74AC logic would do it just fine, but needs 5V nominal for full-speed
specs. Lower supply voltage should work, but probably not all the way
down to 3.3V with 50 MHz clocking. The spec sheets should indicate the
possible range.
The 74AC390 can provide divide by 5 directly, with another divide 5 and
two divide 2 sections left over - lots of capability.
Ed
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