Experiment 11 - Synchronous 4-bit Counter

How do you build a functioning synchronous 4-bit counter? In addition to a chain of flip-flops from the last experiment, you need some additional logic elements...

Consider the circuit diagram. You easily recognize the "false" synchronous 4-bit counter, which has been extended by two AND gates...

Circuit diagram 4-bit synchronous counter.

Illustration states of a 4-bit synchronous counter.

The circuit counts correctly...!

Circuit 4-bit synchronous counter. (Enlarge)

In the next step you extend this concept of a synchronous counter...