It is an electronic circuit having one or more than one input and only one output. Not, or, and and gates are the basic types of gates. Based on this, logic gates are named as and gate, or gate, not gate etc. The topics that are covered in this pdf containing digital logic previous year gate solved questions are. Logic gates are the building blocks of digital technology. Logic gates are the building blocks of a digital circuit. In this lesson, we will further look at the different types of basic logic gates with their truth table and. Basic logic gates logic gates 1 department of computer. Boolean algebra and logic gates the most common postulates used to formulate various algebraic structures are.
The importance of nand nand gates are considered to be the universal gate, because any other gate can be synthesized eve engels, 2006 slide 22 of 20 using nand. This document is setup as a3 and can be printed off in a3a4. We will see the different logic levels in ttl circuits, cmos circuits, some simple logic gates like or, not, nand, and, etc. Other terms which are used for the true and false states are shown in the table. In fact, most gates are implemented in solidstate ttl chips transistortransistor logic e. The below links will give you access to free download handwritten notes for gate computer science engineering as shared by toppers from made easy. Every terminal in a logic gate will always be in one of the two binary states 0 or 1. At any given moment, every terminal is in one of the two binary conditions false high or true low. In reality, gates consist of one to six transistors, but digital designers think of them as a single unit. Digital logic gate functions include and, or and not. This is a pdf document the revision is based on the gcse ocr computer science specification on topics. Computer logic organization tutorial in pdf tutorialspoint.
Logic gates are electronic digital circuit perform logic functions. Commonly expected logic functions are already having the corresponding logic circuits in integrated circuit i. Statistics with r programming pdf notes download b. Simple logic processor circuit or you can say a simple computer. A logic gate is a building block of a digital circuit. Use boolean algebra and the karnaugh map as tools to simplify and design logic circuits. A free powerpoint ppt presentation displayed as a flash slide show on id. The attached pdf contains all questions asked in previous years of computer science engineering gate exam for the topic digital logic along with answers. Introduction logic gates process signals which represent true or false. Computer organization and architecture logic design. The aim of this book is to give students of computer science a working knowledge of the relevant parts of logic. Computer networking 73 conversion rate optimization 2 converters 1 cro 5 dc. Input refers to the information you give the logic gate, and output refers to what it spits out.
So a computer wouldnt take an input of 5 or 6 all of the information need to be 0s and 1s reminder. Xor gate exclussive or the function xor has the following intendment. Logic gates practice problems key points and summary first set of problems from q. The input terminals of logic gates accept binary signals within the allowable range and respond at the output terminals w binary signals that fall within a specified range. Logic minimization logic gates in the standard circuits with transistorminimum gate equivalents by taking advantage of nandnor logic results in the minimized pos and sop circuits shown in the green boxes. Convert a logic expression into a sumofproducts expression. Basic logic gates types, functions, truth table, boolean. Most logic gates have two inputs and one output and are based on boolean algebra. Truth tables are used to help, show the function of a logic gate. Lets try this example again, keeping this rule in mind. Binary systems, boolean algebra, logic gates, analysis or design of combinatorial circuits, synchronous sequential logic, registers, counters and memory, laboratory experiments in digital circuits and logic logic design, contemporary logic design, switches.
The relationship between the input and the output is based on a certain logic. Multiple choice questions and answers on logic gates. Note there are no constraints on the number of gate inputs. Explain the operation of both exclusiveor and exclusivenor circuits. It provides digital parts ranging from simple gates to arithmetic logic unit. This system facilitates the design of electronic circuits that convey information, including logic gates. Computing with logic gates how are these logic functions actually computed in hardware. Mathematical foundation of computer science notes pdf download b.
The karnaugh map provides a method for simplifying boolean expressions it will produce the simplest sop and pos expressions works best for less than 6 variables similar to a truth table it maps all possibilities a karnaugh map is an array of cells arranged in a special manner the number of cells is 2n where n number of variables a 3variable karnaugh map. Beginning with digital logic gates and progressing to the design of combinational and sequential circuits, harris and harris use these elementary developing blocks as the thought for what follows. In simple terms, logic gates are the electronic circuits in a digital system. Dear gate aspirants of computer science engineering. The gate responds continuously to changes in input with a small delay. Computer science binary and logic gates revision map. All books are in clear copy here, and all files are secure so dont worry about it. Download basic logic gates logic gates 1 computer science at. The interconnection of gates to perform a variety of logical operation is called logic design. In this tutorial, we will have a brief introduction to logic gates. Digital logic is the basis of electronic systems, such as computers and cell phones. A binary operator on a set s is said to be associative whenever.
Logic minimisation any boolean function can be implemented directly using combinational logic gates however, simplifying the boolean function will enable the number of gates required to be reduced. A gate is an electronic device which is used to compute a function on a two valued signal. As engineers, one of our primary goals is to implement circuits efficiently. I am sharing the free direct download links to made easy computer science gate handwritten notes. These binary states represent the presence 1, or absence 0, of an electrical voltage. Download digital design and computer architecture pdf ebook. Digital electronics part i combinational and sequential. Basic logic gates logic gates 1 computer science at. How to draw a logic gate in computer with microsoft word tutorial in english. Pdf digital logic gate solved questions previous year.
Digital design and computer architecture takes a singular and fashionable technique to digital design. It provides various methods and techniques suitable for a variety of digital system design applications and covers all aspects of digital systems from the electronic. What is logic gate and, or, xor, not, nand, nor and xnor. Binary algebra, logic gates, digital integrated circuits, flipflops and sequential logic circuits, applications of logic circuits. Read online basic logic gates logic gates 1 computer science at. Digital logic design is a software tool for designing and simulating digital circuits. Logic gates are the basic building blocks of any digital system.
It is a mechanical, optical, or electronic system that performs a logical operation on an input signal. Digital logic is rooted in binary code, a series of zeroes and ones each having an opposite value. Introduction to logic gates not, and, nand, or, nor. Ppt basic logic gates powerpoint presentation free to. Perform the necessary steps to reduce a sumofproducts expression to its simplest form. Both sides have activities based on the two topics. In this software, circuit can easily be converted into a reusable module. Logic gates are used to carry out logical operations on single or multiple binary inputs and give one binary output. Morris mano the book presents the basic concepts used in the design and analysis of digital systems and introduces the principles of digital computer organization and design. Write a logic function that is true if and only if x, when interpreted as an unsigned binary number, is greater than the number 4.
A gate is an electronic device that produces a result based on two or more input values. Guru jambheshwar university of science and technology, hisar. A truth table lists all possible combination of inputs and the corresponding outputs. Logic gates pdf 74p download book online computer ebooks. Logic gates exercises logic gates exercises build truth tables for following logic gates.1187 823 928 1496 52 152 1141 170 811 884 1278 454 605 1327 71 775 550 502 1386 315 1527 1500 407 1118 1309 1524 1030 527 1014 917 1065 279 695 1282 1062 879 751 196 895 928 1240 1055 855 436 703