The 74HC74 dual positive edge-triggered D-type flip-flop is basic in digital circuits, renowned for its precision in data storage and transmission. This article examines its dangerous features and functions, underlining separate inputs for data, clock, set, and reset that enhance its versatility and efficiency. It also covers how its outputs, Q and Q', facilitate complex designs, ensuring reliable and flexible digital systems. Learn more about the capabilities of the 74HC74 in enhancing digital circuitry.
Catalog
The 74HC74 is a dual positive edge-triggered D-type flip-flop with separate inputs for data (nD), clock (nCP), set (nSD), and reset (nRD), as well as complementary outputs nQ and nQ. It is designed for compatibility with standard CMOS outputs and can interface with LSTTL outputs through the use of pull-up resistors.
Technical specifications, attributes, parameters, and components of the ON Semiconductor 74HC74DR2G
:
Type
|
Parameter
|
Mount
|
Surface Mount
|
Mounting
Type
|
Surface Mount
|
Package /
Case
|
14-SOIC
(0.154, 3.90mm Width)
|
Number of
Pins
|
14
|
Clock-Edge
Trigger Type
|
Positive Edge
|
Operating
Temperature
|
-55°C to
125°C (TA)
|
Packaging
|
Tape &
Reel (TR)
|
Series
|
74HC
|
JESD-609
Code
|
e3
|
Part
Status
|
Obsolete
|
Moisture
Sensitivity Level (MSL)
|
1 (Unlimited)
|
Number of
Terminations
|
14
|
Type
|
D-Type
|
Terminal
Finish
|
Tin (Sn)
|
Packing
Method
|
Tape and Reel
|
Voltage -
Supply
|
2V to 6V
|
Terminal
Position
|
DUAL
|
Terminal
Form
|
GULL WING
|
Peak
Reflow Temperature (°C)
|
260
|
Supply
Voltage
|
3V
|
REACH
Compliance Code
|
Unknown
|
Time at
Peak Reflow Temperature
|
40 seconds
|
Base Part
Number
|
74HC74
|
Function
|
Set (Preset)
and Reset
|
Qualification
Status
|
Not Qualified
|
Output
Type
|
Differential
|
Polarity
|
Non-Inverting
|
Supply
Voltage - Max (Vsup)
|
6V
|
Supply
Voltage - Min (Vsup)
|
2V
|
Number of
Circuits
|
2
|
Load
Capacitance
|
50pF
|
Output
Current
|
5.2mA
|
Clock
Frequency
|
28MHz
|
Propagation
Delay
|
100ns
|
Turn On
Delay Time
|
21ns
|
Family
|
HC/UH
|
Logic
Function
|
AND, D-Type
|
Current -
Quiescent (Iq)
|
2μA
|
Max I(ol)
|
0.004A
|
Number of
Bits per Element
|
1
|
Max
Propagation Delay
|
17ns @ 6V,
50pF
|
Trigger
Type
|
Positive Edge
|
Input
Capacitance
|
10pF
|
Number of
Output Lines
|
1
|
Length
|
8.65mm
|
Width
|
3.9mm
|
RoHS
Status
|
RoHS
Compliant
|
Lead Free
|
Lead Free
|
Parameter
|
Details
|
Output
Drive Capability
|
10 LSTTL
Loads
|
Direct
Interface Compatibility
|
Outputs
directly interface to CMOS, NMOS, and TTL
|
Operating
Voltage Range
|
2.0 to 6.0 V
|
Low Input
Current
|
1.0 A
|
High Noise
Immunity
|
Characteristic
of CMOS Devices
|
Compliance
|
In compliance
with JEDEC Standard No. 7A Requirements
|
ESD
Performance
|
HBM 2000 V;
Machine Model 200 V
|
Chip
Complexity
|
128 FETs or
32 Equivalent Gates
|
Pb-Free
Packages
|
Available
|
Counters and Frequency Dividers
In the digital electronics landscape, the 74HC74 flip-flop proves instrumental in crafting counters and frequency dividers. The devices capitalize on the flip-flop's capacity to switch states, allowing them to effectively count pulses and divide frequencies.
Shift Registers
Shift registers derive notable benefits from the 74HC74's capability to retain and transfer data sequentially. A line-up of flip-flops enables shift registers to perform tasks such as serial-to-parallel conversion and data storage, serving a wide range of applications.
Storage Registers
The 74HC74 plays a main role in storage registers by maintaining data states until a signal introduces changes. This function supports systems that demand consistent data retrieval or temporary data hold, as seen in memory units within microcontrollers.
The datasheet specifies that the IC's power supply, VDD, varies from 0 to +7V, as illustrated in the snapshot below. To manage the supply and DC output voltage, the source was restricted to 5V using an LED on the output. An LM7805 regulator was employed to control the voltage of the LED.
