MTBF Examples of Metastability.,

PLDs

Keep in mind that the table below is some what dated, I'm sure the newer FPGAs and PLD ICs have MTBF [Mean-Time-Between-Failure] numbers which far exceed the ones listed. Checking the Cypress site (8/05) I see that their faster version of a 22V10 IC is a dash five (5 nS).

Metastability characteristics of PLDs

Device	fmax (MHz)	W(fsec)	tsw(nsec)	tr(nsec) (10-year MTBF)
PALC16R8-25	28.5	9.503	0.515	14.68
PALC20G10-20	41.6	3.73	0.173	4.91
PALC20RA10-15	33.3	2.86	0.216	5.87
PALC22V10C-10	90.9	0.00808	0.547	13.0
PALC22V10B-15	50.0	55.76	0.261	8.19
PALC22V10-20	41.6	0.125	0.190	4.73
CY7C330-66	66.6	1.02	0.290	8.12
CY7C331-20	31.2	298.0	0.184	5.91
CY7C332-15	47.6	1.55	0.337	9.35
CY7C344-20	41.6	966.0	0.223	7.55

The Table data was copied from "Determine PLD metastability to derive ample MTBFs",
EDN August 5 1991, Author: Sean Dingman.