3. multiplexer
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This document discusses multiplexers, which take multiple input signals and steer one of the inputs to the output based on control signals. It provides examples of 4-to-1, 16-to-1, and 8-to-1 multiplexers and describes how their outputs are determined by the states of the control signals. It also describes the IC 74150 16-to-1 multiplexer chip and the nibble multiplexer, which selects between two 4-bit nibbles as its output.
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This presentation introduces digital logic circuits such as encoders, decoders, multiplexers, demultiplexers and logic gates. It is presented by a group consisting of 5 members whose names and student IDs are listed. The topics covered include the definitions of complements, combinational logic circuits, encoder and decoder functions, how multiplexers and demultiplexers work, and the truth tables of common logic gates.
Logic System Design KTU Chapter-4.ppt
This document discusses combinational logic circuits and their analysis and design using Boolean algebra and Karnaugh maps. It covers concepts like logic gates, Boolean functions, truth tables, logic minimization, adders, comparators, decoders, encoders, multiplexers and their implementation in Verilog. Example circuits described include half adder, full adder, binary multiplier, magnitude comparator, decoder, encoder, multiplexer. Analysis methods covered are deriving truth tables from logic diagrams, using Karnaugh maps for function minimization, and verifying designs using test benches in Verilog.
Combinational circuits
topics covered in these slides are
Boolean Algebra
Decoder
Encoder
Multiplexer
For Video Lectures pr concepts
http://sh.st/QsyAp
Digital Logic circuit
This document provides an overview of digital logic circuits and sequential circuits. It discusses various logic gates like OR, AND, NOT, NAND, NOR and XOR gates. It explains their truth tables and symbols. It also covers Boolean algebra, map simplification using K-maps, combinational circuits like multiplexers, demultiplexers, encoders and decoders. Finally, it describes different types of flip-flops like SR, D, JK and T flip-flops which are used to build sequential circuits that have memory and can store past states.
dld.ppt
Digital systems use discrete binary values represented as 0s and 1s to process information. Common digital systems include computers, cameras, calculators, televisions and more. Analog systems represent information as continuously variable physical quantities, while digital systems represent information as discrete values. Binary digits (bits) are the fundamental units of digital systems and can have values of 0, 1, low, high, on or off. Logic gates like AND, OR, NOT, NAND and NOR are basic building blocks used to perform operations on binary inputs and produce binary outputs.
Decoders-Digital Electronics
Contents:-
#Decoders
#General Decoder Diagram
#2-to-4 Line Decoder
#3-to-8 Line Decoder
#4-to-16 Line Decoder
#BCD-to-Decimal Decoder/4-to-10 Line Decoder
#BCD-to-Seven Segment Decoder
#Decoder Applications
Mcsl 17 ALP lab manual
The document provides solutions to various digital logic design problems involving gates like XOR, OR, NAND and circuits like alarm circuit, encoder, decoder, multiplexer, flip-flops, counters and linear feedback shift register. The problems are solved through truth tables, K-maps and schematic diagrams. Implementation of basic gates to realize complex functions and sequential circuits are demonstrated.
Decoder
A decoder is a logic circuit that takes a binary input and activates only one of multiple outputs based on the input value. If a decoder has an n-bit input, it will have 2^n outputs. The decoder's truth table shows the logic function that maps each input combination to activate the correct output. The circuit diagram implements this logic function using gates.
B sc3 unit 4 combi..lckt
1. The document discusses combinational logic circuits and describes various types including half adders, full adders, decoders, encoders, multiplexers, and comparators.
2. It provides truth tables and logic expressions to define the functions of these circuits. Diagrams of logic gate implementations are also shown.
3. Examples of specific combinational circuits are analyzed in detail like a 4-bit magnitude comparator, priority encoders, decoders, and a BCD to decimal decoder. Their applications in digital systems are also mentioned.
I semester Unit 4 combinational circuits.pptx
- Combinational circuits consist of logic gates whose outputs depend only on the present inputs. They have no memory.
- A half adder is a basic combinational circuit that adds two 1-bit numbers and produces a sum and carry output. A full adder adds three 1-bit numbers.
