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Thread: Pin won't turn off properly
www.piclist.com/techref/ubicom/devices.htm?key=sx
picon face BY : Brian Aase email (remove spam text)



> I too have had timing problems with the Philips 74HC123 parts.  The
> Philips part produced a significantly shorter pulse than Fairchild's
> part.  We use the part for a long pulse (30 seconds or so) and by
> using much larger capacitors could still only get to about 26 seconds.

IIRC, several manufacturers include a cautionary statement in their
data sheets, to the effect that 74xx123 parts are not sutiable for
delays > 1 second.

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