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SN74LS123DR
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SN74LS123DR

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Multivibrator and Monostable Multivibrator
  • Characteristics: TTL Logic, Dual Retriggerable Monostable Multivibrator
  • Package: SOIC-16
  • Essence: The SN74LS123DR is a dual retriggerable monostable multivibrator IC that operates on TTL logic. It is commonly used in electronic circuits where timing and pulse generation are required.
  • Packaging/Quantity: The SN74LS123DR is available in a standard SOIC-16 package and is typically sold in reels or tubes containing multiple units.

Specifications

  • Supply Voltage: 4.75V to 5.25V
  • Operating Temperature Range: -40°C to +85°C
  • Propagation Delay Time: 22ns
  • Trigger Pulse Width: 30ns to 1000ns
  • Output Current: ±8mA
  • Input Capacitance: 10pF
  • Output Capacitance: 15pF

Detailed Pin Configuration

The SN74LS123DR has a total of 16 pins arranged as follows:

__ __ A1 |1 \__/ 16| VCC B1 |2 15| CLR A2 |3 14| Q1 B2 |4 13| Q2 GND |5 12| Q3 R1 |6 11| Q4 C1 |7 10| TR R2 |8 9| C2 ‾‾ ‾‾

Functional Features

  • Dual retriggerable monostable multivibrator
  • TTL logic compatibility
  • Wide operating voltage range
  • Fast propagation delay time
  • Adjustable trigger pulse width
  • Output pulse duration controlled by external components

Advantages and Disadvantages

Advantages: - Dual monostable multivibrator in a single package saves board space - Retriggerable feature allows for extended output pulse duration - TTL logic compatibility ensures easy integration with other digital circuits - Wide operating voltage range provides flexibility in various applications

Disadvantages: - Limited output current may restrict use in certain high-power applications - Input and output capacitance can affect circuit performance in high-frequency applications

Working Principles

The SN74LS123DR operates as a dual retriggerable monostable multivibrator. It generates an output pulse of a fixed duration when triggered by an input signal. The pulse width can be adjusted using external resistors and capacitors connected to the TR (Trigger) and C1/C2 (Timing Capacitor) pins. The device can be retriggered during the output pulse, extending its duration.

Detailed Application Field Plans

The SN74LS123DR finds applications in various fields where precise timing and pulse generation are required. Some common application areas include:

  1. Timing circuits in digital systems
  2. Pulse-width modulation (PWM) control
  3. Frequency division and counting circuits
  4. Delay circuits for synchronization purposes
  5. Precision timing in communication systems
  6. Industrial automation and control systems

Detailed and Complete Alternative Models

  1. CD74HC123E: High-speed CMOS dual retriggerable monostable multivibrator
  2. MC14528B: Dual retriggerable precision monostable multivibrator
  3. 74HCT123D: Dual retriggerable monostable multivibrator with Schmitt-trigger inputs
  4. CD4047BE: Monostable/astable multivibrator IC with adjustable pulse width

These alternative models offer similar functionality and can be used as substitutes for the SN74LS123DR in various applications.

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Luettele 10 yleistä kysymystä ja vastausta, jotka liittyvät SN74LS123DR :n soveltamiseen teknisissä ratkaisuissa

Sure! Here are 10 common questions and answers related to the application of SN74LS123DR in technical solutions:

  1. Q: What is SN74LS123DR? A: SN74LS123DR is a dual retriggerable monostable multivibrator IC, commonly used in timing and control applications.

  2. Q: What is the operating voltage range for SN74LS123DR? A: The operating voltage range for SN74LS123DR is typically between 4.75V and 5.25V.

  3. Q: What is the maximum frequency at which SN74LS123DR can operate? A: SN74LS123DR can operate at a maximum frequency of around 33 MHz.

  4. Q: How many inputs and outputs does SN74LS123DR have? A: SN74LS123DR has two inputs (A and B) and two outputs (Q and Q̅).

  5. Q: What is the purpose of the CLR (clear) input in SN74LS123DR? A: The CLR input is used to reset the internal state of the IC and force the output to a low state.

  6. Q: Can SN74LS123DR be used as a pulse stretcher? A: Yes, SN74LS123DR can be used as a pulse stretcher by connecting the appropriate external components.

  7. Q: What is the typical propagation delay of SN74LS123DR? A: The typical propagation delay of SN74LS123DR is around 22 ns.

  8. Q: Can SN74LS123DR be cascaded to achieve longer time delays? A: Yes, multiple SN74LS123DR ICs can be cascaded together to achieve longer time delays.

  9. Q: What is the maximum power dissipation of SN74LS123DR? A: The maximum power dissipation of SN74LS123DR is typically around 500 mW.

  10. Q: What are some common applications of SN74LS123DR? A: SN74LS123DR is commonly used in applications such as pulse generation, time delay circuits, frequency division, and precision timing control.

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