Note: Since the CLOCK is HIGH to LOW edge triggered, both input button should be pressed and hold till releasing the CLOCK button.īelow we have described the various states of T Flip-Flop using a Breadboard circuit with ICMC74HC73A. The LEDs used are current limited using 220Ohm resistor. Thus, the initial state according to the truth table is as shown above. Hence, default input state will be LOW across all the pins except R which is in High state for normal operation. The pins T, CLK are normally pulled down and pin R is pulled up. Thus, for HIGH and LOW inputs at T the corresponding output can be seen through LED Q and Q’. Hence, the regulated 5V output is used as the Vcc and pin supply to the IC. The 9V battery acts as the input to the voltage regulator LM7805. The two LEDs Q and Q’ represents the output states of the flip-flop. The buttons T(Toggle), R(Reset), CLK(Clock) are the inputs for the T flip-flop. We have used a LM7805 regulator to limit the LED voltage. Also we have used LED at output, the source has been limited to 5V to control the supply voltage and DC output voltage. The IC power source V DD ranges from 0 to +7V and the data is available in the datasheet. T Flip-flop Circuit diagram and Explanation:
![d flip flop logicworks 5 d flip flop logicworks 5](https://sub.allaboutcircuits.com/images/quiz/03452x03.png)
The J and K inputs will be shorted and used as T input. Above are the pin diagram and the corresponding description of the pins. The IC used is MC74HC73A (Dual JK-type flip-flop with RESET). It is a 14 pin package which contains 2 individual JK flip-flop inside. Hence, this pin always pulled up and can be pulled down only when needed. All the pins will become inactive upon LOW at RESET pin. This, works unlike SR flip Flop & JK flip-flop for the complimentary inputs.
![d flip flop logicworks 5 d flip flop logicworks 5](https://i.ytimg.com/vi/HTRiIVZ8DpQ/maxresdefault.jpg)
But, the important thing to consider is all these can occur only in the presence of the clock signal. According to the table, based on the input the output changes its state. The Q and Q’ represents the output states of the flip-flop. The T flip flop is the modified form of JK flip flop. Thus, the output has two stable states based on the inputs which have been discussed below. Thus, T flip-flop is a controlled Bi-stable latch where the clock signal is the control signal. The clock has to be high for the inputs to get active. Whenever the clock signal is LOW, the input is never going to affect the output state.
![d flip flop logicworks 5 d flip flop logicworks 5](https://image.ceneostatic.pl/data/products/117270338/aaa157db-5c6d-4992-84f0-a2ab55222357_i-flip-flop-kapcie.jpg)
T flip flop is modified form of JK flip-flop making it to operate in toggling region. The major applications of T flip-flop are counters and control circuits. The name T flip-flop is termed from the nature of toggling operation. Here in this article we will discuss about T Flip Flop. Out of the above types only JK and D flip-flops are available in the integrated IC form and also used widely in most of the applications.