In a 4-bit up-down counter, there are 4 J-K flip-flops required. For modulus-10 counter, N = 10. Therefore, 2
3
< = 10 < = 2
4
. Thus, n = 4, and therefore, we require
4 FFs
.
What is 4-bit up down counter?
Synchronous 4-Bit Up/Down Counter with Mode Control. General Description. The DM74LS191 circuit is a synchronous, reversible, up/ down counter. Synchronous operation is provided by hav- ing all flip-flops clocked simultaneously, so that the outputs change simultaneously when so instructed by the steering logic.
How does a 4-bit up 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.
How many years are required for 4-bit up down counter?
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. 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 2
4
= 16 states. Explanation: IC 7493 consist of 4 J-K master-slave flip-flop.
How many different states does a 4-bit synchronous counter have?
Therefore, in a 4-bit counter, the total number of states = 2
4
=
16 states
. Explanation: A ripple counter is something that is derived by other flip-flops.
How does a 4-bit asynchronous counter work?
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 many gates are needed for a 3 bit up counter?
The 3-bit Synchronous binary up counter contains three T flip-flops &
one 2-input AND gate
.
What is the maximum modulus of a 4-bit counter?
| 54. A 4-bit counter has a maximum modulus of ________. | A. 3 B. 6 C . 8 D. 16 Answer: Option D Explanation: No answer description available for this question. Let us discuss. Workspace Report errors … Name : Email: View Answer Discuss |
|---|
What is difference between up and down counter?
An up-counter counts
events in increasing order
. A down-counter counts stuff in the decreasing order. An up-down counter is a combination of an up-counter and a down-counter. It can count in both directions, increasing as well as decreasing.
What is register explain 4-bit shift register?
The Shift Register. The Shift Register is
another type of sequential logic circuit
that can be used for the storage or the transfer of binary data. This sequential device loads the data present on its inputs and then moves or “shifts” it to its output once every clock cycle, hence the name Shift Register.
How do you create a 4-bit synchronous counter?
4 bit Synchronous UP Counter. The 4 bit up counter shown in below diagram is designed by using
JK flip flop
. External clock pulse is connected to all the flip flops in parallel. For designing the counters JK flip flop is preferred .
How many flip-flops are needed for Mod 10 Johnson counter?
Counting Sequence of Decade counter
A decade counter is called as mod -10 or divide by 10 counter. It counts from 0 to 9 and again reset to 0. It counts in natural binary sequence. Here
4 T Flip flops
are used.
What is synchronous 3 bit up down counter?
Synchronous 3-bit Up/Down Counter
Then the 3-Bit counter advances
upward in sequence
(0,1,2,3,4,5,6,7) or downwards in reverse sequence (7,6,5,4,3,2,1,0). Generally most bidirectional counter chips can be made to change their count direction either up or down at any point within their counting sequence.
What is the maximum counting speed of a 4-bit binary counter which is composed of flip flops with a propagation delay of 25ns?
| Que. What is the maximum counting speed of a 4-bit binary counter which is composed of Flip-Flop with a propagation delay of 25ns? | b. 10 MHz | c. 100 MHz | d. 4 MHz | Answer:10 MHz |
|---|
How do you make a 3 bit synchronous counter?
- Decide the number and type of FF – …
- Write excitation table of Flip Flop – …
- Decision for Mode control input M – …
- Draw the state transition diagram and circuit excitation table – …
- Circuit excitation table – …
- Find a simplified equation using k map – …
- Create a circuit diagram –
What is asynchronous down counter?
In the asynchronous counter,
an external clock pulse is provided
for only the first flip flop, thereafter the output of the 1st FF acts as a clock pulse for the second FF and so on. In the case of synchronous FFs, all the flip flops are triggered simultaneously by an external clock pulse.
How many gates are needed for a 3 bit up counter using standard binary and using T lip lops?
| Q. 4: How many gates (minimum) are needed for a 3-bit up-counter using standard binary and using T lip-lops ? Assume unlimited fan-in. | B. 3 | C. 2 | D. 1 | Answer» c. 2 |
|---|
Which of the following is a correct sequence for MOD 4 counter?
MOD-4 Counter
The overall effect would be to divide the original clock input signal by four. Then the binary sequence for this 2-bit MOD-4 counter would be:
00, 01, 10, and 11
as shown.
What is a 4-bit binary up counter explain with complete diagram?
| Signal Type Description | BINARY/ DECADE Input Binary or Decade counting mode. | CARRY IN Input Counter “carry in” input. | CARRY OUT Output Counter “carry out” output. | PRESET ENABLE INPUT Enable the jam inputs. |
|---|
What is the terminal count of a 4-bit binary counter in the up mode and in the down mode What is the next state after the terminal count in the down mode?
What is the terminal count of a 4-bit binary counter in up-mode and down-mode? The terminal count of a 4-bit binary counter in up-mode is
1111, and 0000 in down-mode
.
How high can you count with 4 bits?
A block of 4 bits is called a nibble (half a byte!) and it can hold a maximum
number of 1111 = 15 in decimal
. Many counting circuits work with blocks of 4 bits because this number of bits is required to count up to 9 in decimal.
What is the modulus of 5 bit ripple counter?
Explanation: The minimum number of flip-flops used in a counter is given by: 2
( n – 1 )
<=N<=2
n
. Thus, for modulus-5 counter:
2
2
<= N <= 2
3
, where N = 5 and n = 3
. Explanation: There are 10 states, out of which MSB is high only for (1000, 1001) 2 times.
How many flip flops are needed for a mod 32 binary counter?
For a mod 32 counter, 32=2^5. So
5 flip-flops
are required.
What is 2-bit counter?
input: A 2-bit number that
will be used to load a value into the counter
. up/down: This indicates if the counter will be counting up or counting down. If this signal is high, the counter should count down. If the signal is low, the counter should count up.
What is 2-bit asynchronous counter?
An asynchronous counter is one in which the flip-flops within
the counter do
not change states at exactly the same time because they do not have a common clock pulse. Operation: A 2-Bit Asynchronous Binary Counter Fig1-1 shows a 2-bit counter connected for asynchronous operation.
How many flip flops are required for an bit Johnson counter?
Like Ring counter,
four D flip flops
are used in the 4-bit Johnson counter, and the same clock pulse is passed to all the input of the flip flops.
How many flip flops are required for Mod 12 Johnson counter?
The MOD of the Johnson counter is 2n if n flip-flops are used. So 12 cycles need
6 FF
only.
How does a up-down counter work?
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.
How do I calculate how many flip flops I need?
Example 1: How many flip flops are needed to implement a state machine with 12 states? Answer: 3 flip flops can implement 23=8 states and 4 can implement 24=16. Since 8 states are too few, 4 flip flops would be needed to cover 12 states.
