S/LS logic was introduced in the mid 70's, F/AS/ALS around 1980, HC was
early 80's. By the third 7400 generation (F/AS/ALS) the problem was
well known with parameters available and the logic fairly hard to it.
On 3/25/13 2:56 PM, Attila Kinali wrote:
On Mon, 25 Mar 2013 14:03:23 -0400
David McGaw <n1...@alum.dartmouth.org> wrote:
Actually, most modern FFs are hardened against metastability so often a
single synchronizer will do especially if it is feeding a synchronous
circuit.
I would not count on that. Most 74xx that hobbyists use are from
the HC and HCT families. These have been designed in the 70s (IIRC)
and i very much doubt that any of the manufacturers changed anything
in their design since then.
Attila Kinali
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