[time-nuts] 74HC390 Dividers

[Brian Kirby]

I had shown some previous data on 74HC390 dividers (10 Mhz input and 
using them to generate 5 Mhz, 1 Mhz, and 1 PPS) and John had asked about 
some longer term data.

So here it is, 100K ADEV with the 5370B on internal clock

Mean nS, Min nS, Max nS,  STD pS
77.3434   76.82   77.83   213
76.9330   75.53   78.75   1000  (temp dropped from 72 to 50 degrees F)
76.4866   74.57   77.42   614 (brought temp back up to 72 degrees F)
76.8918   76.50    77.36   136
76.6724   76.33   77.09    149
75.9256   75.45   76.39   187 (restart - power failure)
75.8951   75.41   76.29   146
75.9744   75.64   76.31   98.1
75.8360   75.37   76.66   215
75.8356   75.33   76.25   168
75.9557   75.59   76.45   152
76.0029   75.45   76.41   159
75.7823   75.18   76.46   274
75.3876   74.55   76.60   455 (temp change, ran off UPS for 6 hours 
during power failure)
75.1206   74.55   75.80   237
74.9616   74.45   75.51   204
74.8877   74.37   75.43   200
74.8367   74.39   75.47   186
74.8324   74.36   75.39   183
75.0442   74.41   76.17   378 (temp to 45F at night, to 80F in day, 
inside A/C turned off)
74.8725   74.39   75.62   219
74.5939   73.85   75.61   333
74.3250   74.00   74.82   144
74.3062   73.89   74.79   132
74.1885   73.75   74.65   167
74.0325   73.14   74.63   369 (no A/C again)
74.2630   73.48   74.65   195
74.2611   73.34   74.79   246

and I quit recording - I am going on vacation...

When I get back, I will start another identical test on another 
identical divider.

Brian KD4FM