From: Spiro Trikaliotis (trik-news_at_gmx.de)
Date: 2002-12-10 07:29:18
Hello Nick,
Nick Coplin wrote:
> Seems most new LSI technology is going to 3.3V designs (eg CPLDs etc). Most
> are input tolerant for 5V, but how does one interface their outputs? Does a
> simple pull-up resistor to 5V do the trick?
as CMOS can run with a Vcc in the range of 3V to 15V, I think that a CMOS
buffer should do the trick. Since the 4049 or 4050 is very tolerant of
the input, so you can use it to interface higher voltages than its Vcc,
I'm used to use them as buffer. In your case, these should do the trick,
at least the HCT types (74HCT4049, 74HCT4050), although I never tested it.
HTH,
Spiro.
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