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I'm trying to find an IC implementing 2-1 multiplexers, but I could only seem to find chips like this: SN54LVC157A - Quadruple 2-line to 1-line data selectors/multiplexers.

Where there are 2 groups of multiple inputs and 1 of these groups is selected for the output (essentially a bunch of 2-1 muxes with shared select inputs). Instead, I want 2-1 muxes where there are separate select inputs. Anyone know of such a chip? Or is there a reason why these are not readily available?

Basically, we need to implement some combinational logic on a breadboard for a lab, and we found we could do it with significantly less gates if we use muxes.

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  • \$\begingroup\$ Anything with multiple muxes on one chip? Maybe in a 14-pin package? \$\endgroup\$ – sciencectn May 18 '12 at 23:55
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There are several common logic ICs available in small/single versions today. The HC157 has a two-input version in the 74AUP1G157. This is a basic 2-to-1 multiplexer. The 2G157 Brian mentions in his answer has an additional enable input and complementary outputs.

As far as I know there are no multiple 2-to-1 digital logic multiplexers. But there's no reason not to use several 74AUP1G157s on your board. The 1G157 is available in a SOT1115 package, which is less than 1mm\$^2\$.

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Three or even four of those are smaller than a typical 14-pin SMT package. May not be the easiest solution for DIY, though.

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TI little logic mux/demux. You are looking for SN74xxx1G157., probably SN74LVC2G157 which is a 2:1 mux.

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If you want to implement something on a breadboard, you could use the ADG1634 from Analog Devices, which has four independently-controlled analog SPDT switches (which can also switch digital signals) in a 20-pin TSSOP package.

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You can use an adapter like this one to convert to a DIP.

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Note that they also exist in dual or single version. See this overview.

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  • \$\begingroup\$ This is a good alternative to the digital mux, but you should be aware of switching glitches. Break-before-make time is 44ns typical, max not specified. If both inputs are low, and the output has a pull-up, you'll get a positive pulse when switching. The digital logic mux won't have this phenomenon. If you can avoid the glitch this is a good idea, though. \$\endgroup\$ – stevenvh May 19 '12 at 8:31
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The very common CD4053 is 3 independent MUXes on a PDIP chip. Plus being a jelly bean 4000 series, it will work on 3-15V so is pretty handy for breadboarding/experimentation. It is an analog switch, so can switch bidirectional digital signals as well.

http://www.geofex.com/article_folders/cd4053/cd4053.htm

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