Toggle or T Flip Flops
Using a JK flip-flop to implement a negative-edge-triggered T flip-flop:
Using D flip-flop to implement a positive-edge-triggered T flip-flop:
1D
C1
D=Q +
Q
Q’
T
CLK
S
1J
C1
1K
R
PRE’
T
CLK
CLR’
Q
Q’
J=K=T Q+ Comment
0 0 0 Q no Change
0 1 Invalid
1 0 Invalid
1 1 1 Q’ toggle
Symbol
S
1T
C1
R
PRE’
T
CLK
CLR’
Q
Q’
T Q + Comment
0 Q no Change
1 Q’ toggle
Symbo l
Characteristic equation : Q + = T’.Q + T.Q’
Characteristic Table