Texas Instruments
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SN74LS251NG4
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SN74LS251NG4

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Data Selector/Multiplexer
  • Characteristics:
    • Low-power Schottky TTL technology
    • 8-input multiplexer with three-state outputs
    • Wide operating voltage range: 4.75V to 5.25V
    • High-speed operation: 15ns typical propagation delay
  • Package: DIP-16 (Dual In-line Package)
  • Essence: The SN74LS251NG4 is a versatile data selector/multiplexer IC that allows the selection of one out of eight input lines based on the control inputs.
  • Packaging/Quantity: Available in tubes or reels, with 25 pieces per tube/reel.

Specifications

  • Supply Voltage Range: 4.75V to 5.25V
  • Input Voltage Range: 0V to VCC
  • Operating Temperature Range: -40°C to +85°C
  • Propagation Delay: 15ns (typical)
  • Output Current: ±8mA
  • Power Dissipation: 500mW (max)

Detailed Pin Configuration

The SN74LS251NG4 has a total of 16 pins arranged as follows:

__ __ A1 |1 \__/ 16| VCC A2 |2 15| B A3 |3 14| C A4 |4 SN 13| D A5 |5 74 12| E A6 |6 LS 11| F A7 |7 251 10| G GND |8________9| H

Functional Features

  • 8-input multiplexer: Allows selection of one out of eight input lines.
  • Three-state outputs: The selected input is routed to the output, while all other inputs are in a high-impedance state.
  • Enable input (G): When low, enables the multiplexer; when high, forces all outputs into a high-impedance state.

Advantages and Disadvantages

Advantages: - Low-power consumption due to Schottky TTL technology. - Fast operation with a typical propagation delay of 15ns. - Versatile data selection capabilities.

Disadvantages: - Limited to 8-input selection. - Requires external control signals for proper operation.

Working Principles

The SN74LS251NG4 operates based on the principle of data selection using multiplexing. It selects one out of eight input lines based on the control inputs A1-A7. The selected input is then routed to the output pin B. The enable input G controls the overall operation of the multiplexer, enabling or disabling the output.

Detailed Application Field Plans

The SN74LS251NG4 finds applications in various fields where data selection and multiplexing are required. Some common application areas include:

  1. Digital Communication Systems: Used for signal routing and data selection in communication systems such as routers and switches.
  2. Industrial Automation: Enables efficient selection of sensor inputs in automated systems, improving overall system performance.
  3. Test and Measurement Equipment: Facilitates the selection of different test signals for analysis and measurement purposes.
  4. Data Acquisition Systems: Allows the selection of specific data sources for processing and recording in data acquisition systems.

Detailed and Complete Alternative Models

  1. CD4051B: 8-channel analog multiplexer/demultiplexer IC.
  2. MC14051B: 8-channel analog multiplexer/demultiplexer IC.
  3. 74HC151: 8-input multiplexer IC with three-state outputs.

These alternative models provide similar functionality to the SN74LS251NG4 and can be used as replacements in various applications.

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Énumérez 10 questions et réponses courantes liées à l'application de SN74LS251NG4 dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of SN74LS251NG4:

  1. Q: What is SN74LS251NG4? A: SN74LS251NG4 is a multiplexer/demultiplexer IC (integrated circuit) that can be used in various technical solutions.

  2. Q: What is the purpose of SN74LS251NG4? A: SN74LS251NG4 is designed to select one of multiple input signals and route it to a single output, or vice versa.

  3. Q: How many inputs does SN74LS251NG4 have? A: SN74LS251NG4 has 8 input pins, allowing you to choose from up to 8 different input signals.

  4. Q: Can SN74LS251NG4 be used as a demultiplexer? A: Yes, SN74LS251NG4 can function as both a multiplexer and a demultiplexer, depending on how it is configured.

  5. Q: What is the voltage range supported by SN74LS251NG4? A: SN74LS251NG4 operates with a voltage range of 4.75V to 5.25V.

  6. Q: What is the maximum frequency at which SN74LS251NG4 can operate? A: SN74LS251NG4 can handle frequencies up to 33 MHz.

  7. Q: Can SN74LS251NG4 be cascaded to increase the number of inputs/outputs? A: Yes, multiple SN74LS251NG4 ICs can be cascaded together to expand the number of inputs or outputs.

  8. Q: What is the power consumption of SN74LS251NG4? A: The power consumption of SN74LS251NG4 is typically around 10mW.

  9. Q: Can SN74LS251NG4 be used in both digital and analog applications? A: SN74LS251NG4 is primarily designed for digital applications, but it can also be used in some analog scenarios.

  10. Q: Are there any specific precautions to consider when using SN74LS251NG4? A: It is important to ensure that the voltage supply and signal levels are within the specified range to avoid damaging the IC. Additionally, proper grounding and decoupling techniques should be employed for optimal performance.

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