Hi Sean,

Using a comparator works too, and I can choose the input threshold. The
CD40109 has individual tristate for each buffer, so it's very versatile
without adding any parts. I'll just cross my fingers that TI sells
enough of them that in six to eight years they'll still be available.
That's the planned life cycle of this product.

Thanks for replying!

Bob

On Sun, Sep 21, 2014, at 08:25 AM, Sean Breheny wrote:
> What about using an open collector buffer like the 7407 or its more
> modern
> variants?
>=20
> On Thu, Sep 18, 2014 at 12:13 PM, Bob Blick <bobblick@ftml.net> wrote:
>=20
> > I'm worried now that TI is the only one making the CD40109 that soon
> > they will quit too.
> >
> > It's a low-to-high voltage translator and being old-style CMOS it works
> > from 3 to 15 volts.
> >
> > So I'm looking for equivalents. Don't need great power or speed. But I
> > do need 3.3 volts on the input and at least 8 volts on the output side.
> >
> > Thanks, Bob

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