Re: Missing Schmitt Gates??
- From: James Arthur <dagmargoodboat@xxxxxxxxx>
- Date: Fri, 30 Nov 2007 15:03:05 -0800 (PST)
On Nov 30, 1:37 pm, Joerg <notthisjoerg...@xxxxxxxxxxxxxxxxxxxxx>
wrote:
James Arthur wrote:
a) I think some of the 74hc buffers may have had Schmitt inputs
(74hc244?). If not, Fairchild's TinyLogic buffers do: NC7WZ17.
b) the single-gate programmable parts NC7SZ57, NC7SZ58 have Schmitt
inputs. Make whatever you want!
or
Brings up a question: I've only see those from Fairchild and
single-source always make me uncomfortable. Is there anything FFF
compatible from others?
FFF ?
There are a bunch of families and vendors of tiny single- double-
and triple-gate SMD products. It's dizzying. I'm skeptical that so
many are needed and economically viable, so I too would be cautious
about depending on the exact characteristics of any given part.
OTOH, there are so many pin-compatible substitutions that a generic
requirement shouldn't be that difficult to replace--if not outright
2nd source--methinks.
Fairchild, OnSemi, TI, NXP, and Toshiba all make parts, off the top
of my head.
c) make your own, as Frank suggested. That's what I did as an early
user of 74hc, before Schmitt-trigger parts were available.
Then there's always the roll-your-own approach if you can tolerate
the effects of feedback delay. Many times you just want an
oscillator, or to keep the thing from staying linear & wasting power.
Cheers,
James Arthur
.
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