Q.1) Explain T flip flop.
Answer) Toggle flip flop is basically a J_K flip flop with its inputs tied together.Analyzing the circuit,
I) When CLK = ↓ , T = '0' / '1',
There is no change in the output.
II) When CLK = '0' , T = '0' / '1',
There is no change in the output.
III) When CLK = '1' , T = '0' / '1',
There is no change in the output.
IV) When CLK = ↑ , T = '0',
There is no change in the output ,as J = '0' and K = '0' .
READ : J-K Flip Flop
V) When CLK = ↑ , T = '1',
The output gets toggled, as J = '1' and K = '1'.
 |
| Truth table for T flip flop |
Q.2) Draw the excitation table for T flip flop.
Answer) From the truth table, we can infer the following points.When Q retains its state either from '0' to '0' or '1' to '1', T = '0'
When Q changes its state from '1' to '0' or '0' to '1', T ='1'.
 |
| Excitation table for T flip flop |
Q.3) Convert J-K flip flip to T flip flop.
Answer) Given flop : J-K flip flop (Output)
Flop to be derived : T flip flop (Input)
 |
| Combined truth table for converting J-K flip flop into T flip flop. |
K-Map Simplification
 |
| T flip flop using J-K flip flop |
Q.4) Convert S-R flip flop into T flip-flop.
Answer) Given flip flop : S-R flip flop (Output)
Flop to be derived : T flip flop (Input)
 |
| Combined truth table for converting S-R flip flop into T flip-flop |
 |
| T flip flop using S-R flip flop. |
Q.5) Convert D flip flop to T flip flop.
Answer) Given flop : D flip flop. (Output)
Flop to be derived : T flip flop (Input)
 |
| Combined truth table for converting D flip into T flip flop |
 |
| K-Map Simplification |
 |
| T flip flop using D flip flop |
Q.6) Convert T flip flop to D flip flop
Answer) Given flop : T flip flop
Flop to be derived : D flip flop.
 |
| Combined truth table for converting T flip flop into D flip flop |
 |
| K-Map Simplification |
 |
| D flip flop using T flip flop. |
Q.7) Convert T flip flop to S-R flip flop.
Answer) Given flop : T flip flop (Output)
Flop to be derived : S-R flip flop (Input)
 |
| Combined truth table for converting T flip flop into S-R flip flop. |
 |
| K-Map Simplification |
 |
| S-R flip flop using T flip-flop. |
Q.8) Convert T flip flop into J-K flip flop.
Answer) Given flop : T flip flop (Output).
Flop to be derived : J-K flip flop (Input)
 |
| Combined truth table for converting T flip flop into J-K flip flop. |
 |
| K-Map Simplification |
 |
| J-K flip flop using T flip flop. |
Interesting Fact : Full form of JK in J-K flip flop is Jack Kilby.
