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SN74LS74AD

SN74LS74AD

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Flip-Flop
  • Characteristics: Dual D-Type Positive-Edge-Triggered Flip-Flop
  • Package: 14-Pin Plastic Dual In-Line Package (PDIP)
  • Essence: Sequential Logic Device
  • Packaging/Quantity: Tape and Reel, 2000 units per reel

Specifications

  • Supply Voltage Range: 4.75V to 5.25V
  • High-Level Input Voltage: 2V (min), 7V (max)
  • Low-Level Input Voltage: 0.8V (min), 0.8V (max)
  • High-Level Output Voltage: 2.7V (min), VCC (max)
  • Low-Level Output Voltage: 0.5V (min), 0.35V (max)
  • Maximum Operating Frequency: 33 MHz

Detailed Pin Configuration

  1. CLR (Clear) - Active LOW input
  2. D (Data) - Data input
  3. CLK (Clock) - Clock input
  4. PR (Preset) - Active LOW input
  5. Q (Output) - Complementary output
  6. Q̅ (Output) - Complementary output
  7. GND (Ground) - Ground reference
  8. Q̅ (Output) - Complementary output
  9. Q (Output) - Complementary output
  10. VCC (Supply Voltage) - Positive power supply
  11. D (Data) - Data input
  12. CLK (Clock) - Clock input
  13. PR (Preset) - Active LOW input
  14. CLR (Clear) - Active LOW input

Functional Features

  • Dual D-type positive-edge-triggered flip-flop
  • Direct clear and preset inputs for each flip-flop
  • Outputs can drive up to 10 LS-TTL loads
  • High-speed operation with a maximum frequency of 33 MHz
  • Wide supply voltage range for compatibility with various systems

Advantages and Disadvantages

Advantages

  • Dual flip-flop in a single package saves board space
  • Direct clear and preset inputs provide flexibility in controlling the flip-flop state
  • High-speed operation allows for efficient data processing
  • Wide supply voltage range enhances compatibility with different power systems

Disadvantages

  • Limited output drive capability compared to some other ICs
  • Not suitable for applications requiring very high frequencies

Working Principles

The SN74LS74AD is a dual D-type positive-edge-triggered flip-flop. It stores one bit of data and transfers it to the output on the rising edge of the clock signal. The flip-flop can be cleared or preset using the CLR and PR inputs, respectively. The complementary outputs Q and Q̅ provide the inverted and non-inverted versions of the stored data.

Detailed Application Field Plans

The SN74LS74AD is commonly used in digital systems where sequential logic is required. Some application areas include:

  1. Counters and Registers: The flip-flop can be used as building blocks for counters and registers in microprocessors and digital signal processors.
  2. State Machines: Sequential circuits like finite state machines can be implemented using multiple flip-flops interconnected to represent different states and transitions.
  3. Data Storage: The flip-flop can store data temporarily in memory elements like shift registers and buffers.
  4. Clock Synchronization: The flip-flop can be used to synchronize signals with different clock domains in digital communication systems.

Detailed and Complete Alternative Models

Some alternative models to SN74LS74AD that serve similar functions are:

  1. CD4013BCN: CMOS Dual D-Type Flip-Flop
  2. MC74HC74AN: High-Speed CMOS Dual D-Type Flip-Flop
  3. 74F74PC: Dual D-Type Positive-Edge-Triggered Flip-Flop

These alternatives offer similar functionality but may have different specifications and pin configurations.

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Luettele 10 yleistä kysymystä ja vastausta, jotka liittyvät SN74LS74AD :n soveltamiseen teknisissä ratkaisuissa

Sure! Here are 10 common questions and answers related to the application of SN74LS74AD:

  1. Q: What is SN74LS74AD? A: SN74LS74AD is a dual D-type flip-flop integrated circuit (IC) that can store one bit of data in each flip-flop.

  2. Q: What is the purpose of using SN74LS74AD in technical solutions? A: SN74LS74AD is commonly used for various applications such as data storage, synchronization, frequency division, and sequential logic circuits.

  3. Q: How many flip-flops are there in SN74LS74AD? A: SN74LS74AD consists of two independent D-type flip-flops, which means it can store two bits of data.

  4. Q: What is the maximum clock frequency supported by SN74LS74AD? A: The maximum clock frequency supported by SN74LS74AD is typically around 25 MHz.

  5. Q: Can SN74LS74AD be used with both positive and negative edge-triggered clocks? A: No, SN74LS74AD is designed to work with positive-edge triggered clocks only.

  6. Q: What is the power supply voltage range for SN74LS74AD? A: The power supply voltage range for SN74LS74AD is typically between 4.75V and 5.25V.

  7. Q: Does SN74LS74AD have any built-in asynchronous inputs? A: Yes, SN74LS74AD has asynchronous preset (PRE) and clear (CLR) inputs to set or reset the flip-flop outputs independently of the clock.

  8. Q: What is the output drive capability of SN74LS74AD? A: SN74LS74AD has a standard output drive capability of 10 TTL loads.

  9. Q: Can SN74LS74AD be cascaded to create larger counters or shift registers? A: Yes, multiple SN74LS74AD ICs can be cascaded together to create larger counters or shift registers.

  10. Q: Are there any specific precautions to consider when using SN74LS74AD? A: It is important to ensure proper decoupling capacitors are used near the power supply pins and to avoid exceeding the maximum ratings specified in the datasheet, such as voltage and temperature limits.

Please note that these answers are general and may vary depending on the specific application and requirements. Always refer to the datasheet and consult with technical documentation for accurate information.