HD74LS390 Dual Decade Counters REJ03D0485-0400 Rev.
4.
00 May 10, 2006 This circuit contains eight master-slave flip-flops and additional gating to implement two individual four-bit counters.
The HD74LS390 incorporates dual divide-by-two and divide-by-five counters, which can be used to implement cycle lengths equal to any whole and / or cumulative multiples of 2 and / or 5 up to divide-by-100.
When connected as a biquinary counter, the separate divide-by-two circuit can be used to provide symmetry (a square wave) at the final output stage.
Features • Ordering Information Part Name Package Type Package Code (Previous Code) Package Abbreviation HD74LS390P DILP-16 pin PRDP0016AE-B (DP...

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