Hi,
I am to interface an old TTL based device with
the PIC18f. The device has roughly 20 pins coming
from TTL based gates I have to read at a given time.
I did not know, but reading the PIC18f specs, some
of the GPIOs are CMOS Schmitt trigger input buffer in
digital IO mode. So I guess I have to translate the level,
from TTL to CMOS, because the TTL level may be too
low for the CMOS Schmitt trigger to switch correctly, I
am right?
In that case, do you know about a chip doing so?
Cheers,
Fabien.