Texas Instruments
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SN74LS123DE4
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SN74LS123DE4

Product Overview

Category

SN74LS123DE4 belongs to the category of integrated circuits (ICs).

Use

This product is commonly used in digital electronics and microprocessor-based systems.

Characteristics

  • Low-power Schottky TTL technology
  • Dual retriggerable monostable multivibrator
  • Wide operating voltage range: 4.75V to 5.25V
  • High noise immunity: 0.45 VCC (typical)
  • Output drive capability: 10 LSTTL loads
  • Monostable operation with a single external resistor and capacitor
  • Trigger and reset inputs are TTL compatible

Package

SN74LS123DE4 is available in a small-outline integrated circuit (SOIC) package.

Essence

The essence of SN74LS123DE4 lies in its ability to generate precise time delays or pulses in digital circuits.

Packaging/Quantity

This product is typically packaged in reels, with each reel containing a specific quantity of ICs. The exact quantity may vary depending on the manufacturer's specifications.

Specifications

  • Supply Voltage Range: 4.75V to 5.25V
  • Operating Temperature Range: -40°C to +85°C
  • Input Voltage Range: 0V to 5.25V
  • Output Voltage Range: 0V to 5.25V
  • Maximum Propagation Delay Time: 35 ns
  • Maximum Power Dissipation: 500 mW

Detailed Pin Configuration

  1. VCC: Positive power supply input
  2. GND: Ground reference
  3. A: Trigger input
  4. B: Reset input
  5. Rext: External resistor for timing control
  6. Cext: External capacitor for timing control
  7. Q: Output
  8. Q̅: Complementary output

Functional Features

SN74LS123DE4 is a dual retriggerable monostable multivibrator. It can be triggered by a positive or negative edge on the trigger input (A) and reset by a positive edge on the reset input (B). The timing of the output pulse is determined by an external resistor (Rext) and capacitor (Cext).

Advantages and Disadvantages

Advantages

  • Low-power consumption
  • Wide operating voltage range
  • High noise immunity
  • Compact SOIC package
  • Easy integration into digital circuits

Disadvantages

  • Limited maximum power dissipation
  • Requires external components for timing control

Working Principles

When triggered, SN74LS123DE4 generates a pulse whose duration is determined by the values of the external resistor and capacitor connected to the Rext and Cext pins. The output pulse width can be adjusted by varying these external components.

Detailed Application Field Plans

SN74LS123DE4 finds applications in various fields, including: 1. Timing circuits in microprocessor-based systems 2. Pulse generation in digital communication systems 3. Control signal generation in industrial automation 4. Delay circuits in robotics and embedded systems 5. Precision timing in scientific instruments

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to SN74LS123DE4 include: 1. CD74HC123E: Dual retriggerable monostable multivibrator with CMOS technology 2. MC14538B: Dual precision monostable multivibrator with TTL technology 3. 74HCT123D: Dual retriggerable monostable multivibrator with high-speed CMOS technology

These alternative models can be considered based on specific requirements and compatibility with existing circuit designs.

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Énumérez 10 questions et réponses courantes liées à l'application de SN74LS123DE4 dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of SN74LS123DE4 in technical solutions:

  1. Q: What is SN74LS123DE4? A: SN74LS123DE4 is a dual retriggerable monostable multivibrator IC, commonly used in timing and control applications.

  2. Q: What is the operating voltage range for SN74LS123DE4? A: The operating voltage range for SN74LS123DE4 is typically between 4.75V and 5.25V.

  3. Q: What is the maximum frequency at which SN74LS123DE4 can operate? A: SN74LS123DE4 can operate at a maximum frequency of around 33 MHz.

  4. Q: How many inputs does SN74LS123DE4 have? A: SN74LS123DE4 has two inputs, labeled A and B.

  5. Q: What is the purpose of the CLR (clear) input in SN74LS123DE4? A: The CLR input is used to reset the internal state of the IC and bring it back to its initial condition.

  6. Q: Can SN74LS123DE4 be used as a pulse stretcher? A: Yes, SN74LS123DE4 can be used as a pulse stretcher by utilizing its retriggerable feature.

  7. Q: What is the typical output pulse width range of SN74LS123DE4? A: The typical output pulse width range of SN74LS123DE4 is from 30 ns to 200 ns.

  8. Q: Can SN74LS123DE4 be cascaded to achieve longer delay periods? A: Yes, multiple SN74LS123DE4 ICs can be cascaded to achieve longer delay periods by connecting the output of one IC to the input of another.

  9. Q: What is the maximum supply current required by SN74LS123DE4? A: The maximum supply current required by SN74LS123DE4 is typically around 16 mA.

  10. Q: Can SN74LS123DE4 be used in both digital and analog applications? A: No, SN74LS123DE4 is primarily designed for digital applications and may not be suitable for analog applications.

Please note that these answers are general and may vary depending on specific datasheet specifications and application requirements.