Implementing 1x4 DeMultiplexer

Duration: 5 min

This video lesson is available to enrolled students.

Return to /learn/RSSB-SENIOR-COMPUTER-INSTRUCTOR/paper-2-digital-logic-systems/combinational-circuit/demux-decoder-encoder/asset-implementing-1x4-demultiplexer after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Mensuration and Geometry, Age Problems, Arithmetic, Statistics, Probability, Profit and Loss, Simple Interest and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, Powers and Exponents (Surds and Indices), Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy
  3. Paper-1 & 2 | Data Interpretation: Data Interpretation
  4. Paper-1 & 2 | General Mental Ability: Mental Ability, RSSB Specific Videos - Mental Ability
  5. Paper-1 & 2 | Logical Reasoning and Analytical Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Syllogisms, Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Venn Diagram, Analogy, Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Arrangement, Logical Sequence Of Words, Crypt Arithmetic
  6. Paper-1 & 2 | Decision Making and Problem Solving: Selection Decision Table (Decision Making)
  7. Paper-1 | General Science: Physics, Biology, Chemistry, RSSB Specific Videos
  8. Paper-1 | General Awareness: State Wise GK, GK- Current Affairs
  9. Paper-2 | Fundamentals of Computer: Basics of COA, Number System, Floating Point Rep, Number Representation
  10. Paper - 2 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits
  11. Paper-2 | Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Linux OS, Distributed Systems
  12. Paper-2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, Relational Calculus, File Organization & Indexing, Transaction Management, Concurrency Control
  13. Paper-2 | Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  15. Paper 2 | Oops, C++, Java: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
  16. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  17. Paper 2 | Emerging Trends and AI: Emerging Tech Trends, Artificial Intelligence
  18. Paper-2 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Advanced Algorithms
  19. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security, Ethical Hacking
  20. Paper-2 I Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  21. Paper-2 | Computer Organization and Architecture: Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations
  22. Paper-2 | Web Development: JavaScript-Basics, HTML Basics, CSS, XML
  23. Pedagogy: Child Development, Concept of Pedagogy, Psychology, Theories, Inclusive Education, Experiential Pedagogy, Curriculum Framework & Reforms, National Education Policy (NEP) 2020
  24. Live Sessions: RSSB Live Sessions
  25. RSSB Paper 1 - Full Mock Tests:
  26. RSSB Paper 2 - Full Mock Tests:
  27. SCI Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video provides a comprehensive tutorial on the design and implementation of a 1-to-4 Demultiplexer in digital electronics. The instructor, Sanchit Jain Sir, guides the viewer through the entire design process, starting with the conceptual block diagram and moving to the functional truth table. The lesson culminates in the detailed drawing of the logic circuit using AND gates and inverters. The core concept demonstrated is how a single input signal is routed to one of four distinct outputs based on the binary value of the select lines.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The session begins with the instructor standing before a whiteboard displaying the title "1 to 4 Demultiplexer". He starts by sketching a large rectangle to represent the demultiplexer block. Inside the box, he writes "DeMux" and "1X4" to denote the device type. He then labels the single data input line 'I' entering from the left. On the right side, he draws four output lines labeled O0, O1, O2, and O3. At the bottom, he adds two select lines, S1 and S0. After completing the block diagram, he draws a vertical line to separate the diagram from the truth table. He creates a table with headers for inputs S1, S0 and outputs O3, O2, O1, O0. He fills the input columns with the standard binary count sequence: 00, 01, 10, and 11.

  2. 2:00 – 4:31 02:00-04:31

    The instructor proceeds to fill the truth table. He explains that for each row, only one output should be active. He writes 'I' in the O0 column for the first row (00), 'I' in O1 for the second row (01), 'I' in O2 for the third row (10), and 'I' in O3 for the fourth row (11), leaving other outputs as 0. Next, he moves to the right side of the board to draw the logic circuit. He draws four AND gates stacked vertically. He connects the main input 'I' to one input of each AND gate. He then connects the select lines S1 and S0 to the remaining inputs of the gates. To ensure the correct minterm is generated, he adds NOT gates (inverters) to the select lines. For instance, the top gate receives S1' and S0', while the bottom gate receives S1 and S0. He carefully draws the connections to show how the select lines control the enablement of each AND gate. Finally, he draws a box around the entire circuit to signify the completed design.

The video effectively demonstrates the step-by-step derivation of a 1-to-4 Demultiplexer. By starting with the block diagram, the instructor establishes the interface. The truth table clarifies the logical function, showing that the input is passed to the output selected by the binary value on S1 and S0. The final circuit diagram translates this logic into hardware, using AND gates to implement the minterms and inverters to handle the complemented select lines. This structured approach reinforces the relationship between truth tables and logic gate implementations.

Loading lesson…