SR Latch Circuit Functionality

This video tutorial focuses on the SR latch circuit using NAND gates. It begins with an explanation of the NAND gate truth table, followed by the SR latch truth table. The video discusses invalid conditions in the SR latch and explains how set and reset operations affect the circuit. It also covers the memory function of the SR latch, illustrating how the circuit retains its previous output. The tutorial concludes with a summary of the final conditions and key points about the SR latch circuit.

What is the output of a NAND gate when both inputs are high?

• Undefined

• Same as inputs

• Low

• High

In the SR latch using NAND gates, what is the state of Q and Q bar when both S and R are zero?

• Both are 1

• Q is 1, Q bar is 0

• Both are 0

• Q is 0, Q bar is 1

What happens to Q and Q bar when the reset button is pressed in the SR latch circuit?

• Q becomes 0, Q bar becomes 1

• Q becomes 1, Q bar becomes 0

• Both become 1

• Both remain unchanged

What is the initial state of Q and Q bar when the circuit is reset?

• Both are 0

• Both are 1

• Q is 1, Q bar is 0

• Q is 0, Q bar is 1

When both set and reset buttons are pressed, what is the state of the SR latch circuit?

• Q becomes 0, Q bar becomes 1

• No change in output

• Q and Q bar both become 1

• Q and Q bar both become 0

What does the SR latch circuit retain when both inputs are high?

• Both outputs become 0

• Undefined state

• New input

• Previous output

What is the effect of changing the input R from 0 to 1 while S remains 1 in the SR latch circuit?

• Q becomes 0, Q bar becomes 1

• Q becomes 1, Q bar becomes 0

• Both become 0

• No change in output

What is the result when the set button is pressed and the reset button is not?

• Q becomes 0, Q bar becomes 1

• Both remain unchanged

• Both become 1

• Q becomes 1, Q bar becomes 0

How does the SR latch circuit behave when both inputs are changed simultaneously?

• Outputs change immediately

• Outputs become opposite

• Outputs remain the same

• Outputs become undefined

What is the significance of the memory state in the SR latch circuit?

• It sets the circuit

• It makes the circuit undefined

• It retains the previous output

• It resets the circuit