74LS74 Dual D Flip-Flop: How to Use it?

Sophie

Published: 12 November 2021 | Last Updated: 12 November 2021

18641

DM74LS74AN

DM74LS74AN

ON Semiconductor

4.75V~5.25V 20MHz D-Type Flip Flop 74LS74 8mA 74LS Series 14-DIP (0.300, 7.62mm)

Purchase Guide

4.75V~5.25V 20MHz D-Type Flip Flop 74LS74 8mA 74LS Series 14-DIP (0.300, 7.62mm)

74LS74 dual d flip-flop contains two independent positive-edge-triggered D flip-flops with complementary outputs. This article will unlock more details about 74LS74. There is a huge range of Semiconductors, Capacitors, Resistors and ICs in stock. Welcome RFQ.

This video talks about 74LS74.

Flip Flops D con 74LS74

74LS74 Pinout

74LS74 Pinout.jpg

74LS74 Pinout

Pin NumberPin   SymbolNameDescription
5,91Q   / 2QOutputOutput   Pin of the Flip Flop
6,81Q’(bar)   / 2Q’(bar)Complementary   OutputThe inverted output pin of Flip Flop
3, 111CLK   / 2CLKClock   Input PinThese   pins must be provided with a clock pulse for the flip flop
1,131CLR   (bar) / 2CLR (bar)Clear   DataResets   the flip flop by clearing its memory
2,121D   /2DData   Input PinInput   pin of the Flip Flop
4, 101PRE   (bar) / 2PRE (bar)PRE   InputAnother   Input pin for Flip Flop. Also referred to as a set pin
7VssGroundConnected   to the ground of the system
14Vdd/VccSupply   VoltagePowers   the IC typically with 5V


74LS74 CAD Model

Symbol

74LS74 Symbol.jpg

74LS74 Symbol

Footprint

74LS74 Footprint.jpg

74LS74 Footprint

3D Model

74LS74 3D Model.jpg

74LS74 3D Model

74LS74 Features

  • Dual D Flip Flop Package IC

  • Operating Voltage: 2V to 15V

  • Propagation Delay: 40nS

  • Minimum High-Level Input Voltage: 2 V

  • Maximum Low-Level Input Voltage: 0.8V

  • Operating Temperature: 0 to 70°C

  • High-Level Output Current: 8mA

  • Available in 14-pin SO-14, SOT42 packages


74LS74 Application

  • Used as Shift Registers

  • Memory/Control Registers

  • Buffer Circuits

  • Sampling Circuits

  • Latching devices


74LS74 Equivalent

The equivalents for 74LS74:

  • 74LVC2G80

  • HEF40312B


What is 74LS74?

74LS74 dual d flip-flop contains two independent positive-edge-triggered D flip-flops with complementary outputs. The information on the D input is accepted by the flip-flops on the positive-going edge of the clock pulse. The triggering occurs at a voltage level and is not directly related to the transition time of the rising edge of the clock. The data on the D input may be changed while the clock is LOW or HIGH without affecting the outputs as long as the data setup and hold times are not violated. A low logic level on the preset or clear inputs will set or reset the outputs regardless of the logic levels of the other inputs.


How to Use 74LS74

It is rather simple to use a Flip-Flop. Simply use the Vcc and GND pins to power the IC. As previously stated, each flip-flop works separately; simply connect the input signals 2 and 3 to use the first flip-flop, and the output will be at pins 5 and 6. A clock source should be given for pin 3, which is usually a PWM signal from an MCU or 555 timers. By making the pin high, you can clear the data and reset the flip flop. Taking a look at the function table below will help you understand how the Flip flop works. The symbol "X" stands for "don't care," while the up-arrow represents the signal's rising edge.

INPUTSOUTPUTS
PRE (bar)CLR  (bar)CLKDQQ  (bar)
LHXXHL
HLXXLH
LLXXHH
HH
HHL
HH
LLH
HHLXQ0Q(bar)

You can also run a simulation of the IC to see if it performs as expected. I've used logic state and logic bits to see if the IC works as it should, but you could use actual circuitry from your application to see if it meets your requirements. The gif file below can be compared to the truth table above to ensure that the IC is functioning properly.

