Re: Quick query: IC with 2 ENA pins and at least 2 input / outputs

Thank you; that’s a great observation , too!
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