![]() ![]() It counts from 0 to 9.When the clock pulse advances to 10 the ports QB and QD become high and thus NAND gate’s output will become low which will reset all the flip flops. Decade or BCD counter : A binary coded decimal (BCD) is a serial digital counter that counts ten digits.A 3-bit ripple counter can count up to 8 states.It counts down from 7 to 0. It counts from 0 to 7.ģ bit ripple down counter: It contains three flip flops. A 3-bit ripple counter can count up to 8 states. ![]() It is known as down counter as it counts down from 3 to 0.ģ bit ripple up counter: It contains three flip flops. A 2-bit ripple counter can count up to 4 states. 2 bit ripple down counter: It contains two flip flops.2 bit ripple up counter: It contains two flip flops.The flip-flop applied with external clock pulse act as LSB (Least Significant Bit) in the counting sequence.The flip-flop toggles the output either for every positive edge of clock signal or for negative edge of clock signal. It is known as ripple counter because of the way the clock pulse ripples its way through the flip-flops. The logic diagram of a 2-bit ripple up counter is shown in figure.īut you can use the JK flip-flop also with J and K connected permanently to logic 1.Įxternal clock is applied to the clock input of flip-flop A and QA output is applied to the clock input of the next flip-flop i.e. It is a group of flip-flops with a clock signal applied. Counter is the widest application of flip-flops. A digital circuit which is used for a counting pulses is known counter. This site uses Just the Docs, a documentation theme for Jekyll.Ĭounter is a sequential circuit.
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