How to use 74LS74.jpg

How to use 74LS74

74LS74 Connection Diagram

74LS74 Connection Diagram.jpg

74LS74 Connection Diagram


74LS74 Package

74LS74 Package.jpg

74LS74 Package

74LS74 Manufacturer

On Semiconductor (Nasdaq: ON) is a manufacturer engaging itself in reducing energy use. It features a comprehensive portfolio of power, signal management, and logic, custom solutions that are energy efficient. It acts as a world-class supply chain with high reliability and a network of manufacturing facilities, sales, offices, and design centres in key markets through North America, Europe, and the Asia Pacific regions.

Specifications

ON Semiconductor DM74LS74AN technical specifications, attributes, parameters and parts with similar specifications to ON Semiconductor DM74LS74AN.
  • Type
    Parameter
  • Mount

    In electronic components, the term "Mount" typically refers to the method or process of physically attaching or fixing a component onto a circuit board or other electronic device. This can involve soldering, adhesive bonding, or other techniques to secure the component in place. The mounting process is crucial for ensuring proper electrical connections and mechanical stability within the electronic system. Different components may have specific mounting requirements based on their size, shape, and function, and manufacturers provide guidelines for proper mounting procedures to ensure optimal performance and reliability of the electronic device.

    Through Hole
  • Mounting Type

    The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.

    Through Hole
  • Package / Case

    refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.

    14-DIP (0.300, 7.62mm)
  • Clock-Edge Trigger Type
    Positive Edge
  • Operating Temperature

    The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.

    0°C~70°C TA
  • Packaging

    Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.

    Tube
  • Series

    In electronic components, the "Series" refers to a group of products that share similar characteristics, designs, or functionalities, often produced by the same manufacturer. These components within a series typically have common specifications but may vary in terms of voltage, power, or packaging to meet different application needs. The series name helps identify and differentiate between various product lines within a manufacturer's catalog.

    74LS
  • Published
    2000
  • Part Status

    Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.

    Obsolete
  • Moisture Sensitivity Level (MSL)

    Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures

    1 (Unlimited)
  • Type
    D-Type
  • Voltage - Supply

    Voltage - Supply refers to the range of voltage levels that an electronic component or circuit is designed to operate with. It indicates the minimum and maximum supply voltage that can be applied for the device to function properly. Providing supply voltages outside this range can lead to malfunction, damage, or reduced performance. This parameter is critical for ensuring compatibility between different components in a circuit.

    4.75V~5.25V
  • Base Part Number

    The "Base Part Number" (BPN) in electronic components serves a similar purpose to the "Base Product Number." It refers to the primary identifier for a component that captures the essential characteristics shared by a group of similar components. The BPN provides a fundamental way to reference a family or series of components without specifying all the variations and specific details.

    74LS74
  • Function

    The parameter "Function" in electronic components refers to the specific role or purpose that the component serves within an electronic circuit. It defines how the component interacts with other elements, influences the flow of electrical signals, and contributes to the overall behavior of the system. Functions can include amplification, signal processing, switching, filtering, and energy storage, among others. Understanding the function of each component is essential for designing effective and efficient electronic systems.

    Set(Preset) and Reset
  • Output Type

    The "Output Type" parameter in electronic components refers to the type of signal or data that is produced by the component as an output. This parameter specifies the nature of the output signal, such as analog or digital, and can also include details about the voltage levels, current levels, frequency, and other characteristics of the output signal. Understanding the output type of a component is crucial for ensuring compatibility with other components in a circuit or system, as well as for determining how the output signal can be utilized or processed further. In summary, the output type parameter provides essential information about the nature of the signal that is generated by the electronic component as its output.

    Differential
  • Polarity

    In electronic components, polarity refers to the orientation or direction in which the component must be connected in a circuit to function properly. Components such as diodes, capacitors, and LEDs have polarity markings to indicate which terminal should be connected to the positive or negative side of the circuit. Connecting a component with incorrect polarity can lead to malfunction or damage. It is important to pay attention to polarity markings and follow the manufacturer's instructions to ensure proper operation of electronic components.

    Non-Inverting
  • Number of Circuits
    2
  • Clock Frequency

    Clock frequency, also known as clock speed, refers to the rate at which a processor or electronic component can execute instructions. It is measured in hertz (Hz) and represents the number of cycles per second that the component can perform. A higher clock frequency typically indicates a faster processing speed and better performance. However, it is important to note that other factors such as architecture, efficiency, and workload also play a significant role in determining the overall performance of a component. In summary, clock frequency is a crucial parameter that influences the speed and efficiency of electronic components in processing data and executing tasks.

