What is a logic comparator?
Scott Lemon
Hi
This is probably a question for sci.electronics.basic, but what is a logic
comparator? I understood it was a device that you could use to test logic
components in-circuit against another known good device.
How well do they work? Do you need to have 1,001 different modules for
different devices? What brands/models should I look for and
how expensive are they?
I'm asking because my knowledge of debugging digital logic circuits is
marginally greater than 0.
Thanks for any info!
Bill Sloman
The only sort of logic (by which I understand "digital") comparators I
know are parts like the 74HCT85 which compare two four-bit numbers,
and generate three outputs P<Q, P=Q, and P>Q, one and only one of which
is high.
For comparing components against a "known good" part, the 74HCT688 8-bit
magnitude comparator might be more interesting.It compares two 8-bit
numbers but only generates a single output which is low
if P=Q, and otherwise high
Bill Sloman (slo...@sci.kun.nl) | Precision analog design
TZ/Electronics, Science Faculty, | Fast analog design and layout
Nijmegen University, The Netherlands | Very fast digital design and layout