Need to free up one pin on a 16F project, so looking for ideas a low =20
cost, small footprint way to multiplex some I/O pins.  From all the =20
options, it seems best to multiplex the 3 outputs that control the =20
cathode columns of a 3-digit LED display (via N-channel mosfets), =20
using 2 outputs from the 16F instead.  So I need a demultiplexer, =20
where only one of the two outputs would be high at any time, and an =20
enable pin would sendd both outputs low when the enable pin goes high =20
....(the enable would be the 16F output that directly controls the 3rd =20
digit).  I should be able to fit a SC70-6 on the board, so that would =20
be ideal, though I'm open to other close suggestions.  This will be =20
5V, btw.

So far, some close, but not complete solutions I've found are NL7SZ18, =20
NL7SZ19 (OnSemi), sn74lvc1g2 (TI), etc, but they're not a full =20
solution (I'd have to add a transistor or so to invert a signal here =20
and there).  Before I go code a 10F do this, anyone know of an =20
off-the-shelf demux that would do this easily?  Hoping to have =20
something in the $0.10-$0.20/k price range (the 10F solution would be =20
about twice that).

Cheers,
-Neil.



--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.