I need to direct a single line into multiple outputs, so I'm using a MUX to direct the input into the desired outputs (one at a time). However if i ever wanted to do a broadcast to all my output lines at the same time, is there any MUX which allows it ? Can I connect the input to ALL the outputs directly? Thanks in advance
The functionality you appear to require appears to be serviced by what is called a cross-point switch. Usually they have several inputs and several outputs that form an open matrix. Loading a specific code word can connect one input to several outputs simultaneously. They are rarer than multiplexers but they do exist.
The part is shown in this question answered by me.
What is called a "multiplexer" chip usually does the opposite (ie, pick one among several signals and direct it to its output).
So, the answer is "no".
Now, if you want to direct one signal to one (or many) outputs, you will have to decide if the signal is analog or digital, among other things. Since you don't say, we can't know.