13.4.2 Exploring combinational logic circuits

• What is a combinational logic circuit?

  Output depends solely on inputs
• A truth table maps all possible input combinations to their corresponding outputs
• The XOR gate outputs 1 if both inputs are 1.

  False
• Combinational logic circuits depend solely on the current combination of inputs
• What does a truth table map in combinational logic circuits?

  Input combinations to outputs
• What distinguishes combinational logic circuits from sequential logic circuits?

  No memory or feedback
• The OR gate outputs 1 if any input is 1
• The purpose of a truth table is to fully specify the behavior of a combinational circuit
• Steps to construct a truth table for a basic combinational logic gate

  1️⃣ Identify all possible input combinations

  2️⃣ Determine the output for each combination based on the gate's function

  3️⃣ Organize inputs and outputs in a table format
• The output of an OR gate is 0 only when all inputs are 0.

  True
• To construct a truth table for a basic combinational logic gate, you need to consider all possible input combinations
• What is the output of an OR gate when both inputs are 0?

  0
• A truth table provides a complete and unambiguous specification of the logic function implemented by a circuit
• What is the output of an OR gate when the inputs are 0 and 1?

  1
• What is the output of an OR gate when both inputs are 1?

  1
• The output of an OR gate is 1 when at least one input is 1
• A truth table provides a complete specification of a combinational logic circuit's behavior.

  True
• What is the output of an OR gate when both inputs are 1?

  1
• What is the output of an OR gate when the inputs are 1 and 0?

  1
• Match the input with the output for a NOT gate:

  0 ↔️ 1

  1 ↔️ 0
• What is the output of a NOT gate when the input is 1?

  0
• The output of a NOT gate is the complement of its input.


  True
• What is the output of an XOR gate when both inputs are 0?

  0
• The output of an XOR gate is 1 when the inputs are 1 and 0
• The output of an XOR gate is 0 when both inputs are 0.


  True
• What is a truth table used for in combinational logic circuits?

  Complete circuit behavior
• Combinational logic circuits have memory elements or feedback loops.

  False
• The AND gate outputs a 1 only when both inputs are 1
• The NOT gate outputs the opposite of its input.

  True
• The AND gate outputs a 1 only when both inputs A and B are 1
• The NOT gate outputs the opposite of the input.
• A truth table is a tabular representation that shows all possible input combinations and their corresponding outputs.
• Match the logic gate with its function:

  AND Gate ↔️ Outputs 1 when both inputs are 1

  OR Gate ↔️ Outputs 1 when either input is 1

  NOT Gate ↔️ Inverts the input

  XOR Gate ↔️ Outputs 1 when inputs are different
• A truth table is a tabular representation that shows all possible input combinations and their corresponding outputs
• The OR gate outputs a 1 if either or both of the inputs A and B are 1
• The NOT gate outputs the opposite
• The XOR gate outputs a 1 when the inputs are different
• Order the basic logic gates by their output behavior when both inputs are 1:

  1️⃣ AND gate (output: 1)

  2️⃣ OR gate (output: 1)

  3️⃣ NOT gate (output: 0)

  4️⃣ XOR gate (output: 0)
• The AND gate outputs a 1 only when both inputs are 1
• Match the logic gate with its function:

  AND ↔️ Outputs 1 when both inputs are 1

  OR ↔️ Outputs 1 when either input is 1

  NOT ↔️ Inverts the input

  XOR ↔️ Outputs 1 when inputs are different