[sdiy] unused comparators

[Magnus Danielson]

On 11/03/2013 04:55 AM, David G Dixon wrote:
> Yes (based on what Magnus says below), the more I think about it the more it
> seems dumb to ground the inputs of an unused comparator, since the output
> state will be indeterminate.  Better to connect the rails to the respective
> inputs, or one rail and ground at least, and to arrange it so that the input
> doesn't consume current.
Beware, railing them may not be a guarantee for stability. That is a
feature of a particular design. Another feature may be that the valid
input range may include the rail... such that railing both inputs is
just as dumb as grounding them. When you don't know better, park them at
distinct levels from each other!

Just did a quick search for "comparator rail to rail input" and found a
bunch of them.

Cheers,
Magnus