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Learning objective

Logic gates: Construct truth tables for the following logic gates: • NOT • AND • OR • XOR • NAND • NOR. Students should know and be able to use ANSI/ IEEE standard 91-1984 Distinctive shape logic gate symbols for these logic gates. Be familiar with drawing and interpreting logic gate circuit diagrams involving one or more of the above gates. Complete a truth table for a given logic gate circuit. Write a Boolean expression for a given logic gate circuit. Draw an equivalent logic gate circuit for a given Boolean expression. Recognise and trace the logic of the circuits of a half-adder and a full-adder. Construct the circuit for a half-adder. Be familiar with the use of the edge-triggered D- type flip-flop as a memory unit. Knowledge of internal operation of this flip-flop is not required.

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Logic gates

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Logic gates

Aqa A Level Computer ScienceFundamentals of computer systems

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Logic gates: Construct truth tables for the following logic gates: • NOT • AND • OR • XOR • NAND • NOR. Students should know and be able to use ANSI/ IEEE standard 91-1984 Distinctive shape logic gate symbols for these logic gates. Be familiar with drawing and interpreting logic gate circuit diagrams involving one or more of the above gates. Complete a truth table for a given logic gate circuit. Write a Boolean expression for a given logic gate circuit. Draw an equivalent logic gate circuit for a given Boolean expression. Recognise and trace the logic of the circuits of a half-adder and a full-adder. Construct the circuit for a half-adder. Be familiar with the use of the edge-triggered D- type flip-flop as a memory unit. Knowledge of internal operation of this flip-flop is not required

  • This point belongs to Logic gates, especially Logic gates.
  • You need to be able to logic gates: Construct truth tables for the following logic gates: • NOT • AND • OR • XOR • NAND • NOR. Students should know and be able to use ANSI/ IEEE standard 91-1984 Distinctive shape logic gate symbols for these logic gates. Be familiar with drawing and interpreting logic gate circuit diagrams involving one or more of the above gates. Complete a truth table for a given logic gate circuit. Write a Boolean expression for a given logic gate circuit. Draw an equivalent logic gate circuit for a given Boolean expression. Recognise and trace the logic of the circuits of a half-adder and a full-adder. Construct the circuit for a half-adder. Be familiar with the use of the edge-triggered D- type flip-flop as a memory unit. Knowledge of internal operation of this flip-flop is not required.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

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This objective helps connect Logic gates to exam-style questions, flashcards, and revision notes for Logic gates.

Quick student answer

A NOT gate receives an input of 0. What is its output?

Direct answer

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Key terms

  • Truth table: A table listing every possible combination of binary inputs and the corresponding output or outputs of a logic gate or circuit.
  • Half-adder: A logic circuit that adds two one-bit inputs and produces a Sum output and a Carry output.

Common trap

Confusing OR with XOR: Remember that OR allows one or more 1 inputs, whereas XOR outputs 1 only when exactly one input is 1. Thus, 1 XOR 1 = 0.

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