CD54HC74 Datasheet, PDF (2/8 Pages) Texas Instruments – Dual D Flip-Flop with Set and Reset Positive-Edge Trigger

CD54HC74, CD74HC74, CD74HCT74
Functional Diagram
1
RESET
2
DATA
3
CLOCK
4
SET
13
RESET
12
DATA
11
CLOCK
10
SET
R
D
F/F 1
CP
S
R
D
F/F 2
CP
S
5
Q
6
Q
9
Q
8
Q
GND = PIN 7
V_CC = PIN 14
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 3)
H (Note 3)
H
H
↑
H
H
L
H
H
↑
L
L
H
H
H
L
X
Q0
Q0
NOTE:
H = High Level (Steady State)
L = Low Level (Steady State)
X = Don’t Care
↑ = Low-to-High Transition
Q0 = the level of Q before the indicated input conditions were established.
3. This configuration is nonstable, that is, it will not persist when set and reset inputs return to their inactive (high) level.
2