CD4011 vs. CD4049

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mojorizing
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CD4011 vs. CD4049

Post by mojorizing » Wed Aug 23, 2006 12:23 pm

I'm building a circuit where the author uses a CD4011 Quad NAND gate as an inverting buffer between a MAX 232 and a 2N7000 N-ch MOSFET . Both inputs to the NAND gate is actually one lead, split to go to both inputs. Can I safely use an inverting buffer CD4049 (with the lead to one input) in it's place?

Thanks, Mojo

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philba
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Post by philba » Wed Aug 23, 2006 12:35 pm

in general, yes, you can do that if you stay in the same logic family. I've seen a number of circuits like that and guess that the designer happened to have a nand gate available. tI would check the output characteristics and speed of the part, though. In the case of a FET on the output, it should be just fine.

mojorizing
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Post by mojorizing » Wed Aug 23, 2006 12:42 pm

Thanks for the reply, Philba.

I have a tube of CD4049's and no CD4011's. I can understand if the circuit is a prototype and Radio Shack is closed and it's late at night and you don't have the proper logic components so you make a substitution, but this circuit is offered as a kit in production. Hence the question. Thanks again.

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