Why NAND and NOR gate are used in flip flop?

1- Any type of flip flop need at least one “RS” memory element. This element is made of two NOR or two NAND where the output of one goes to the input of the other and vice versa. So, for reliable operation, the two gate need continuous glitch free power.

Why NAND based SR latch is preferred over NOR based?

In general, cells are designed to have similar drive strength of pull up and pull down structures to have comparable rise and fall time. NAND gate has better ratio of output high drive and output low drive as compared to NOR gate. Hence NAND gate is preferred over NOR.

Which logic gates can be used to make SR flip flop?

The NAND Gate SR Flip-Flop We can implement the set-reset flip flop by connecting two cross-coupled 2-input NAND gates together. In the SR flip flop circuit, from each output to one of the other NAND gate inputs, feedback is connected.

What is the difference between the NAND and NOR implementations of an SR latch?

From the truth table, we see that the main difference between this implementation and the NAND implementation is that for the NOR implementation, the S and R inputs are active high, so that setting S to 1 will set the latch and setting R to 1 will reset the latch.

How a SR latch can be implemented using NAND gates?

This unstable condition is generally known as its Meta-stable state. Then, a simple NAND gate SR flip-flop or NAND gate SR latch can be set by applying a logic “0”, (LOW) condition to its Set input and reset again by then applying a logic “0” to its Reset input.

Which condition is not used in a NAND based SR latch?

Explanation: In a NAND based S-R latch, If S’=0 & R’=0 then both the outputs (i.e. Q & Q’) goes HIGH and this condition is called an ambiguous/forbidden state. This state is also known as an Invalid state as the system goes into an unexpected situation.

What is SR latch using NOR gate?

Latches are level-sensitive devices. Latches are useful for the design of the asynchronous sequential circuit. SR (Set-Reset) Latch – SR Latch is a circuit with: (i) 2 cross-coupled NOR gate or 2 cross-coupled NAND gate. (ii) 2 input S for SET and R for RESET.

What is NOR gate latch?

The time sequence at right shows the conditions under which the set and reset inputs cause a state change, and when they don’t. The function of such a circuit is to “latch” the value created by the input signal to the device and hold that value until some other signal changes it. …