Sequential Logic Latches and Flip-Flops. Sequential Logic Circuits The output of sequential logic circuits depends on the past history of the state of.

Slides:

Advertisements

Similar presentations

CS1104 – Computer Organization Aaron Tan Tuck Choy School of Computing National University.

Advertisements

Introduction to Sequential Logic Design Latches. 2 Terminology A bistable memory device is the generic term for the elements we are studying. Latches.

Latches CS370 –Spring 2003 Section 4-2 Mano & Kime.

A. Abhari CPS2131 Sequential Circuits Most digital systems like digital watches, digital phones, digital computers, digital traffic light controllers and.

MOHD. YAMANI IDRIS/ NOORZAILY MOHAMED NOOR1 Sequential Circuit Latch & Flip-flop.

CENG 241 Digital Design 1 Lecture 8 Amirali Baniasadi

CHAPTER 3 Sequential Logic/ Circuits.  Concept of Sequential Logic  Latch and Flip-flops (FFs)  Shift Registers and Application  Counters (Types,

Digital Logic Chapter 5 Presented by Prof Tim Johnson

Flip-Flops and Related Devices Wen-Hung Liao, Ph.D.

1 Sequential Systems A combinational system is a system whose outputs depend only upon its current inputs. A sequential system is a system whose outputs.

Sequential Logic Latches & Flip-flops

1 Chapter 8 Flip-Flops and Related Devices. 2 Figure 8--1 Two versions of SET-RESET (S-R) latches S-R (Set-Reset) Latch.

1 Sequential Circuits –Digital circuits that use memory elements as part of their operation –Characterized by feedback path –Outputs depend not only on.

Sequential Circuits : Part I Read Sections 5-1, 5-2, 5-3.

Latches and Flip-Flops Discussion D8.1 Section 13-9.

Digital Logic Design Lecture 22. Announcements Homework 7 due today Homework 8 on course webpage, due 11/20. Recitation quiz on Monday on material from.

EET 1131 Unit 10 Flip-Flops and Registers

1 © 2014 B. Wilkinson Modification date: Dec Sequential Logic Circuits – I Flip-Flops A sequential circuit is a logic components whose outputs.

EKT 124 / 3 DIGITAL ELEKTRONIC 1

Figure 7–1 Two versions of SET-RESET (S-R) latches

Sequential Logic Flip-Flops and Related Devices Dr. Rebhi S. Baraka Logic Design (CSCI 2301) Department of Computer Science Faculty.

Latches Module M10.1 Section 7.1. Sequential Logic Combinational Logic –Output depends only on current input Sequential Logic –Output depends not only.

ENGIN112 L20: Sequential Circuits: Flip flops October 20, 2003 ENGIN 112 Intro to Electrical and Computer Engineering Lecture 20 Sequential Circuits: Flip.

Latches Section 4-2 Mano & Kime. Sequential Logic Combinational Logic –Output depends only on current input Sequential Logic –Output depends not only.

CS 151 Digital Systems Design Lecture 20 Sequential Circuits: Flip flops.

Chapter 3: Sequential Logic Circuit EKT 121 / 4 ELEKTRONIK DIGIT 1.

BY: TRAVIS HOOVER 2/22/2011 CS 147 DR. LEE JK flip-flops.

Components used in the the Project J-K Flip Flop Switch Power Alternator 7-Segment Display Coded Decimal (BCD) Display.

Astable: Having no stable state. An astable multivibrator oscillates between two quasistable states. Asynchronous Having no fixed time relationship Bistable.

1 Sequential Circuit Latch & Flip-flop. 2 Contents Introduction Memory Element Latch  SR latch  D latch Flip-flop  SR flip-flop  D flip-flop  JK.

COE 202: Digital Logic Design Sequential Circuits Part 1

Eng. Mohammed Timraz Electronics & Communication Engineer University of Palestine Faculty of Engineering and Urban planning Software Engineering Department.

Flip-flops. Outline  Edge-Triggered Flip-flops  S-R Flip-flop  D Flip-flop  J-K Flip-flop  T Flip-flop  Asynchronous Inputs.

Introduction to Sequential Logic Design Flip-flops.

CHAPTER 3 Sequential Logic/ Circuits.  Concept of Sequential Logic  Latch and Flip-flops (FFs)  Shift Registers and Application  Counters (Types,

Introduction to Sequential Logic Design Flip-flops FSM Analysis.

Introduction to Sequential Logic Design Flip-flops.

Unit 11 Latches and Flip-Flops Fundamentals of Logic Design By Roth and Kinney.

FLIP FLOP By : Pn Siti Nor Diana Ismail CHAPTER 1.

Company LOGO DKT 122/3 DIGITAL SYSTEM 1 WEEK #12 LATCHES & FLIP-FLOPS.

