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TRUTH TABLE CONSTRUCTIONFOR NAND

WEEK 8.

CLASS: SS 2

SUBJECT: COMPUTER SCIENCE TOPIC: LOGIC CIRCUIT (II) CONTENT:

  1. Truth table construction for: NAND, NOR
  2. Equation for NAND, NOR , gates
  3. Uses of logic gates (i) As building blocks for Hardware/electronic Components,
  4. Construction of simple

 

Sub-Topic 1: Truth table construction for NAND

INPUT INPUT OUTPUT

(AND)

 OUTPUT

(NAND)
X Y X.Y X.Y
1 1 1 0
1 0 0 1

 

0 1 0 1
0 0 0 1

Two inputs NAND gate.

The Boolean expression is A.B=Q

 

 

Truth table construction for NOR

INPUT INPUT OUTPUT

(OR)

 OUTPUT

(NOR)
X Y X+Y X+Y
1 1 1 0
1 0 1 0
0 1 1 0
0 0 0 1

Two inputs NOR gate.

The Boolean expression is A+B=Q

 

Sub-Topic 2: USES OF LOGIC GATES

  1. Logic gates are used as elementary blocks for devices where signals needed to be selected or assembled in a controlled form. This application is evident in telephone switching, satellite transmission and digital computer operations.
  2. They can be used in making
  3. They are used in the design of transistors, resistors and
  4. Logic circuits are used in integrated circuits, vacuum tube, amplifier, circuit boards and oscillator circuit.
  5. Resistor-Transistor Logic (RTL) and emitter coupled logic (ECL) are used in production of a very high speed CPU.

 

Construction of simple comparator

Comparator is a combinational logic circuit that compares the magnitudes of two binary quantities to determine which one has the greater magnitude. In other word, a comparator determines the relationship of two binary quantities.

 

EVALUATION

  1. Give one distinct feature of NAND and NOR
  2. Write simple truth tables for NAND and NOR
  3. State two uses of NAND
  4. What type of gate is output equals 1 if the two inputs have equal

 

READING ASSIGNMENT

Read on computer data conversion and summary in not more than ½ pages.

 

WEEKEND ASSIGNMENT

  1. Logic gates have number of output(s).
  2. AND+NOT=
  3. OR+NOT=
  4.  is an elementary building block of a digital
  5. All digital circuits are either or                       

 

ESSAY QUESTIONS

  1. What is an alternate logic gate? And mention its two
  2. Construct a NAND truth table of three inputs A, B, and

 

 

 

 

 

 

 

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