Users' questions

How can JK flip flop be used as a counter?

How can JK flip flop be used as a counter?

A binary counter can be constructed from J-K flip-flops by taking the output of one cell to the clock input of the next. The J and K inputs of each flip-flop are set to 1 to produce a toggle at each cycle of the clock input.

What is up and down counter?

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. Depending on the type of clock inputs, counters are of two types: asynchronous counters and synchronous counters.

Why JK flip flop is used in counters?

The significance of using JK flip flop is that it can toggle its state if both the inputs are high, depending on the clock pulse. So the synchronous counter will work with single clock signal and changes its state with each pulse. The output of first JK flip flop (Q) is connected to the input of second flip flop.

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.

What is the T flip-flop?

In T flip flop, “T” defines the term “Toggle”. In SR Flip Flop, we provide only a single input called “Toggle” or “Trigger” input to avoid an intermediate state occurrence. Now, this flip-flop work as a Toggle switch. The next output state is changed with the complement of the present state output.

What does a JK flip flop do?

A J-K flip-flop is nothing more than an S-R flip-flop with an added layer of feedback. This feedback selectively enables one of the two set/reset inputs so that they cannot both carry an active signal to the multivibrator circuit, thus eliminating the invalid condition.

Which flip-flop is used in counters?

Since there are only two states, a T-type flip-flop is ideal for use in frequency division and binary counter design. Binary ripple counters can be built using “Toggle” or “T-type flip-flops” by connecting the output of one to the clock input of the next.

How does JK flip-flop work?

The JK flip flop work as a T-type toggle flip flop when both of its inputs are set to 1. The JK flip flop is an improved clocked SR flip flop. But it still suffers from the “race” problem. This problem occurs when the state of the output Q is changed before the clock input’s timing pulse has time to go “Off”.

What is D flip flop?

Glossary Term: D Flip-Flop Definition. A D (or Delay) Flip Flop (Figure 1) is a digital electronic circuit used to delay the change of state of its output signal (Q) until the next rising edge of a clock timing input signal occurs.

Why is it called T flip-flop?

In SR Flip Flop, we provide only a single input called “Toggle” or “Trigger” input to avoid an intermediate state occurrence. This single input is called T. In simple words, we can construct the “T Flip Flop” by converting a “JK Flip Flop”. Sometimes the “T Flip Flop” is referred to as single input “JK Flip Flop”.

How to create a synchronous counter using flip flops?

For this project, I will show how to design a synchronous counter which is capable of storing data and counting either up or down, based on input, using either D flip-flops or J-K flip-flops. Specifically, the counter will count up: 0, 1, 2, 3, 0, 1, 2, 3, … when the input x = 1, and count down when the input x = 0.

When is JK flip flop in Reset mode?

JK flip-flop is in holding mode and toggle mode when the JK inputs are 00 and 11 respectively. If JK inputs are 01, JK flip-flop is in reset mode, while the inputs are 10, JK flip-flop is in set mode. It behaves almost like SR flip-flop but JK flip-flop has toggle mode.

Is there a state table for JK flip flop?

This state table does not follow the sequence from low (000) to high (111) but it does follow with the description function of count-down function. It might lead to mistakes when constructing Kmap. In order to do that, the characteristic of JK flip-flop must be completely comprehended.

Which is the correct JK input for the down counter?

Hence, the J input must be “0” and K input must be “d” (don’t care) in the excitation table. JK inputs are “d””1” for the transition from 1 to 0 because of row 2 & 4 of JK characteristic table.