Texas Instruments
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SN74123N
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SN74123N

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Multivibrator
  • Characteristics: Dual retriggerable monostable multivibrator
  • Package: DIP (Dual In-line Package)
  • Essence: Timing control device
  • Packaging/Quantity: 25 pieces per tube

Specifications

  • Supply Voltage Range: 4.75V to 5.25V
  • Operating Temperature Range: -55°C to 125°C
  • Trigger Pulse Width: 35ns (minimum)
  • Propagation Delay Time: 45ns (maximum)
  • Output Current: ±8mA
  • Power Dissipation: 500mW

Detailed Pin Configuration

The SN74123N IC has a total of 16 pins, which are labeled as follows:

  1. CLR (Clear)
  2. A (Trigger A)
  3. B (Trigger B)
  4. REXT (External Resistor)
  5. CEXT (External Capacitor)
  6. VCC (Positive Supply Voltage)
  7. Q (Output)
  8. GND (Ground)
  9. Q̅ (Complementary Output)
  10. RC (Reset Control)
  11. RB (Retrigger Control B)
  12. RA (Retrigger Control A)
  13. CT (Control Voltage)
  14. DIS (Disable)
  15. NC (No Connection)
  16. VCC (Positive Supply Voltage)

Functional Features

  • Retriggerable operation allows for extending the output pulse width.
  • Monostable multivibrator with two independent trigger inputs.
  • Clear input resets the output and internal flip-flop.
  • Control voltage input adjusts the timing characteristics.
  • Disable input stops the triggering capability.

Advantages and Disadvantages

Advantages: - Dual trigger inputs provide flexibility in controlling the output pulse. - Retriggerable feature allows for pulse width extension. - Control voltage input enables precise timing adjustments.

Disadvantages: - Limited output current capability. - Requires external resistors and capacitors for operation.

Working Principles

The SN74123N is a dual retriggerable monostable multivibrator. It generates a single output pulse of a fixed duration when triggered by an external signal. The output pulse width can be extended by applying additional trigger pulses before the completion of the previous pulse. The timing characteristics are controlled by external resistors and capacitors, as well as the control voltage input.

Detailed Application Field Plans

The SN74123N IC finds applications in various fields, including:

  1. Timing circuits: Used to generate precise time delays in electronic systems.
  2. Pulse shaping: Used to create well-defined output pulses for triggering other devices.
  3. Frequency division: Utilized in frequency divider circuits to divide the input frequency.
  4. Sequential logic: Employed in sequential circuits for controlling the timing of operations.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the SN74123N IC include:

  1. CD74HC123E
  2. MC74HC123AN
  3. HEF4528BP
  4. 74LS123N
  5. CD4047BE

These alternatives can be considered based on specific requirements and availability.

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Maglista ng 10 karaniwang tanong at sagot na nauugnay sa aplikasyon ng SN74123N sa mga teknikal na solusyon

Sure! Here are 10 common questions and answers related to the application of SN74123N in technical solutions:

  1. Q: What is SN74123N? A: SN74123N is a dual retriggerable monostable multivibrator IC, commonly used in timing applications.

  2. Q: What is the operating voltage range for SN74123N? A: The operating voltage range for SN74123N is typically between 4.75V and 5.25V.

  3. Q: How does SN74123N work? A: SN74123N works by triggering a pulse output of a fixed duration when an input signal meets certain conditions.

  4. Q: What is the maximum frequency at which SN74123N can operate? A: SN74123N can typically operate at frequencies up to 33 MHz.

  5. Q: Can SN74123N be used as a delay timer? A: Yes, SN74123N can be used as a delay timer by adjusting the values of external resistors and capacitors.

  6. Q: What is the typical output pulse width range of SN74123N? A: The typical output pulse width range of SN74123N is from 15 ns to 1000 ns.

  7. Q: Can SN74123N be used in both positive and negative edge-triggered applications? A: Yes, SN74123N can be used in both positive and negative edge-triggered applications.

  8. Q: What is the power supply current requirement for SN74123N? A: The power supply current requirement for SN74123N is typically around 10 mA.

  9. Q: Can SN74123N be cascaded to achieve longer delay times? A: Yes, SN74123N can be cascaded to achieve longer delay times by connecting the output of one IC to the input of another.

  10. Q: What are some common applications of SN74123N? A: Some common applications of SN74123N include pulse width modulation, frequency division, time delay generation, and precision timing circuits.

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