T flip flops circuit can also be made by altering or modifying JK flip flops.
In most of the T flip flops circuit we study, we only consider the negative edge-triggered flip flops. Because the change in their state is only brought when the value is 1. These types of flip flops are also known as level-triggered flip flops. When the change in the output occurs at the negative edge of the clock, then it is referred to as negative edge-triggered flip flops. What are negative edge-triggered T flip flop ? When the clock is not present at the positive edge, then it keeps the output value same that is it keeps it held in the same position, so no change occurs in the output value at the positive edge. In these positive edge-triggered flip flops circuit, the change in the output values occur when the clock is present at the positive edge, that is why they are referred to as positive edge-triggered flip flops. T flip flops are also referred to as positive edge-triggered flip flops, when the clock unit is present in the triangular form. 
What are positive edge-triggered T flip flop ? And, one more unit is present in this circuit that is the clock unit. The control input unit the T flip flop circuit is the ‘T’ unit.
So, basically when the circuit changes its state from one state output to the complement other state output, then this process is referred to as toggling. This movement which is known as toggle action is a fast movement due to the presence of toggles in it. Toggle means switching or moving from one state to another using a toggle action. The input unit of T flip flop is referred to as Trigger unit or the Toggle input unit. This type of circuits has only one input unit, unlike SR flip flop and JK flip flop. The ‘T’ in the T Flip flop stands for toggle, so it is also known as Toggle Flip flop or T flip flop. T flip flop are one of the sequential circuits.
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