CD74AC74 Datasheet, PDF (2/8 Pages) Texas Instruments – Dual D-Type Flip-Flop with Set and Reset Positive-Edge-Triggered

CD74AC74, CD74ACT74
Functional Diagram
1
1R
2
1D
3
1CP
4
1S
13
2R
12
2D
11
2CP
10
2S
R
D
FF1
CP
S
R
D
FF2
CP
S
5
1Q
6
1Q
9
2Q
8
2Q
TRUTH TABLE
INPUTS
OUTPUTS
SET RESET CP
D
Q
Q
L
H
X
X
H
L
H
L
X
X
L
H
L
L
X
X H (Note 5) H (Note 5)
H
H
↑
H
H
L
H
H
↑
L
L
H
H
H
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.
2