Synchronous Up Down Counter Circuit Diagram. Whereas for the up down counter you can use multiplexers as switches as we saw in the design of the 3 bit synchronous up down counter. The series of the table shows.
3 bit synchronous up counter. A combinational circuit is required to be designed and used between each pair of flip flop in order to achieve the up down operation. Synchronous up counter counts the number of clock pulses at its input from minimum to maximum.
Synchronous binary down counter.
In the up down ripple counter all the ffs operate in the toggle mode. If the up down control line is made low the bottom and gates become enabled and the circuit functions identically to the second down. If the up down control line is set to low then the bottom and gates are in enable state and the circuit acts as down counter. A combinational circuit is required to be designed and used between each pair of flip flop in order to achieve the up down operation.
