TECHNICAL DATA
IN74HC74A
Dual D Flip-Flop with Set and Reset
The IN74HC74A is identical in pinout to the LS/ALS74. The device inputs
are compatible with standard CMOS outputs; with pullup resistors, they are
compatible with LS/ALSTTL outputs.
This device consists of two D flip-flops with individual Set, Reset, and
Clock inputs. Information at a D-input is transferred to the corresponding Q
output on the next positive going edge of the clock input. Both Q and Q
outputs are available from each flip-flop. The Set and Reset inputs are
asynchronous.
•
Outputs Directly Interface to CMOS, NMOS, and TTL
•
Operating Voltage Range: 2.0 to 6.0 V
•
Low Input Current: 1.0
µA
•
High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
IN74HC74AN Plastic
IN74HC74AD SOIC
T
A
= -55° to 125° C for all packages
LOGIC DIAGRAM
PIN ASSIGNMENT
FUNCTION TABLE
Inputs
Set
L
H
L
PIN 14 =V
CC
PIN 7 = GND
H
H
H
H
Reset
H
L
L
H
H
H
H
L
H
Clock
X
X
X
Data
X
X
X
H
L
X
X
Outputs
Q
H
L
H
*
H
L
Q
L
H
H
*
L
H
No Change
No Change
H
H
X
No Change
*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.
X = don’t care
Rev. 00
IN74HC74A
MAXIMUM RATINGS
*
Symbol
V
CC
V
IN
V
OUT
I
IN
I
OUT
I
CC
P
D
Tstg
T
L
*
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output 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, Plastic DIP
**
SOIC Package
**
Storage Temperature
Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)
Value
-0.5 to +7.0
-1.5 to V
CC
+1.5
-0.5 to V
CC
+0.5
±20
±25
±50
750
500
-65 to +150
260
Unit
V
V
V
mA
mA
mA
mW
°C
°C
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
**
Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
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 (Figure 1)
V
CC
=2.0 V
V
CC
=4.5 V
V
CC
=6.0 V
Min
2.0
0
-55
0
0
0
Max
6.0
V
CC
+125
1000
500
400
Unit
V
V
°C
ns
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 circuit. For proper operation, V
IN
and V
OUT
should be constrained to the range GND≤(V
IN
or
V
OUT
)≤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.
Rev. 00
IN74HC74A
DC ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND)
Symbol
Parameter
Test Conditions
V
CC
V
Guaranteed Limit
25
°C
to
-55°C
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
3.98
5.48
0.1
0.1
0.1
0.26
0.26
±0.1
2.0
≤85
°C
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
3.84
5.34
0.1
0.1
0.1
0.33
0.33
±1.0
20
≤125
°C
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
3.7
5.2
0.1
0.1
0.1
0.4
0.4
±1.0
80
µA
µA
V
V
Unit
V
IH
Minimum High-
Level Input Voltage
Maximum Low -
Level Input Voltage
Minimum High-
Level Output Voltage
V
OUT
=0.1 V or V
CC
-0.1 V
⎢I
OUT
⎢≤
20
µA
V
OUT
=0.1 V or V
CC
-0.1 V
⎢I
OUT
⎢ ≤
20
µA
V
IN
=V
IH
or V
IL
⎢I
OUT
⎢ ≤
20
µA
V
IN
=V
IH
or V
IL
⎢I
OUT
⎢ ≤
4.0 mA
⎢I
OUT
⎢ ≤
5.2 mA
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
6.0
6.0
V
IL
V
V
OH
V
V
OL
Maximum Low-
Level Output Voltage
V
IN
=V
IH
or V
IL
⎢I
OUT
⎢ ≤
20
µA
V
IN
=V
IH
or V
IL
⎢I
OUT
⎢ ≤
4.0 mA
⎢I
OUT
⎢ ≤
5.2 mA
I
IN
I
CC
Maximum Input
Leakage Current
Maximum Quiescent
Supply Current
(per Package)
V
IN
=V
CC
or GND
V
IN
=V
CC
or GND
I
OUT
=0µA
Rev. 00
IN74HC74A
AC ELECTRICAL CHARACTERISTICS
(C
L
=50pF,Input t
r
=t
f
=6.0 ns)
Symbol
Parameter
V
CC
V
Guaranteed Limit
25
°C
to
-55°C
6.0
30
35
100
20
17
105
21
18
75
15
13
10
≤85°C
≤125°C
Unit
f
max
Maximum Clock Frequency (50% Duty Cycle)
(Figures 1 and 4)
Maximum Propagation Delay, Clock to Q or Q
(Figures 1 and 4)
Maximum Propagation Delay, Set or Reset to Q or
Q (Figures 2 and 4)
Maximum Output Transition Time, Any Output
(Figures 1 and 4)
Maximum Input Capacitance
Power Dissipation Capacitance (Per Flip-Flop)
Used to determine the no-load dynamic power
consumption:
P
D
=C
PD
V
CC2
f+I
CC
V
CC
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
-
4.8
24
28
125
25
21
130
26
22
95
19
16
10
4.0
20
24
150
30
26
160
32
27
110
22
19
10
MHz
t
PLH
, t
PHL
ns
t
PLH
, t
PHL
ns
t
TLH
, t
THL
ns
C
IN
C
PD
pF
pF
Typical @25°C,V
CC
=5.0 V
39
TIMING REQUIREMENTS
(C
L
=50pF,Input t
r
=t
f
=6.0 ns)
Symbol
Parameter
V
CC
V
Guaranteed Limit
25
°C
to-
55°C
80
16
14
3.0
3.0
3.0
8.0
8.0
8.0
60
12
10
60
12
10
1000
500
400
≤85°C
≤125°C
Unit
t
su
Minimum Setup Time, Data to Clock (Figure 3)
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
100
20
17
3.0
3.0
3.0
8.0
8.0
8.0
75
15
13
75
15
13
1000
500
400
120
24
20
3.0
3.0
3.0
8.0
8.0
8.0
90
18
15
90
18
15
1000
500
400
ns
t
h
Minimum Hold Time, Clock to Data (Figure 3)
ns
t
rec
Minimum Recovery Time, Set or Reset Inactive to
Clock (Figure 2)
Minimum Pulse Width, Clock (Figure 1)
ns
t
w
ns
t
w
Minimum Pulse Width, Set or Reset (Figure 2)
ns
t
r
, t
f
Maximum Input Rise and Fall Times (Figure 1)
ns
Rev. 00
IN74HC74A
Figure 1. Switching Waveform
Figure 2. Switching Waveform
Figure 3. Switching Waveform
Figure 4.Test Circuit
EXPANDED LOGIC DIAGRAM
Rev. 00
51单片机
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