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Dual D Flip-Flop with Set and Reset
High-Speed Silicon-Gate CMOS
The IN74AC74 is identical in pinout to the LS/ALS74,
HC/HCT74. The device inputs are compatible with standard CMOS
outputs; with pullup resistors, they are compatible with LS/ALS
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; 0.1 µA @ 25°C
•
High Noise Immunity Characteristic of CMOS Devices
•
Outputs Source/Sink 24 mA
TECHNICAL DATA
IN74AC74
ORDERING INFORMATION
IN74AC74N Plastic
IN74AC74D SOIC
TA = -40° to 85° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 14 =V
PIN 7 = GND
CC
FUNCTION TABLE
Inputs Outputs
Set Reset Clock Data Q Q
LH X XHL
HL X XLH
LL X XH*H
HH HHL
HH LLH
H H L X No Change
H H H X 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 hi gh
simultaneously.
X = don’t care
*
99
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IN74AC74
MAXIMUM RATINGS
*
Symbol Parameter Value Unit
V
CC
V
V
OUT
I
IN
I
OUT
I
CC
P
DC Supply Voltage (Referenced to GND) -0.5 to +7.0 V
DC Input Voltage (Referenced to GND) -0.5 to VCC +0.5 V
IN
DC Output Voltage (Referenced to GND) -0.5 to VCC +0.5 V
DC Input Current, per Pin
DC Output Sink/Source Current, per Pin
DC Supply Current, VCC and GND Pins
Power Dissipation in Still Air, Plastic DIP+
D
SOIC Package+
±
20
±
50
±
50
750
500
Tstg Storage Temperature -65 to +150
T
Lead Temperature, 1 mm from Case for 10 Seconds
L
260
(Plastic DIP or SOIC Package)
*
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
mA
mA
mA
mW
°
C
°
C
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Max Unit
V
CC
VIN, V
T
J
T
A
I
OH
I
OL
tr, t
f
*
V
from 30% to 70% V
IN
This device c ontains p rote ction ci rcuitr y to guard a gainst damage d ue to high st atic voltages or electr ic
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
GND≤(V
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V
Unused outputs must be left open.
DC Supply Voltage (Referenced to GND) 2.0 6.0 V
DC Input Voltage, Output Voltage (Referenced to GND) 0 V
OUT
Junction Temperature (PDIP) 140
Operating Temperature, All Package Types -40 +85
Output Current - High -24 mA
Output Current - Low 24 mA
Input Rise and Fall Time
(except Schmitt Inputs)
IN
or V
OUT
)≤VCC.
CC
*
V
V
V
=3.0 V
CC
=4.5 V
CC
=5.5 V
CC
and V
IN
0
0
0
should be constrained to the range
OUT
150
40
25
CC
V
°
C
°
C
ns/V
CC
).
100
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IN74AC74
DC ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND)
Symbol Parameter Test Conditions V
V
Minimum High-Level
IH
V
=0.1 V or VCC-0.1 V 3 .0
OUT
Input Voltage
V
Maximum Low -
IL
V
=0.1 V or VCC-0.1 V 3 .0
OUT
Level Input Voltage
V
OH
Minimum High-Level
I
OUT
≤ -50 µA
Output Voltage
*
VIN=VIH or V
IL
IOH=-12 mA
I
=-24 mA
OH
I
=-24 mA
OH
V
OL
Maximum Low-Level
I
OUT
≤ 50 µA
Output Voltage
*
VIN=VIH or V
IL
IOL=12 mA
I
=24 mA
OL
I
=24 mA
OL
I
IN
Maximum Input
VIN=VCC or GND 5.5
Leakage Current
I
OLD
+Minimum Dynamic
V
=1.65 V Max 5.5 75 mA
OLD
Output Current
I
OHD
+Minimum Dynamic
V
=3.85 V Min 5.5 -75 mA
OHD
Output Current
I
CC
Maximum Quiescent
VIN=VCC or GND 5.5 4.0 40
Supply Current
(per Package)
*
All outputs loaded; thresholds on input associated with output under test.
+Maximum test duration 2.0 ms, one output loaded at a time.
Note: I
IN
and I
@ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V V
CC
V
4.5
5.5
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
CC
Guaranteed Limits
25 °C-40
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.1
0.1
0.1
0.36
0.36
0.36
±
0.1
°
C to
85°C
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.46
3.76
4.76
0.1
0.1
0.1
0.44
0.44
0.44
±
1.0
CC
Unit
V
V
V
V
µ
A
µ
A
101
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IN74AC74
AC ELECTRICAL CHARACTERISTICS
(CL=50pF,Input tr=tf=3.0 ns)
Symbol Parameter V
f
t
max
PLH
Clock Frequency (Fi gure 1) 3.3
Propagation Delay, Clock to Q or Q
(Figure 1)
t
PHL
Propagation Delay, Clock to Q or Q
(Figure 1)
t
PLH
Propagation Delay, Set or Reset to Q or Q
(Figure 2)
t
PHL
Propagation Delay, Set or Reset to Q or Q
(Figure 2)
C
IN
C
PD
*
Voltage Range 3.3 V is 3.3 V ±0.3 V
Maximum Input Capacitance 5.0 4.5 4.5 pF
Power Dissipation Capacitance 35 pF
Voltage Range 5.0 V is 5.0 V ±0.5 V
*
V
CC
Guaranteed Limits
25 °C-40
Min Max Min Max
100
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
140
4.5
3.5
3.5
2.5
5.0
3.5
4.0
3.0
13.5
10.0
14.0
10.0
12.5
9.0
12.0
9.5
Typical @25°C,VCC=5.0 V
95
125
4.0
3.0
3.5
2.5
4.0
3.0
3.5
2.5
°
C to
85°C
16.0
10.5
14.5
10.5
13.0
10.0
13.5
10.5
Unit
MHz
ns
ns
ns
ns
TIMING REQUIREMENTS
(CL=50pF,Input tr=tf=3.0 ns)
Symbol Parameter V
t
su
Minimum Set up Time, Data to Cl ock
(Figure 3)
t
h
Minimum Hold Time, C lock to Data
(Figure 3)
t
w
Minimum Pulse Width, Cloc k, Set or Reset
(Figures 1,2)
t
rec
Minimum Rec overy Time, Se t or Reset to
Clock (Figure 2)
*
Voltage Range 3.3 V is 3.3 V ±0.3 V
Voltage Range 5.0 V is 5.0 V ±0.5 V
V
CC
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
*
Guaranteed Limits
25 °C-40
°
C to
Unit
85°C
4.0
3.0
0.5
0.5
5.5
4.5
0
0
4.5
3.0
0.5
0.5
7.0
5.0
0
0
ns
ns
ns
ns
102
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IN74AC74
Figure 1. Switching Waveform Figure 2. Switching Waveform
Figure 3. Switching Waveform
EXPANDED LOGIC DIAGRAM
103
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