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Note for Digital Electronics Circuit - DEC By Manoj Kumar

  • Digital Electronics Circuit - DEC
  • Note
  • Chhattisgarh Swami Vivekanand Technical University - CSVTU
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Manoj Kumar
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LOGIC GATES IN DIGITAL ELECTRONICS • AND GATE • OR GATE • NOT GATE • NAND GATE • NOR GATE • X-OR GATE • X-NOR GATE • BUBBLED AND GATE • BUBBLED OR GATE • BUBBLED NAND GATE • BUBBLED NOR GATE

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INTRODUCTION In electronics, a logic gate is an idealized or physical device implementing a Boolean function; that is, it performs a logical operation on one or more binary inputs, and produces a single binary output. Logic gates are the basic building blocks of digital electronics which have 1 or more input signals based on which it gives one logical output. Logic gate works on digital signals only and there are two states of these signals i.e. 0 as low and 1 as high or ON and OFF state. That’s why Logic Gates are known as digital electronic devices. The logical state of any terminal of gate can change its state, and it does generally change, as processing is happening in the circuit. A table which gives the relation between different input signals corresponding to its output is known as Truth Table. By the help of this truth table we can identify how logic circuit works in response with different input signals which we apply to logic gates. Based on the input-output relation we have different kinds of logic gates. Three basic logic gates are as follows OR gate, AND gate and NOT gate. Others are NAND, NOR, XOR and Ex-OR gates. Fig:- Basic and universal logic gates

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AND GATE An AND gate has two or more inputs but only one output. The output assumes the logic 1 state, only when each one of its inputs is at logic 1 state. The output assumes the logic O state even if one of its inputs is at logic 0 state. The AND gate may, therefore, be defined as a device whose output is 1, if and only if all its inputs are 1. Hence the AND gate is also called an all or nothing gate. TRUTH TABLE A B Output 0 0 0 0 1 0 1 0 0 1 1 1

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OR GATE Like an AND gate, an OR gate may have two or more inputs but only one output. The output assumes the logic 1 state, even if one of its inputs is in logic 1 state. Its output assumes me logic O state, only when each one of its inputs is in logic O state. An OR gate may, therefore, be defined as a device whose output is 1, even if one of its inputs is 1. Hence an OR gate is also called an any or all gate. It can also be called an inclusive OR gate because it includes the condition 'both inputs can be present'. TRUTH TABLE A B Output 0 0 0 0 1 1 1 0 1 1 1 1

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