I want to amplify some TTL-level signals for better noise immunity=20
through about 10'-15' of wire through a vehicle, and trying to figure=20
out what good options there are.  The data being transmitted is a custom=20
signal (not exactly async serial, and not exactly PWM) of approx=20
50-100khz, at 5V.  Only one data-line out and one data-line back in.  It=20
works now, but noise issues we've experienced in other areas has me=20
worried, and the board is being revised currently, so I want to add this=20
also.  The wiring/harness is pretty much set in stone so I can't really=20
twist, shield or add wires for differential signaling, etc.  The=20
electronics at both sides of the line is pretty much all I can change.

First thought is 74xx245's etc, but have the impression they're really=20
for strengthening signals for driving higher loads over short distances=20
(ie: still chip-to-chip comms).  The last time I used these was  a few=20
decades ago with a Z80 processor.  Not sure I should use it for long=20
wires across devices.  Another option is to use discrete transistor=20
push-pull drivers.  Also, I'm sure I can use a MAX3232 or similar for=20
this.  But are there any other better options?  Looking at digikey gives=20
me 10k+ options, and filtering by package, supply-voltage, cost, etc=20
still nets me a couple thousand options.  Favourite devices?

Cheers,
-Neil





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