Ic 7490 Decade Counter Pin Diagram. It is an asynchronous decade counter ic. 74ls90 is basically a mod 10 decade counter that generate a bcd output code.
74ls90 also have an independent toggle jk flip flop by clka and other three are driven by the clkb. As it is a 4 bit binary decade counter it has 4 output ports qa qb qc and qd. Let s look at the 7490 briefly to see how it works.
This is pin diagram of cd4017 counter this 4017 counter ic is known as johnson counter ic.
The ic has the ability to start from 0 and end at 9 automatically. 74ls90 binary counter features it is used as a simple counter from 0 9. This is pin diagram of cd4017 counter this 4017 counter ic is known as johnson counter ic. It has 10 output.
