2

Functional Diagram

TRUTH TABLE

INPUTS

OUTPUTS

SET

RESET

CP

D

Q

Q

LH

X

X

H

L

HL

X

X

L

H

L

L

X

X

H (Note 5) H (Note 5)

HH

↑

HH

L

HH

↑

LL

H

HH

L

X

Q0

Q0

NOTES:

3. H = High level (steady state), L = Low level (steady state), X =

Don’t care,

↑ = Transition from Low to High level.

4. Q0 = the level of Q before the indicated input conditions were es-

tablished.

5. This configuration is nonstable, that is, it will not persist when set

and reset inputs return to their inactive (high) level.

1R

1

2

3

4

5

6

1D

1CP

1S

1Q

1Q

2R

13

12

11

10

9

8

2D

2CP

2S

2Q

2Q

R

D

CP

S

FF1

R

D

CP

S

FF2

CD74AC74, CD74ACT74