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Referring to the datasheet for the 7490 decade counter IC, draw a circuit that shows how...

Referring to the datasheet for the 7490 decade counter IC, draw a circuit that shows how a single 7490 IC can be used as a divide-by-5 counter.

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Answer #1

7490 Divide-by-5 Counter:-
Note that with this divide-by-5 counter configuration, the output waveform is not symmetrical but has a 4:1 mark-space ratio. That is four input clock signals creates a LOW or logic “0” output and the fifth input clock signal produces a HIGH or logic “1” output.

To produce a divide-by-10 BCD decade counter, both internal counter circuits are used giving a 2 times 5 divide-by value. Since the first output QA from flip-flop “A” is not internally connected to the succeeding stages, the counter can be extended to form a 4-bit BCD counter by connecting this QA output to the CLKB input as shown.

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