So there is a chip I'm wanting fabricated that will be plugged into using edge connectors / gold fingers 2 completely different systems.
One system is 3.3v CMOS and it has one set of pinouts.
The other system is 5v TTL and it has a completely different set of required pinouts.
All I'm wanting is for one of the 2 sets of pinouts to be connected to the edge pins allowing for bi-directional traffic
When looking at multiplexers, assuming multiplexers are my solution, the problems I'm running into is
- voltage differences
- CMOS/TTL differences
While I'm wanting just a wire connecting the pins to one of two wires it instead determines on it's on whether it's a high or low based off of either CMOS or TTL and then gives the correct output which isn't what I want because one system will use CMOS and the other TTL and the multiplexer only goes off one system so I need it to just pipe the wire through.
Maybe theres another solution and multiplexers aren't it or maybe I need to do this with passive components and skip IC's. I'm not sure what to do but any help would be great.