- Other common combinational circuits described in the document include half and full subtractors, magnitude comparators, encoders, decoders, multiplexers, and demultiplexers. Each has a specific function and truth table defining its input-output behavior.
Encoders
An encoder converts an input code into an output code, performing the inverse operation of a decoder. It has 2N inputs and N outputs, where the output is the binary value of the selected input. Issues can arise if more than one input is active or if no inputs are active. A priority encoder addresses this by encoding the higher-order active input value and including a valid indicator to show whether the output is valid. VHDL code is provided for a 4-to-2 priority encoder with a valid bit that encodes the most significant active input value and sets the valid bit inactive only when no inputs are active.
digita circuit design.pptx
This document provides an overview of digital circuit design and its key components. It begins with an introduction to logic gates such as AND, OR, NOT, NAND, NOR, and XOR gates. Next, it covers Boolean algebra and map simplification techniques. It then discusses combinational circuits like multiplexers, demultiplexers, encoders, and decoders. The document proceeds to explain sequential circuits like flip-flops, including SR, D, JK, and T flip-flops. It concludes with a brief overview of sequential circuits and their use of flip-flops as state memory elements.
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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3. multiplexer
- 1. MULTIPLEXER Dr. N. Anuradha Asst. Professor of Physics Bon Secours College for Women Thanjavur
- 2. MULTIPLEXER Multiplexer means many into one Many inputs, only one outputs Control signals steer any input to the output Also called data selector General idea & general circuit n – input signals m – control signals 1- output signals m control signals select 2m input signals = n < 2m
- 3. 4 - to - 1 Multiplexer Depending on control inputs A & B = one of the four inputs D0 to D3 steered to output Y SOP Operation Y = A B D0 + ABD1 + ABD2 + ABD3 If A = 0, B = 0 Y = 0 0 D0 + 0 0 D1 + 0 0 D2 + 0 0 D3 Y = 1 1 D0 + 1 0 D1 + 0 1 D2 + 0 0 D3 Y = D0 A = 0, B = 0 == upper AND gate is active, others inactive Y = D0 A = 0, B = 1 == Second AND gate is active, others inactive Y = D1 A = 1, B = 0 == Third AND gate is active, others inactive Y = D2 A = 1, B = 1 == Fourth AND gate is active, others inactive ====== Y = D3
- 5. 16 - to - 1 Multiplexer Inputs = D0 to D15 When ABCD = 0000, Upper AND = active, other gates = disabled, D0 transmitted to output Y = D0 If D0 = 0, Y = 0, If D0 = 1, Y = 1 The value Y depends on D0 When ABCD = 1111, Lower AND gate is active, others inactive Y = D15 Output Y = 8 - to - 1 Multiplexer Inputs = D0 to D7, Three control inputs When ABC = 000, Y = D0 ABC = 001, Y = D1 ABC = 010, Y = D2 ……………………….. ABC = 111, Y = D7
- 7. IC 74150 16 - to - 1 TTL multiplexer, 24 pin IC Pin 1 to 8 & 16 to 23 ===== D0 to D15 Pin 11, 13, 14, 15 ======= A, B, C, D Pin 10 = output = complement of the selected data bit Pin 9 = Strobe = enables or disables the input Low strobe = enable the multiplexer ====== Y = Dn High strobe = disable the multiplexer ====== Output = high === value of ABCD doesn’t matter Two standard methods for implementing truth table 1. Sum of products 2. Product of sum 3. Third method is multiplexer solution i.e., complementing each Y output = data input
- 9. Multiplexer Logic Complementing each Y output = data input 1. D0 = î = 0 2. D1 = ô = 1 ……………. D15 = î = 0 Bubbles on Signal lines Bubble on the line = complement Bubbles = indicate active low signal Nibble Multiplexer Input = 4 bits = nibble = A3A2A1A0 = B3B2B1B0 SELECT = determine which nibble is transmitted to output SELECT = Low = Four NAND gates on left activated Y3Y2Y1Y0 = A3A2A1A0 SELECT = High = Four NAND gates on right activated Y3Y2Y1Y0 = B3B2B1B0
- 10. Nibble Multiplexer – IC 74157 Has Strobe input Strobe is active low input Strobe = low ==== multiplexer is active Strobe = high ==== multiplexer is inactive