Philips Semiconductors
Product Specification
Dual D-type flip-flop with set and reset;
positive-edge trigger
74LVC74A
PIN DESCRIPTION
PIN
NUMBER
1, 13
2, 12
3, 11
4, 10
5, 9
6, 8
7
14
SYMBOL
1R
D
, 2R
D
1D, 2D
1CP, 2CP
1S
D
, 2S
D
1Q, 2Q
1Q, 2Q
GND
V
CC
NAME AND FUNCTION
Asynchronous reset-direct input
(active LOW)
Data inputs
Clock input (LOW-to-HIGH, edge
triggered)
Asynchronous set-direct input (active
LOW)
True flip-flop outputs
Complement flip-flop outputs
Ground (0 V)
Positive supply voltage
FUNCTION TABLE
INPUTS
S
D
L
H
L
R
D
H
L
L
INPUTS
S
D
H
H
R
D
H
H
CP
°
°
D
L
H
CP
X
X
X
D
X
X
X
OUTPUTS
Q
H
L
H
Q
L
H
H
OUTPUTS
Q
n+1
L
H
Q
n+1
H
L
LOGIC SYMBOL
4 10
1S
D
2S
D
S
D
2 1D
1Q
D
Q
12 2D
2Q
3 1CP
FF
CP
11 2CP
1Q
Q
2Q
R
D
1R
D
2R
D
1 13
5
9
5
9
NOTES:
H = HIGH voltage level
L = LOW voltage level
X = don“t care
°
= LOW-to-HIGH CP transition
Q
n+1
= state after the next LOW-to-HIGH CP transition
FUNCTIONAL DIAGRAM
4
2
3
1S D
1D
1CP
D
SD
Q
1Q
5
CP FF1
Q
RD
1Q
6
SV00492
1 1R D
10
12
11
2S D
2D
2CP
D
SD
Q
2Q
9
CP FF2
Q
RD
2Q
8
13 2R
D
SV00494
1998 Jun 17
3
PHILIPS [ NXP SEMICONDUCTORS ]