Symbol
|
Parameter
|
Value
|
Unit
|
Vcc
|
DC Supply
Voltage (Referenced to GND)
|
-0.5 to +7.0
|
V
|
Vin
|
DC Input
Voltage (Referenced to GND)
|
-1.5 to Vcc +
1.5
|
V
|
Vout
|
DC Output
Voltage (Referenced to GND)
|
-0.5 to Vcc +
0.5
|
V
|
Iin
|
DC Input
Current, per Pin
|
±20
|
mA
|
Iout
|
DC Output
Current, per Pin
|
±25
|
mA
|
Icc
|
DC Supply
Current, Vcc and GND Pins
|
±50
|
mA
|
Parameters
|
74HC74DR2G
|
SN74HC74D
|
MC74HC74ADR2G
|
MC74HC74ADG
|
MC74HC74AF
|
Manufacturer
|
ON
Semiconductor
|
Texas
Instruments
|
ON
Semiconductor
|
ON
Semiconductor
|
ON
Semiconductor
|
Package /
Case
|
14-SOIC
(0.154, 3.90mm Width)
|
14-SOIC
(0.154, 3.90mm Width)
|
14-SOIC
(0.154, 3.90mm Width)
|
14-SOIC
(0.154, 3.90mm Width)
|
14-SOIC
(0.209, 5.30mm Width)
|
Number of
Pins
|
14
|
14
|
14
|
14
|
14
|
Logic
Function
|
AND, D-Type
|
AND, D-Type,
Flip-Flop
|
AND, D-Type,
Flip-Flop
|
AND, D-Type,
Flip-Flop
|
AND, D-Type,
Flip-Flop
|
Number of
Bits per Element
|
1
|
1
|
1
|
1
|
-
|
Propagation
Delay
|
100 ns
|
160 ns
|
160 ns
|
15 ns
|
100 ns
|
Clock Edge
Trigger Type
|
Positive Edge
|
Positive Edge
|
Positive Edge
|
Positive Edge
|
Positive Edge
|
Supply
Voltage
|
3 V
|
3 V
|
3 V
|
5 V
|
3 V
|
Technology
|
CMOS
|
CMOS
|
CMOS
|
CMOS
|
CMOS
|
ON Semiconductor is a leader in energy-efficient technologies, notably impacting the automotive and aerospace industries with its advanced semiconductor solutions. The company is committed to sustainable practices, helping to reduce carbon footprints and meet global sustainability goals. Strategic alliances bolster their innovative capabilities, positioning ON Semiconductor at the forefront of technological advancements. Their robust product line, including the 74HC74, which operates with a power supply range of 0 to +7V, showcases their commitment to versatile and high-performance solutions.
Datasheet PDF
74HC74DR2G Datasheets:
74HC74DR2G.pdf
74HC74DR2G Details PDF
74HC74DR2G Details PDF for FR.pdf
74HC74DR2G Details PDF for IT.pdf
74HC74DR2G Details PDF for ES.pdf
74HC74DR2G Details PDF for DE.pdf
74HC74DR2G Details PDF for KR.pdf
MC74HC74ADR2G Datasheets:
MC74HC74ADR2G.pdf
MC74HC74ADR2G Details PDF
MC74HC74ADR2G Details PDF for FR.pdf
MC74HC74ADR2G Details PDF for KR.pdf
MC74HC74ADR2G Details PDF for IT.pdf
MC74HC74ADR2G Details PDF for ES.pdf
MC74HC74ADR2G Details PDF for DE.pdf
MC74HC74ADG Datasheets:
MC74HC74ADG.pdf
MC74HC74ADG Details PDF
MC74HC74ADG Details PDF for KR.pdf
MC74HC74ADG Details PDF for IT.pdf
MC74HC74ADG Details PDF for ES.pdf
MC74HC74ADG Details PDF for DE.pdf
MC74HC74ADG Details PDF for FR.pdf
Frequently Asked Questions [FAQ]
1. Can you explain the functioning of the 74HC74?
The 74HC74 has the same pinout as the LS74 and is compatible with standard CMOS outputs. With the addition of pull-up resistors, it can also work with LSTTL outputs. This device includes two D-type flip-flops, each with separate Set, Reset, and Clock inputs.
2. What purpose does a flip-flop serve in electronics?
A flip-flop, or latch, is a type of circuit used in electronics that maintains one of two stable states, effectively storing state information. This bistable multivibrator can switch states through signals received at its control inputs and has one or two outputs.
3. What is the operating voltage range for the 74HC74?
The operating voltage range for the 74HC74 is between 2.7 V and 3.6 V.
4. What are the inputs and outputs of a D flip-flop?
A D flip-flop includes a clock (CLK) and a data (D) input. It also features two outputs: the main output (Q) and its complement (Q').
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