Q 2 = 1, when in its previous state the OR of Q 1 & Q 0 is equal to Q 2. Q 1 = 1, when its previous state Q 1 &Q 0 are equal & Q 1 = 0, when its previous state Q 1 &Q 0 are not equal. Because it will toggle the state whenever a clock pulse hits the FF 0. Q 0 is continuously changing so the input to FF 0 will be D 0 = Q̅ 0. This implies that all the flip-flops update its value at the same time.Īccording to the state table of down-counter their clock inputs are connected together and are triggered by the same external clock signal. What is Synchronous Counter?Īs the name implies, the synchronous counter contains flip-flops which are all in sync with each other i.e. So this counter can also be modified into a timepiece given the clock signal has a time period of 1 second. The time period of clock signal will affect time delay in the counter. So the counter will count up or down using these pulses. Digital counters mainly use flip-flops and some combinational circuits for special features.Īs we know flip-flop operates on clock pulses. Advantages / Disadvantages of Synchronous CountersĪ digital binary counter is a device used for counting binary numbers.
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