multiplexer question

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panfilero 19 years ago

Hello, I was wondering if there is such a thing as a 16 to 1 multiplexer. I need something that can connect 16 individual inputs to

1 output 1 at a time in sequence. But I'm having trouble finding a
16:1 MUX. Also, I ordered some chips from mouser, and some are big enough to stick in my bredboard but a lot of them were real tiny... does anyone know what's up with the real tiny ones? I couldn't find in the name of the chip something that would let me know that it was going to be too tiny to fit in a regular solderless breadboard.

thanks

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JeffM 19 years ago

Hey, who really cares what this idiot posts?

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To the OP: Your questions belong in sci.electronics.basics AND ONLY IN sci.electronics.basics.

If you STILL insist on splattering your crap everywhere, read the last half of this thread:

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*-*-*-*-*-*-*-*-appear+*-proper-answer-*-*-*-given+much-easier-*-*-*-*-*-*-*+*-frowned-on+*-correcting+*-Followup-To-*+*-*-_perfect_-*-*-*-*+*-*-*-too-lazy-*-*-*-*-*-appropriate-*+*-polite-*-mention-*-*-*-*-*-*-*+Just-because-*-*-*-*-*-*-*-*-does-not-mean-*-*-*-*-*-*+mark-*-*-*-*-all-*-groups+*-*-*-*-two-groups-*-*-aren't-*-different

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wickedwhich 19 years ago

I guess you do or you wouldn't waste your time responding. Why do you try to insult him/her in the process? It is obvious that this person needs some information and that is what this group is for. If you want to treat it like a chat room and insult people, go the Yahoo "fight room".

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*-*-*-*-*-*-*-*-appear+*-proper-answer-*-*-*-given+much-easier-*-*-*-*-*-*-*+*-frowned-on+*-correcting+*-Followup-To-*+*-*-_perfect_-*-*-*-*+*-*-*-too-lazy-*-*-*-*-*-appropriate-*+*-polite-*-mention-*-*-*-*-*-*-*+Just-because-*-*-*-*-*-*-*-*-does-not-mean-*-*-*-*-*-*+mark-*-*-*-*-all-*-groups+*-*-*-*-two-groups-*-*-aren't-*-different

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JeffM 19 years ago

You're wrong, idiot top-poster. "What s.e.d is NOT" by Michael Black

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*+the-purpose-of-this-newsgroup+qq+*-*-some-circuit-you-don't-understand+combining-*-*-*+*-*-belongs-in+uu+*-*-not-*-*-*-a-tutorial-newsgroup

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John Larkin 19 years ago

Usually one uses two 8:1 mux's, HC4051's or some such. Connect their address and output pins, but enable one at a time.

These are nice adapters for tiny parts:

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Ignore JeffM. He's a typical self-appointed expert who actually contributes little.

John

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panfilero 19 years ago

Thanks for the tip and the links, I appreciate the help. I'm trying to make a little drum machine and couldn't figure out how to get the 16 inputs hooked up, I think linking two 8:1's should do it.

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Joerg 19 years ago

There is also the CD4051 if you need higher voltage capability. No free lunch though since that would require corresponding logic levels to address it.

There are specialty chips for telecom applications with 16 or even a lot more inputs. Often called "crosspoint switches" because they can mux each input to a number of outputs or can be cascaded to do that. But those things are usually very expensive and hard to buy.

Regards, Joerg http://www.analogconsultants.com

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martin.shoebridge 19 years ago

I would use 16 diodes as a 16 input OR, connected to an interrupt pin.Then connect the 16 inputs to 16 I/O pins. On interrupt, poll the 16 pins to see which one caused the interrupt. Efficient, quick and low cost.

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