Microsoft Word - Digital Logic Design v_4_6a

 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