What is 4-bit synchronous up counter?
4- Bit Synchronous Up Counter An external CLK signal is given to all four flip-flops in parallel. This counter includes 16 output states where it counts from 0000 to 1111. As compared to 3-bit, the timing diagram of this counter & its operation is also the same.
What is 4-bit up-down counter?
Normally the counter increments the 4 bit word (Q4,Q3,Q2,Q1) by one every time the clock input is toggled. If the UP/DOWN input is asserted the counter counts down (subtracts one) upon each clock cycle instead. The CARRY OUT and CARRY IN signals are used when more than one counter are used “in cascade”.
What is 4-bit up-down counter how many flip-flops are required?
4 J-K flip-flops
In a 4-bit up-down counter, there are 4 J-K flip-flops required. For modulus-10 counter, N = 10.
Which one is a 4-bit binary ripple counter *?
Which one is a 4-bit binary ripple counter? Explanation: IC 7493 is a 4-bit binary ripple counter. It is a MOD-16 counter with 24 = 16 states. Explanation: IC 7493 consist of 4 J-K master-slave flip-flop.
What is binary synchronous counter?
Synchronous Counter: It is a digital circuit that performs counting in binary numbers with the help of flip-flops and all flip-flops triggered simultaneously.
How 4 bits up counter works explain?
In the asynchronous 4- bit up counter, the flip flops are connected in toggle mode, so when the when the clock input is connected to first flip flop FF0, then its output after one clock pulse will become 20. The rising edge of the Q output of each flip flop triggers the clock input of its next flip flop.
How does a 4-bit counter work?
A 4-bit Synchronous up counter start to count from 0 (0000 in binary) and increment or count upwards to 15 (1111 in binary) and then start new counting cycle by getting reset. Its operating frequency is much higher than the same range Asynchronous counter.
What is synchronous up down counter?
4 bit Synchronous Up/Down Counter The up/ down counter has “Up” and “Down” count modes by having 2 input AND gates, which are used to detect the appropriate bit conditions for counting operation. OR gates are used to combine the outputs of AND gate, from each JK flip flop.
What is a synchronous and asynchronous counter?
Synchronous counter is the one in which all the flip flops are clocked simultaneously with the similar clock input. On the contrary, an asynchronous counter is a device in which all the flip flops that constitute that counter are clocked with different input signals at different instants of time.
Which counter is called Johnson counter?
Twisted Ring Counter
A Johnson counter is a modified ring counter in which the output from the last flip flop is inverted and fed back as an input to the first. It is also called as Inverse Feedback Counter or Twisted Ring Counter.
How 4-bit counter works?
What is up down synchronous counter?
Counters are used in many different applications. Some count up from zero and provide a change in state of output upon reaching a predetermined value; others count down from a preset value to zero to provide an output state change. The counters are synchronous, but they are asynchronously presettable.
How to construct a 4-bit synchronous down counter?
Therefore, this type of counter is also known as a 4-bit Synchronous Up Counter. However, we can easily construct a 4-bit Synchronous Down Counter by connecting the AND gates to the Q output of the flip-flops as shown to produce a waveform timing diagram the reverse of the above.
How to design a synchronous up counter?
Step 1: To design a synchronous up counter, first we need to know what number of flip flops are required. we can find out by considering a number of bits mentioned in the question. So, in this, we required to make 4 bit counter so the number of flip flops required is 4 [2 n where n is a number of bits].
How to design a 4 Bit synchronous up counter using T flip flop?
Design a 4 bit synchronous up counter using T flip flop Step 1: To design a synchronous up counter, first we need to know what number of flip flops are required. we can find… Step 2: After that, we need to construct a state table with excitation table. Note: To construct excitation table from…
What is the propagation delay of a synchronous counter?
With all clock inputs wired together there is no inherent propagation delay. Synchronous counters are sometimes called parallel counters as the clock is fed in parallel to all flip-flops. The inherent memory circuit keeps track of the counters present state. The count sequence is controlled using logic gates.