Sequential Design Basics. Lecture 2 topics  A review of devices that hold state A review of Latches A review of Flip-Flops 8/22/2012 – ECE 3561 Lect.

Synchronous Sequential Circuits by Dr. Amin Danial Asham.

BR 8/991 DFFs are most common Most programmable logic families only have DFFs DFF is fastest, simplest (fewest transistors) of FFs Other FF types (T, JK)

1 Digital Fundamentals Chapter 8 Flip-Flops and Related Devices Resource: CYU / CSIE / Yu-Hua Lee / Not made by Engr. Umar Talha,

Chapter 10 Flip-Flops and Registers 1. Objectives You should be able to: Explain the internal circuit operation of S-R and gated S-R flip-flops. Explain.

1 COMP541 Sequential Circuits Montek Singh Feb 1, 2007.

EKT 221 / 4 DIGITAL ELECTRONICS II

Synchronous Sequential Logic A digital system has combinational logic as well as sequential logic. The latter includes storage elements. feedback path.

EKT 121 / 4 ELEKTRONIK DIGIT I

Sequential Circuit Latch & Flip-flop. Contents Introduction Memory Element Latch  SR latch  D latch Flip-flop  SR flip-flop  D flip-flop  JK flip-flop.

Chapter 6 – Digital Electronics – Part 1 1.D (Data) Flip Flops 2.RS (Set-Reset) Flip Flops 3.T Flip Flops 4.JK Flip Flops 5.JKMS Flip Flops Information.

Synchronous Sequential Circuits by Dr. Amin Danial Asham.

Synchronous Sequential Circuits by Dr. Amin Danial Asham.

Flip Flops Engr. Micaela Renee Bernardo. A latch is a temporary storage device that has two stable states (bistable). It is a basic form of memory. Latches.

Flip Flops 3.1 Latches and Flip-Flops 3 ©Paul Godin Created September 2007 Last Edit Aug 2013.

CENG 241 Digital Design 1 Lecture 7 Amirali Baniasadi

Dept. of Electrical Engineering

7. Latches and Flip-Flops Digital Computer Logic.

EEE 301 DIGITAL ELECTRONICS

Flip-Flop Flip-flops Objectives Upon completion of this chapter, you will be able to :  Construct and analyze the operation of a latch flip-flop made.

CSE 260 DIGITAL LOGIC DESIGN

Copyright ©2009 by Pearson Higher Education, Inc. Upper Saddle River, New Jersey All rights reserved. Digital Fundamentals, Tenth Edition Thomas.

Sequential logic circuits First Class 1Dr. AMMAR ABDUL-HAMED KHADER.

CS1103 Arunima Shukla Asim Marchant Urja Kantharia Harsh kosambia Digital Electronics Mini Project.

LATCHED, FLIP-FLOPS,AND TIMERS

Digital Design Lecture 9

CS1104 – Computer Organization

Introduction to Sequential Logic Design

Presentation transcript:

Sequential Logic Latches and Flip-Flops

Sequential Logic Circuits The output of sequential logic circuits depends on the past history of the state of the outputs.  Therefore, it incorporate a memory element (circuits must remember the past states of their outputs).  Main characteristic of these circuits  feedback An output logic level is treated just like another input to the circuit.

Sequential Logic Circuits Latches Flip-flops

The S-R (SET-RESET) Latch

Negative-OR equivalent of the NAND gate \S-\R latch

The S-R (SET-RESET) Latch

An Application of Latch

The Gated S-R Latch

The Gated D Latch

Flip-Flops Flip-flops are synchronous bistable devices.  Synchronous means that the output changes state only at a specified point on the triggering input called the clock (CLK).  Changes in the output occur in synchronization with the clock.

Edge-Triggered FFs

Edged-Triggered S-R FF

Edge-Triggered D FF

Edge-Triggered JK-FF JK-FF is versatile and is a widely used type of flip-flop. The functioning of the JK-FF is identical to that of the SR-FF in the SET, RESET, and NC.  The difference is that the JK-FF has NO invalid state as does the SR-FF.

Edge-Triggered JK-FF

Asynchronous Preset and Clear Inputs Most IC flip-flops have asynchronous inputs.  These are inputs that affect the state of the FF independent of the clock.  Preset (PRE) or direct set (S D )  Clear (CLR) or direct reset (R D ) Logic symbol for a J-K flip-flop active-LOW preset and clear inputs.

Edge-triggered JK-FF with PRE and CLR Toggle mode example

Flip-Flop Applications Parallel data storage

Flip-Flop Applications Frequency division

Flip-Flop Applications Frequency division

Flip-Flop Applications Counting

Flip-Flop Applications Counting