The S-R latch composed of NAND gates is called an active low circuit because _____________a)It is only activated by a positive level triggerb)It is only activated by a negative level triggerc)It is only activated by either a positive or negative level triggerd)It is only activated by sinusoidal triggerCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Explanation:
The S-R latch composed of NAND gates is called an active low circuit because it is only activated by a negative level trigger. Let's understand this in detail.

Definition of Active Low Circuit:
An active low circuit is a circuit that responds to a low voltage or logic level. In other words, it is a circuit that is activated or triggered by a low voltage or logic level.

S-R Latch:
An S-R latch is a bistable circuit that can store one bit of data. It is composed of two cross-coupled NOR or NAND gates. The S-R latch has two inputs - Set (S) and Reset (R) - and two outputs - Q and Q' (the complement of Q). The S input is used to set the latch, and the R input is used to reset the latch.

S-R Latch Composed of NAND Gates:
The S-R latch can be composed of two NAND gates. In this configuration, the S and R inputs are connected to the inputs of the NAND gates. The outputs of the NAND gates are connected to each other and to the inputs of the other NAND gate. The outputs of the NAND gates are also the Q and Q' outputs.

Active Low Circuit:
In the S-R latch composed of NAND gates, the inputs are active low. This means that the latch is activated or triggered by a low voltage or logic level. The S input is active low, which means that the latch is set when the S input is low. The R input is also active low, which means that the latch is reset when the R input is low.

Negative Level Trigger:
A negative level trigger is a trigger that is activated by a low voltage or logic level. In the S-R latch composed of NAND gates, the inputs are negative level triggers. This means that the latch is set or reset when the S or R input is low.

Conclusion:
In conclusion, the S-R latch composed of NAND gates is called an active low circuit because it is only activated by a negative level trigger. The inputs of the latch are active low, and the latch is set or reset when the S or R input is low.

Answer

Active low indicates that only an input value of 0 sets or resets the circuit.

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