Hi List,

Say we have a circuit with a number of different signal lines (CAN, RS232, 
etc) that we'll call A, B, C, D. Now imagine that we have a connector with 
13 pins (1 thru 13). Finally, we have a requirement to switch any line to 
any pin (e.g., B can go to any pin, 1 thru 13).

If the lines were TTL, one could use a 1-to-13 multiplexor on each pin (and 
the software would ensure that no two signals are wired to the same pin). 
However, what do you do if the lines can have different voltages and won't 
tolerate a high series impedance (>10 Ohms)?

Reed relays and FETs (perhaps wired through multiplexors to reduce required 
PIC pin count) naturally come to mind. Unfortunately, using discrete 
components means excessively high BOM and assembly costs.

Any other ideas?

Thank you in advance,

Vitaliy 

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