    20MHz
  • Propagation Delay

    the flight time of packets over the transmission link and is limited by the speed of light.

    35 ns
  • Turn On Delay Time

    Turn-on delay, td(on), is the time taken to charge the input capacitance of the device before drain current conduction can start.

    35 ns
  • Logic Function

    In electronic components, the term "Logic Function" refers to the specific operation or behavior of a component based on its input signals. It describes how the component processes the input signals to produce the desired output. Logic functions are fundamental to digital circuits and are used to perform logical operations such as AND, OR, NOT, and XOR.Each electronic component, such as logic gates or flip-flops, is designed to perform a specific logic function based on its internal circuitry. By understanding the logic function of a component, engineers can design and analyze complex digital systems to ensure proper functionality and performance. Different logic functions can be combined to create more complex operations, allowing for the creation of sophisticated digital devices and systems.

    AND
  • Current - Quiescent (Iq)

    The parameter "Current - Quiescent (Iq)" in electronic components refers to the amount of current consumed by a device when it is in a quiescent or idle state, meaning when it is not actively performing any tasks or operations. This parameter is important because it represents the baseline power consumption of the device even when it is not actively being used. A lower quiescent current (Iq) value is desirable as it indicates that the device is more energy-efficient and will consume less power when not in use, which can help extend battery life in portable devices and reduce overall power consumption in electronic systems. Designers often pay close attention to the quiescent current specification when selecting components for low-power applications or battery-operated devices.

    8mA
  • Number of Bits per Element
    1
  • Max Propagation Delay @ V, Max CL

    The parameter "Max Propagation Delay @ V, Max CL" in electronic components refers to the maximum amount of time it takes for a signal to propagate through the component from input to output when operating at a specific voltage (V) and driving a maximum specified load capacitance (CL). This parameter is crucial in determining the speed and performance of the component in a circuit. A shorter propagation delay indicates faster signal processing and better overall performance. Designers use this parameter to ensure that signals can be transmitted and received within the required timing constraints in their electronic systems.

    35ns @ 5V, 50pF
  • Trigger Type

    Trigger Type in electronic components refers to the mechanism or method by which a device, such as a flip-flop or timer, responds to an input signal. It defines how the device transitions between states based on specific conditions, such as rising or falling edges of a signal, levels, or pulses. Different trigger types such as edge-triggered, level-triggered, or pulse-triggered influence the timing and behavior of the circuit, thereby determining how input signals affect the output in various applications.

    Positive Edge
  • Number of Output Lines
    1
  • RoHS Status

    RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.

    Non-RoHS Compliant
  • Lead Free

    Lead Free is a term used to describe electronic components that do not contain lead as part of their composition. Lead is a toxic material that can have harmful effects on human health and the environment, so the electronics industry has been moving towards lead-free components to reduce these risks. Lead-free components are typically made using alternative materials such as silver, copper, and tin. Manufacturers must comply with regulations such as the Restriction of Hazardous Substances (RoHS) directive to ensure that their products are lead-free and environmentally friendly.

    Contains Lead
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Datasheet PDF

Download datasheets and manufacturer documentation for ON Semiconductor DM74LS74AN.

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Frequently Asked Questions

What is the purpose of a 74LS74?

Introduction to 74LS74 Dual D Flip-Flop, the IC 74LS74 is the double D type edge-triggered category of flip flops comprised of clear preset and complementary output terminals. It has the ability to store data in the form of binary numbers and it also comes with features that stored data can be changed when required.

What is D flip flop truth table?

The D flip flop is the most important flip flop from other clocked types. It ensures that at the same time, both the inputs, i.e., S and R, are never equal to 1. The Delay flip-flop is designed using a gated SR flip-flop with an inverter connected between the inputs allowing for a single input D(Data).

What is the difference between latch and flip flop?

The major difference between flip-flop and latch is that the flip-flop is an edge-triggered type of memory circuit while the latch is a level-triggered type. It means that the output of a latch changes whenever the input changes.

What does the triangle on the 74ls74 mean?

The triangle indicates that the clock signal is an edge-triggered signal.
The circle indicates that the signal is low-active (ie., inverted).
The 74LS74 has a positive-edge trigger clock (low to high).
DM74LS74AN

ON Semiconductor

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