How many FF are required for 4-bit up down counter?
In 4-bit up-down counter, how many flip-flops are required? Explanation: An n-bit bit counter requires n number of FFs. In a 4-bit up-down counter, there are 4 J-K flip-flops required.
How do you make a 4-bit synchronous counter?
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 4-bit up down counter?
The SN74HC193 device is a 4-bit synchronous, reversible, up/down binary counter. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change simultaneously with each other when dictated by the steering logic.
How does a 4-bit counter work?
A 4-bit down counter is a digital counter circuit, which provides a binary countdown from binary 1111 to 0000. This circuit uses four D-type flip-flops, which are positive edge triggered. At each stage, the flip-flop feeds its inverted output (/Q) back into its own data input (D).
How up counter can be converted to down counter?
To convert the up counter in Fig. 5.6. 1 to count DOWN instead, is simply a matter of modifying the connections between the flip-flops. By taking both the output lines and the CK pulse for the next flip-flop in sequence from the Q output as shown in Fig.
Which is faster synchronous or asynchronous counter?
1. In synchronous counter, all flip flops are triggered with same clock simultaneously. In asynchronous counter, different flip flops are triggered with different clock, not simultaneously. Synchronous Counter is faster than asynchronous counter in operation.
What is the advantage of synchronous counter?
The one advantage of synchronous counter over asynchronous counter is, it can operate on higher frequency than asynchronous counter as it does not have cumulative delay because of same clock is given to each flip flop.
What is difference between synchronous and asynchronous counters?
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.
How many types of asynchronous counters are there?
two types
How many types of counters are there?
Why asynchronous counter is called ripple counter?
Asynchronous counters are sometimes called ripple counters because the data appears to “ripple” from the output of one flip-flop to the input of the next. They can be implemented using “divide-by-n” counter circuits. Truncated counters can produce any modulus number count.
Where is the ripple counter used?
It can also be used for Frequency divider, time measurement, frequency measurement, distance measurement and also for generating square waveforms. In this, the flip-flops are asynchronous counters and are supplied with different clock signals, there may be a delay in producing output.
What are the drawbacks of ripple counter?
Ripple CountersEdit They are called ripple counters because the new count ripples through them. The major disadvantage of ripple counters is that because of new count “rippling” through the flip flops all the bits of the count arrive at different times.
What is the difference between 7490 and 7493?
1. What is the difference between a 7490 and a 7493? Explanation: The difference between a 7490 and a 7493 is that 7490 is a MOD-10, 7493 is a MOD-16 counter. Thus, 7490 traverses 10 states and 7493 traverses 16 states.
What is the difference between a ring shift counter and a Johnson shift counter?
The difference between a ring counter and a Johnson counter is which output of the last stage is fed back (Q or Q’). Recirculating a single 1 around a ring counter divides the input clock by a factor equal to the number of stages. Whereas, a Johnson counter divides by a factor equal to twice the number of stages.
Which shift register counter requires the most decoding circuitry?
Ripple counter
Can shift register be used as a counter?
Shift registers are also used as counters. There are two types of counters based on the type of output from right most D flip-flop is connected to the serial input. Those are Ring counter and Johnson Ring counter.
What is the present condition for ring shift counter?
Explanation: A ring shift counter is a counter in which the output of one FF connected to the input of the adjacent FF. In preset condition, all of the bits are 0 except first one. Explanation: There is no such type of register present who doesn’t have output end.
What is the mod value of 3 bit twisted ring counter?
When CLK=5, the output of the counter is 001. The MOD of the 3-bit johnson counter is 6.
Which shift register is fastest?
The serial input and last output of a shift register can also be connected to create a “circular shift register”. A PIPO register (parallel in, parallel out) is very fast – an output is given within a single clock pulse.
How many flip flops are required for the design of 2 bit synchronous counter?
Synchronous BCD Counter – The counter counts BCD numbers 0 (0000) to 9 (1001). Since BCD numbers are 4-bit long, four flip flops are required to design the BCD counter. The Synchronous BCD counter has all the flip flops sharing a common clock pulse.
How many flip-flops are required to make a counter which counts from 0 to 10?
4 flip
What is a 3 bit asynchronous counter?
The 3-bit Asynchronous binary up counter contains three T flip-flops and the T-input of all the flip-flops are connected to ‘1’. So, the output of first T flip-flop toggles for every negative edge of clock signal. The output of first T flip-flop is applied as clock signal for second T flip-flop.
Which flip flop is used in case of register designing?
A simple Shift Register can be made using only D-type flip-Flops, one flip-Flop for each data bit. The output from each flip-Flop is connected to the D input of the flip-flop at its right. Shift registers hold the data in their memory which is moved or “shifted” to their required positions on each clock pulse.
Is a flip flop a register?
Flip-flop is a 1 bit memory cell which can be used for storing the digital data. To increase the storage capacity in terms of number of bits, we have to use a group of flip-flop. Such a group of flip-flop is known as a Register.