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Questions and Answers
What is the main purpose of an SR latch in digital circuits?
What is the main purpose of an SR latch in digital circuits?
- To amplify signals
- To store memory (correct)
- To convert analog signals to digital
- To perform arithmetic operations
Output Q and output $ar{Q}$ of an SR latch are the same.
Output Q and output $ar{Q}$ of an SR latch are the same.
False (B)
How many NAND gates are used in a typical SR latch circuit?
How many NAND gates are used in a typical SR latch circuit?
Two
In an SR latch, the input lines are labeled as S and ______.
In an SR latch, the input lines are labeled as S and ______.
Match the components of an SR latch with their functions:
Match the components of an SR latch with their functions:
Flashcards
SR Latch
SR Latch
A circuit that stores a binary value (0 or 1) and holds it until an input signal changes its state.
S (Set) Input
S (Set) Input
Input that 'sets' the output Q to 1 and output Qbar to 0.
R (Reset) Input
R (Reset) Input
Input that 'resets' the output Q to 0 and output Qbar to 1.
Complementary Outputs (Q and Qbar)
Complementary Outputs (Q and Qbar)
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Cross-Coupled NAND Gates
Cross-Coupled NAND Gates
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Study Notes
Logic Circuit: SR Latch
- The circuit uses two NAND gates to create a set-reset (SR) latch.
- Input signals 'S' and 'R' control the latch's state.
- 'S' stands for set, while 'R' represents reset.
- Output signals 'Q' and 'QÌ…' (not Q) are the latch's outputs.
- The circuit design features a cross-connected feedback loop formed by the NAND gates' outputs feeding their inputs.
- This feedback loop produces the latch's bistable characteristic.
- When S = 1 and R = 0, the output Q is 1 (set).
- If S = 0 and R = 1, the output Q is 0 (reset).
- The SR latch can be in a stable state only in two situations.
- These states are 10 (Q=1) and 01 (Q=0).
- Any other combination of S and R would transition the output resulting in an indeterminate state of the latch.
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