T Flip-Flop

Level-sensitive

Describes the digital element that changes state continuously during the active clock level

In other words the output follows the input while the CLK(Enable) is active.

Edge-triggered

Describes the digital element whose output changes only on a clock edge (0→1 or 1→0)

Their state changes once per clock cycle.

Toggle

What does the T stands for in the T-Flip Flop?

T Flip-Flop

A storage element that toggles its output state only each clock edge when T = 1, and holds its state when T = 1.

Positive-edge-triggered D flip-flop

T flip-flop is based on what?

T flip-flop implementation

• Input D is fed by Q or Q’ which is controlled by T.

• T = 0 → D = Q → Q(t+1) = Q(t) [Hold]

• T = 1 → D = Q’ → Q(t+1) = Q’(t) [Toggle]

Characteristic Table (Q at t+1)

• T = 0 → Q(t+1) = Q(t)

• T = 1 → Q(t+1) = Q’(t)

counters

T flip-flops are widely used in building _______ because of its toggling behavior.

D Flip-Flop

• Input: D (data)

• On clock edge: Q(t+1) = D

• Stores the exact value of the data input.

• Is a general-purpose storage element.

T (Toggle control)

Input of the T flip-flop