Semiconductor Components Industries, LLC, 2000
March, 2000 – Rev. 8
1 Publication Order Number:
MC74HC74A/D
MC74HC74A
Dual D Flip-Flop with Set
and Reset
High–Performance Silicon–Gate CMOS
The MC74HC74A is identical in pinout to the LS74. The device
inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LSTTL 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.
• Output Drive Capability: 10 LSTTL Loads
• 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
• In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
• Chip Complexity: 128 FETs or 32 Equivalent Gates
LOGIC DIAGRAM
RESET 1
DATA 1
CLOCK 1
SET 1
RESET 2
DATA 2
CLOCK 2
SET 2
1
2
3
4
13
12
11
10
5
6
9
8
Q1
Q1
Q2
Q2
PIN 14 = VCC
PIN 7 = GND
FUNCTION TABLE
Inputs Outputs
Set Reset Clock Data Q Q
LH XX HL
HL XX LH
L L X X H* H*
HH H HL
HH L LH
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 high simultaneously.
Device Package Shipping
ORDERING INFORMATION
MC74HC74AN PDIP–14 2000 / Box
MC74HC74AD SOIC–14
http://onsemi.com
55 / Rail
MC74HC74ADR2 SOIC–14 2500 / Reel
MARKING
DIAGRAMS
A = Assembly Location
WL or L = Wafer Lot
YY or Y = Year
WW or W = Work Week
MC74HC74ADT TSSOP–14 96 / Rail
MC74HC74ADTR2 TSSOP–14
2500 / Reel
TSSOP–14
DT SUFFIX
CASE 948G
HC
74A
ALYW
1
14
1
14
PDIP–14
N SUFFIX
CASE 646
MC74HC74AN
AWLYYWW
SOIC–14
D SUFFIX
CASE 751A
1
14
HC74A
AWLYWW
PIN ASSIGNMENT
SET 1
CLOCK 1
DATA 1
RESET 1
11
12
13
14
8
9
105
4
3
2
1
7
6
SET 2
CLOCK 2
DATA 2
RESET 2
V
CC
Q2
Q2
GND
Q1
Q1
MC74HC74A
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2
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, VCC and GND Pins
Power Dissipation in Still Air, Plastic DIP†
SOIC Package†
TSSOP Package†
Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP, SOIC or TSSOP Package)
_
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
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
DC Supply Voltage (Referenced to GND)
DC Input Voltage, Output Voltage (Referenced to GND)
Operating Temperature, All Package Types
Input Rise and Fall Time VCC = 2.0 V
(Figures 1, 2, 3) VCC = 3.0 V
VCC = 4.5 V
VCC = 6.0 V
ns
DC ELECTRICAL CHARACTERISTICS (Voltages Referenced to GND)
Minimum High–Level Input
Voltage
V
out
= 0.1 V or VCC – 0.1 V
|I
out
| v 20 µA
Maximum Low–Level Input
Voltage
V
out
= 0.1 V or VCC – 0.1 V
|I
out
| v 20 µA
Minimum High–Level Output
Voltage
Vin = VIH or V
IL
|I
out
| v 20 µA
Vin = VIH or VIL|I
out
| v 2.4 mA
|I
out
| v 4.0 mA
|I
out
| v 5.2 mA
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, Vin and
V
out
should be constrained to the
range GND v (Vin or V
out
) v VCC.
Unused inputs must always be
tied to an appropriate logic voltage
level (e.g., either GND or VCC).
Unused outputs must be left open.
MC74HC74A
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DC ELECTRICAL CHARACTERISTICS (Voltages Referenced to GND)
Maximum Low–Level Output
Voltage
Vin = VIH or V
IL
|I
out
| v 20 µA
Vin = VIH or VIL|I
out
| v 2.4 mA
|I
out
| v 4.0 mA
|I
out
| v 5.2 mA
Maximum Input Leakage
Current
Maximum Quiescent Supply
Current (per Package)
Vin = VCC or GND
I
out
= 0 µA
µA
NOTE: Information on typical parametric values can be found in Chapter 2 of the ON Semiconductor High–Speed CMOS Data Book
(DL129/D).
AC ELECTRICAL CHARACTERISTICS (C
L
= 50 pF, Input tr = tf = 6.0 ns)
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
pF
NOTE: For propagation delays with loads other than 50 pF, and information on typical parametric values, see Chapter 2 of the ON
Semiconductor High–Speed CMOS Data Book (DL129/D).
Typical @ 25°C, VCC = 5.0 V
C
PD
Power Dissipation Capacitance (Per Flip–Flop)*
32
pF
*Used to determine the no–load dynamic power consumption: PD = CPD V
CC
2
f + ICC VCC. For load considerations, see Chapter 2 of the
ON Semiconductor High–Speed CMOS Data Book (DL129/D).