> I am designing a system in which a number of 12F629 PICs
> (more than 30)
> will be connected to a simple serial (like SPI) common bus.
> The total length of the bus can be more than 3..10m and the
> transmission
> rate will be relatiively low (say 1kbps).
> I am wondering what sort of bus drive IC would be recommended?
> I was thinking about 74126 or something like 40107.

I have used 74HC14 in a similar setup. I did use series resistors at the
outputs, and resistors and capacitors at the inputs.

I used the internal oscillator (in fact of a 16F819) and pulse-with
encoding to handle the clock differences.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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