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digital logic - Why does a 4-bit asynchronous counter need exactly 4 flip- flops? - Electrical Engineering Stack Exchange
How to design a synchronous counter using D-type flip-flops for getting the following sequence, 0-2-4-6-0 - Quora
AE&I: LESSON 20. Counters-Asynchronous and synchronous counter-decade counter-up down counter- ring and Johnson counter.
![flipflop - Why use JK Flip Flops in syncronous/asyncronous binary counters rather than D flip flops? - Electrical Engineering Stack Exchange flipflop - Why use JK Flip Flops in syncronous/asyncronous binary counters rather than D flip flops? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/1a92F.png)