3 Bit Synchronous Up Counter Circuit Diagram. Ordinarily three flip flops would be used one for each binary bit but in this case we can use the clock pulse 555 timer output as a bit of its own. Circuit and operation of synchronous counter here the figure below shows a 3 bit synchronous counter.
And the clock signal to trigger the flip flop is provided at the same time. Circuit and operation of synchronous counter here the figure below shows a 3 bit synchronous counter. Synchronous counter timing diagram in the above image clock input across flip flops and the output timing diagram is shown.
And the clock signal to trigger the flip flop is provided at the same time.
All these flip flops are negative edge triggered and the outputs of flip flops change a f f e c t synchronously. To make a synchronous down counter we need to build the circuit to recognize the appropriate bit patterns predicting each toggle state while counting down. In a sense this circuit cheats by using only two j k flip flops to make a three bit binary counter. And the clock signal to trigger the flip flop is provided at the same time.
