Synchronous Counters

Different types of Synchronous Counters

<ul class="i8Z77e"><li class="TrT0Xe">Binary counters.</li><li class="TrT0Xe">4 bit synchronous UP counter.</li><li class="TrT0Xe">4 bit synchronous DOWN counter.</li><li class="TrT0Xe">4 bit synchronous UP / DOWN counter.</li><li class="TrT0Xe">Loadable counters.</li><li class="TrT0Xe">BCD counters.</li><li class="TrT0Xe">Ring counters.</li><li class="TrT0Xe">Johnson counters etc.</li></ul>

Where is synchronous counter used?

Some common uses and application of synchronous counters are follow: Alarm Clock, Set AC Timer, Set time in camera to take the picture, flashing light indicator in automobiles, car parking control etc. Counting the time allotted for special process or event by the scheduler.

What is synchronous counter and asynchronous counter?

1. In the synchronous counter there are continuous clock input signals with flip-flops used to produce the output. In Asynchronous counters there are different clock signals used to produce the output. 2.

Why do we use 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 synchronous counter and example?

S.NO	Synchronous Counter
5.	Synchronous Counter designing as well implementation are complex due to increasing the number of states.
6.	Synchronous Counter will operate in any desired count sequence.
7.	Synchronous Counter examples are: Ring counter, Johnson counter.

What is 3 bit synchronous counter?

A synchronous counter is one whose output bits change state simultaneously, with no ripple. In these types of counters, the flip flops are clocked at the same time by a common clock pulse. Thus, all the flip flops change state simultaneously (in parallel). It advances upward in sequence (0, 1, 2, 3, 4, 5, 6, 7).

Which flip-flop is used in synchronous counter?

Let's discuss it one by one. Overview : Toggle or D-type flip-flops can be used to make synchronous counters, and It is easy to design than asynchronous counters. Due to the clock input of flip-flops are all clocked together and with the same clock signal at the same time, that's why it is called synchronous counters.

What is BCD counter?

A BCD counter is a special type of a digital counter which can count to ten on the application of a clock signal. Advertisement. We saw previously that toggle T-type flip flops can be used as individual divide-by-two counters.

Which flip-flop is used as counter?

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.

What is the difference between synchronous and asynchronous?

The key difference between synchronous and asynchronous communication is synchronous communications are scheduled, real-time interactions by phone, video, or in-person. Asynchronous communication happens on your own time and doesn't need scheduling.

What are types of counters?

Counters are of two types. Asynchronous or ripple counters. Synchronous counters.

Is ripple counter asynchronous?

Some of the features of ripple counter are: It is an asynchronous counter. Different flip-flops are used with a different clock pulse. All the flip-flops are used in toggle mode.

How do synchronous counters work?

Synchronous Counters use edge-triggered flip-flops that change states on either the “positive-edge” (rising edge) or the “negative-edge” (falling edge) of the clock pulse on the control input resulting in one single count when the clock input changes state.

What is 2 bit synchronous counter?

A Two-bit synchronous counter designed by using two reversible JK Flip flop and two Feynman gate. The clock input is given to Feynman gate; Feynman gate output is connected to another Feynman gate as input and also joined to reversible JK flipflop as clock input.

What is synchronous flip-flop?

In a synchronous circuit, flip-flops are used as the basic memory element, a typical example being the JKFF. Unlike latches, they only respond to a transition on a clock input or to a change in an asynchronous input such as Clear.

What is synchronous and asynchronous flip-flop?

In a synchronous counter, all the flip-flops are triggered by the same clock signal whereas in an asynchronous counter, flip-flops are triggered with different clock signals. Unlike an asynchronous counter, the state of the output bits changes simultaneously in a synchronous counter, without any ripple.

What are the applications of counters?

Counters are used not only for counting but also for measuring frequency and time ; increment memory addresses . Counters are specially designed synchronous sequential circuits, in which , the state of the counter is equal to the count held in the circuit by the flip flops.

Why asynchronous counter is called ripple counter?

Asynchronous counters are slower than synchronous counters because of the delay in the transmission of the pulses from flip-flop to flip-flop. Asynchronous counters are also called ripple-counters because of the way the clock pulse ripples it way through the flip-flops.

Why do we use T flip-flop?

T flip-flops are handy when you need to reduce the frequency of a clock signal: If you keep the T input at logic high and use the original clock signal as the flip-flop clock, the output will change state once per clock period (assuming that the flip-flop is not sensitive to both clock edges).

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. The truth table for the D Flip Flop is shown in Figure 2.