Hi. A line decoder accepts binary input (like say from an address bus) and one of the available output pins will be set to high.

Alright, but is there an IC that works in the reverse? One where if you place a logical high on a particular pin of the several available, will produce a binary number output? Thanks.

 

I think a priority encoder will do what you want. This is a link to the way a priority encoder behaves.

Les.

 

Or a ROM

 

Or a demux, this example 4 control inputs decode into 1/16 outputs.
An analog mux operated inverse also can do this.



Regards, Dana.

 

hi dana,
I 'think' the TS is asking for a Binary pattern output for a single input bit.
A ROM as post #3 @Sensacell would be my choive.
E

 

I stand corrected. Mux inappropriate.

ROM or LUT the way to go. LUT has advantage could be synchronous, so
glitch free outputs. ROM with clocking also could be synch.

Regards, Dana.

 

Also a priority encoder as Les suggested.
For example the CD4532 generates a 3-bit output as determined by which of its 8 inputs is high, and can be expanded to handle any number of inputs.

 

How many pins do you want to encode ?

Regards, Dana.