74HC74
PIN ASSIGNMENT
RESET 1
DATA 1
CLOCK 1
SET 1
Q1
Q1
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
RESET 2
DATA 2
CLOCK 2
SET 2
Q2
Q2
RESET 2
DATA 2
CLOCK 2
SET 2
RESET 1
DATA 1
CLOCK 1
SET 1
LOGIC DIAGRAM
1
2
3
4
13
12
11
10
PIN 14 = V
CC
PIN 7 = GND
9
8
Q2
Q2
5
6
Q1
Q1
FUNCTION TABLE
Inputs
Set Reset Clock Data
L
H
L
H
H
H
H
H
H
L
L
H
H
H
H
H
X
X
X
X
X
X
H
L
X
X
X
Outputs
Q
Q
H
L
L
H
H*
H*
H
L
L
H
No Change
No Change
No Change
L
H
*Both outputs will remain high as long as Set and Reset are low, but the output
states are unpredictable if Set and Reset go high simultaneously.
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
Symbol
V
CC
V
in
I
in
I
out
I
CC
P
D
T
stg
T
L
V
out
Parameter
Value
Unit
V
V
V
mA
mA
mA
mW
_C
_C
260
300
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Input Current, per Pin
DC Output Current, per Pin
DC Supply Current, V
CC
and GND Pins
Power Dissipation in Still Air,
Storage Temperature
Lead Temperature, 1 mm from Case for 10 Seconds
(SOIC or TSSOP Package)
SOIC Package†
TSSOP Package†
DC Output Voltage (Referenced to GND)
– 0.5 to + 7.0
– 0.5 to V
CC
+ 0.5
– 0.5 to V
CC
+ 0.5
±20
±25
±50
500
450
– 65 to + 150
MAXIMUM RATINGS
This device contains protection
circuitry to guard against damage
due to high static voltages or electric
fields. However, precautions must
be taken to avoid applications of any
voltage higher than maximum rated
voltages to this high−impedance cir-
cuit. For proper operation, V
in
and
V
out
should be constrained to the
range GND
v
(V
in
or V
out
)
v
V
CC
.
Unused inputs must always be
tied to an appropriate logic voltage
level (e.g., either GND or V
CC
).
Unused outputs must be left open.
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress
ratings only. Functional operation above the Recommended Operating Conditions is not implied.
Extended exposure to stresses above the Recommended Operating Conditions may affect device
reliability.
†Derating — SOIC Package: – 7 mW/_C from 65_ to 125_C
TSSOP Package:
−
6.1 mW/_C from 65_ to 125_C
For high frequency or heavy load considerations, see Chapter 2 of the ON Semiconductor High−Speed CMOS Data Book (DL129/D).
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
in
, V
out
T
A
t
r
, t
f
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage, Output Voltage (Referenced to GND)
Operating Temperature, All Package Types
Input Rise and Fall Time
(Figures 1, 2, 3)
V
CC
= 2.0 V
V
CC
= 3.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
Min
2.0
0
– 55
0
0
0
0
Max
6.0
V
CC
+ 125
1000
600
500
400
Unit
V
V
_C
ns
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