The number of parameters recorded, the interval and the resolution are in function of year of production.
For a 1997 made:
CFR 14 §121.344 Digital flight data recorders for transport category airplanes:
(d) For all turbine-engine-powered transport category airplanes that were manufactured after October 11, 1991—
(1) The parameters listed in paragraph (a)(1) through (a)(34) of this section must be recorded within the ranges, accuracies, resolutions, and recording intervals specified in Appendix M
There are some parameters with interval below 1 second, as g factors and flight controls position, in
Appendix M