On Fri, 6 Dec 1996, Matt Ormsby wrote:

> I ran into a small problem with a circuit and was hoping for some help.  I
> have an output from another device of which runs 1.1 volts on to 0 volts
  ...
> supply on this board.  Does anyone have a way that I can get this output up
> to a good ttl level with a meg ohm input resistance or so?

Something like one section of an LM339 comparator would be perfect here.
It's designed for single-supply operation with an input range down to
ground and has an OC output.  There's a dual version in an 8-pin DIP,
though the boad space is about all you save, which is probably why I can
never remember the part number.  :-)

Or any other of the numerous op-amps or comparators that are designed and
spec'd for single-supply operation - it's a wildly popular market segment
these days, or at least you would think so based on the number of chips
being designed for it.  The 339 is a nice mature old part and is probably
more available and less expensive unless you need high speed or really low
power consumption.

Luck!