# What is the meaning of preset and clear?

## What is the meaning of preset and clear?

Typically, they’re called preset and clear: When the preset input is activated, the flip-flop will be set (Q=1, not-Q=0) regardless of any of the synchronous inputs or the clock. When the clear input is activated, the flip-flop will be reset (Q=0, not-Q=1), regardless of any of the synchronous inputs or the clock.

### When CLK 1 J 1 and K 1 then J-K flip-flop output is?

Race Around Condition In JK Flip-flop – For J-K flip-flop, if J=K=1, and if clk=1 for a long period of time, then Q output will toggle as long as CLK is high, which makes the output of the flip-flop unstable or uncertain. This problem is called race around condition in J-K flip-flop.

When a flip-flop is reset its output will be?

Flip-flops are the Sequential circuit. Flip-flops can store a 1-bit of information. For flip-flop, its input can affect the output only when the enable signal changes (falling edge or rising edge). ​When a flip-flop is reset its output will be ​Q = 0, Q̅ = 1.

When J and K inputs are low state of outputs Q and Q are?

If inputs J and K are both LOW, (J = K = 0), then there will be no change in Q no matter how many times the clock pulse is applied. If J = 0 (LOW) and K = 1 (HIGH) the next clock edge resets Q output LOW (Q = 0). If J = 1 and K = 0, then the next clock edge sets Q output HIGH (Q = 1).

## What is preset and clear in counter?

In the kind of counter circuit you’re talking about, “PRESET” or “SET” generally refers to forcing an output stage to a logical “1”, and “CLEAR” or “RESET” generally refers to forcing an output stage to a logical “0”.

### When two asynchronous active low input preset and clear are applied to J-K flip-flop the output will be?

If the preset input is active low, then the output of the flip-flop is set to one. If the clear input is active low, then the output of the flip-flop is reset to 0.

What does it mean when a latch is transparent?

A “transparent latch” is one where the inputs are passed straight through to the outputs when the “select” signal is active. When the select signal goes inactive, the final input state is latched on the outputs.

What kind of operation occurs in a J-K flip-flop when both inputs J and K are equal to 1?

toggled
Detailed Solution. In the above truth table when J = K = 1, its output is toggled.