[time-nuts] GPS lock of the FE5680. Current experiment and question

[David]

On Fri, 10 Feb 2012 18:19:53 -0800, Hal Murray
<hmurray at megapathdsl.net> wrote:

>> Flip-flops hardened against metastability are available.
>
>Do you have a part number in mind?

Some logic families are better than others.  In general you want
faster ones with shorter setup and hold times.

On Semiconductor has an interesting application note with some test
data.

http://www.onsemi.com/pub_link/Collateral/AN1504-D.PDF

National mentions "metastable hardened" in this 74HCT74 data sheet.
Notice the guaranteed worst case propagation delays:

http://eshop.engineering.uiowa.edu/NI/pdfs/00/53/DS005360.pdf