Sean, You may be on to something, turns out that Analog has a bunch of switches that we may be able to use. Some of the lines are bidirectional. Vitaliy ----- Original Message ----- From: "Sean Breheny" To: "Microcontroller discussion list - Public." Sent: Sunday, January 31, 2010 23:31 Subject: Re: [EE] Multiplexing non-TTL signals Analog devices makes sub 1 ohm analog switches but I'm sure they are costly. There might even be a cross-point version with lots of inputs and outputs. You might also be able to use high-resistance (about 100 ohm) cheap analog switches followed by analog buffers (fast op-amps, for example) on the outputs. There might even be such a beast available. Do you need each pin to be able to be either input OR output, or is that fixed? Sean On Mon, Feb 1, 2010 at 1:20 AM, Richard Prosser wrote: > Vitaliy, > What about analogue mux's ? You may have to use something better than > the 4051/52/53 series to get a low on resistance though. Otherwise as > long as the voltage is within range it should work OK. Maybe parallel > up devices to get a lower resistance ? > > RP > > On 1 February 2010 17:01, ivp wrote: >>> Any other ideas? >> >> Op-amps ? >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist