## What is 3 bit synchronous counter?

The 3-bit Synchronous binary up counter contains three T flip-flops & one 2-input AND gate. All these flip-flops are negative edge triggered and the outputs of flip-flops change affect synchronously. The T inputs of first, second and third flip-flops are 1, Q0 & Q1Q0 respectively.

## How many flipflops are required to built a binary counter to count from 0 to 1023 What is the MOD number?

Each flip flop has two states, on or off on in the binary number system represents the values 0 or 1. Ten flip flops will therefore give you 1024 different values, 0 to 1023. To get to 1024 you will need 11 flip flops.

**How does a ripple counter work?**

Ripple counter is a special type of Asynchronous counter in which the clock pulse ripples through the circuit. The n-MOD ripple counter forms by combining n number of flip-flops. The n-MOD ripple counter can count 2n states, and then the counter resets to its initial value.

### What is 4 bit asynchronous up counter?

Asynchronous 4-bit UP counter. A 4 bit asynchronous UP counter with D flip flop is shown in above diagram. It is capable of counting numbers from 0 to 15. The clock inputs of all flip flops are cascaded and the D input (DATA input) of each flip flop is connected to a state output of the flip flop.

### What is difference between up counter 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 4-bit counter?**

A 4-bit down counter is a digital counter circuit, which provides a binary countdown from binary 1111 to 0000. This type of circuit operates in an asynchronous (ripple) manner because the flip-flop stages do not rely on a common clock pulse for timing.

4 FFs

2-bit Synchronous up counter The JA and KA inputs of FF-A are tied to logic 1. So FF-A will work as a toggle flip-flop. The JB and KB inputs are connected to QA.

**What is a mod 6 counter?**

A modulo 6 (MOD-6) counter circuit, known as divide-by-6 counter, can be made using three D-type flip-flops. The circuit design is such that the counter counts from 0 to 5, and then on the 6th count it automatically resets to begin the count again.

## What is mod of a counter?

The number of different output states a counter can produce is called the modulo or modulus of the counter. The Modulus (or MOD-number) of a counter is the total number of unique states it passes through in one complete counting cycle with a mod-n counter being described also as a divide-by-n counter.

## How many flip flops are needed for a mod 32 binary counter?

5 flip

**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.

### Is Johnson counter asynchronous?

Johnson counter also known as creeping counter, is an example of synchronous counter. In Johnson counter, the complemented output of last flip flop is connected to input of first flip flop and to implement n-bit Johnson counter we require n flip-flop.It is one of the most important type of shift register counter.

### How many distinct States does 4 bit ring counter have?

4 states

**What is the difference between Johnson counter and ring 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.

Applications of Ring counters

A straight ring counter, also known as a one-hot counter, connects the output of the last shift register to the first shift register input and circulates a single one (or zero) bit around the ring.

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