Re: Missing Schmitt Gates??

On Sat, 01 Dec 2007 02:10:05 GMT, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:

James Arthur wrote:
On Nov 30, 3:13 pm, Joerg <notthisjoerg...@xxxxxxxxxxxxxxxxxxxxx>
wrote:
James Arthur wrote:
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 ?
Form - Fit - Function.

Purchasing speak for a real drop-in replacement.

SN74AUP1G57 is darn close...
http://focus.ti.com/docs/prod/folders/print/sn74aup1g57.html

TI's Little Logic(tm) offerings overview here:
http://focus.ti.com/lit/ml/scyb025/scyb025.pdf

Selection guide here:
http://focus.ti.com/lit/ml/scyt129b/scyt129b.pdf)

NXP makes them too:
http://www.nxp.com/acrobat/datasheets/74AUP1G57_1.pdf


Thanks! I didn't know this stuff was so popular.

We love these things. Since most logic is migrating to fpga's, once in
a while you need a single gate or flipflop. The tinies can often run
from 5 volts (which fpga's can't any more) and some are blindingly
fast, like flipflops with 1 ns prop delays or buffers with 600 ps
rise/fall times. And - you'll like this - they're CHEAP!

We often put tiny logic schmitts right at an fpga to buffer incoming
clocks, especially when there's any doubt about signal integrity. Or
make clock trees. Works miracles.

Tiny schmitts can do analog-like stuff, too, like being the basis for
a boost regulator, or acting as a frequency-counter front end.

Relay and led drivers, too.

John



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