Connect one Input to different Outputs

turbinenreiter wrote 01/11/2016 at 13:33 • 0 points

I'm looking for a part that I hope exists and I don't know the name of.

I imagine a chip, that has one Input pin, many Output pins and and an (I²C) interface, to tell it to which output the input should be feed through.

Does that part exist?

/edit:

Thanks for all the input!I went with an ADG738 Matrix Switch.

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turbinenreiter wrote 01/20/2016 at 21:34

Thanks for all the input!
I went with an ADG738 Matrix Switch.

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Alex Ballantyne wrote 01/20/2016 at 17:56

I think something on this page might be what you need

http://www.nxp.com/products/interface-and-connectivity/interface-and-system-management/i2c/i2c-multiplexers-switches:MC_41851?cof=0&am=0&tab=Products

These are NXP I2C controlled analogue switch devices. There are a variety of devices, connect the inputs together to get the N to M that you need.

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Charles Moeller wrote 01/19/2016 at 18:39

Try "1 line to 8 Demultiplexer "

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Koen van Vliet wrote 01/12/2016 at 11:19

Check out the 74HC259 addressable latch.

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turbinenreiter wrote 01/11/2016 at 14:34

Should have specified - I want analog connectivity like @matseng mentioned. Basically I have a low-voltage AC power source and multiple endpoints I want to connect it to for short times. I think a Matrix Switch like the ADG738 is what I'm looking for.
Thanks for the input. Sometimes you just need to find the right terms.

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Yann Guidon / YGDES wrote 01/11/2016 at 15:04

Yup. However BEWARE of analog muxes : some have suicidal tendencies !
Older ones have no latchup protection and they would burn themselves.
Power sequencing, diodes etc. are necessary, as well as accute datasheet-fu.
On-state resistance can also kill your accuracy...
No wonder I prefer digital electronics ;-)

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turbinenreiter wrote 01/11/2016 at 15:42

Me too, but you gotta hack what you gotta hack.

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Yann Guidon / YGDES wrote 01/11/2016 at 15:44

Good luck ! and don't forget to write a log or two about your adventures ;-)

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dave wrote 01/12/2016 at 06:21

when u say low-voltage AC, can you be more specific? Most ICs are not designed to handle power.

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turbinenreiter wrote 01/17/2016 at 15:30

+#5V, very low current

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Hasan Yavuz Özderya wrote 01/16/2016 at 13:15

How about PSoC? These MCU's have analog multiplexer built-in that can be controlled via firmware. See this for more information http://www.cypress.com/documentation/component-datasheets/analog-multiplexer-amux

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turbinenreiter wrote 01/17/2016 at 15:35

Nice hardware, but no Linux support is a major drag.

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Yann Guidon / YGDES wrote 01/11/2016 at 14:14

Look at the 74HC238.
It's just like the 74HC138 but with 8 NON-inverting outputs.
I use many of these now and I wish I knew it existed before !

At this moment I'm building a dual 1->12 demux (the '238 is easily cascadable) and I'm about to build an octuple 1->8 demux (8->64). The HC family works from 2V to 5V, check the speed though. It might exist as AHC, LVC, LCX, HCT etc. depending on your working voltages.

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turbinenreiter wrote 01/11/2016 at 14:06

Awesome and Thanks a lot!

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Stefan Lochbrunner wrote 01/11/2016 at 14:05

What you are looking for is called a demultiplexer but I couldn't find one that can be controlled via I²C (not to be confused with I²C (de)multiplexers that switch the whole bus). So @matseng's solution sounds like the one to go with.

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matseng wrote 01/11/2016 at 13:54

If you want analog connectivity between in in/out pins the MAX4571 would be a possibility.... It got 11 switches and a i2c interface to control them.

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Connect one Input to different Outputs

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