Hello again,
Hopefully I don't irritate anyone with these "newbie" questions (is
there a FAQ I should check?), but I really want to cover all basis
before putting my new ts7260 to work.
This question has to do with interfacing the 3.3V DIO lines to
external circuits. How do you folks usually do this? When using a
line for output, I'm assuming it is okay to feed directly to TTL or
CMOS ICs (even if they have 5V Vcc) since 3.3V is logic HIGH for
TTL. Are there any precautions (current requirements for TTL inputs,
etc.) I need to be aware of? I'm entertaining the use of buffers as
an extra precaution... The last thing I want to do is burn out my
SBC.
When using DIO lines for inputs, what is the recommendation there?
Should I use CMOS buffers (with TTL inputs) running at 3.3V Vcc? Is
it really the voltage that's the issue, or the current? In other
words, if I place a resistor between a TTL output and the DIO line,
will that do the trick? I rather not over complicate things, but I'm
sure there are many good ways to interface a 3.3V IO with 5V or even
12V IO.
Thanks for any suggestions / tips!
Mike
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