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DM74LS257BN
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DM74LS257BN

Product Overview

Category

DM74LS257BN belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used for data multiplexing applications.

Characteristics

  • Package: DIP (Dual In-line Package)
  • Essence: Quad 2-input multiplexer with tri-state outputs
  • Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier

Specifications

The DM74LS257BN has the following specifications:

  • Supply Voltage: 4.75V to 5.25V
  • Input Voltage: 0V to VCC
  • Output Voltage: 0V to VCC
  • Operating Temperature Range: 0°C to 70°C
  • Propagation Delay Time: 15ns (typical)
  • High-Level Output Current: -0.4mA (maximum)
  • Low-Level Output Current: 8mA (maximum)

Detailed Pin Configuration

The DM74LS257BN has a total of 16 pins. The pin configuration is as follows:

  1. A0 - Data Input A0
  2. B0 - Data Input B0
  3. A1 - Data Input A1
  4. B1 - Data Input B1
  5. G - Enable Input
  6. Y0 - Multiplexed Output Y0
  7. Y1 - Multiplexed Output Y1
  8. Y2 - Multiplexed Output Y2
  9. Y3 - Multiplexed Output Y3
  10. VCC - Positive Power Supply
  11. Y3 - Multiplexed Output Y3
  12. Y2 - Multiplexed Output Y2
  13. Y1 - Multiplexed Output Y1
  14. Y0 - Multiplexed Output Y0
  15. G - Enable Input
  16. GND - Ground

Functional Features

The DM74LS257BN offers the following functional features:

  • Quad 2-input multiplexer with tri-state outputs
  • Allows selection of one of four data inputs to be routed to the output
  • Tri-state outputs enable high impedance state when disabled

Advantages and Disadvantages

Advantages

  • Provides efficient data multiplexing functionality
  • Tri-state outputs allow for easy bus sharing
  • Compact DIP package for easy integration into circuits

Disadvantages

  • Limited to 4 data inputs, may not be suitable for applications requiring more inputs
  • Propagation delay time may affect real-time applications

Working Principles

The DM74LS257BN works by using the enable input (G) to control the selection of one of the four data inputs (A0, B0, A1, B1) to be routed to the outputs (Y0, Y1, Y2, Y3). When the enable input is low, the outputs are in a high impedance state. The selected data input is then passed through to the corresponding output.

Detailed Application Field Plans

The DM74LS257BN can be used in various applications, including but not limited to:

  1. Data multiplexing in digital communication systems
  2. Address decoding in memory systems
  3. Input/output expansion in microcontroller-based systems
  4. Bus sharing in multi-device communication networks

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the DM74LS257BN include:

  1. SN74LS257N
  2. CD74LS257E
  3. MC74LS257D
  4. 74HC257N

These alternative models can be considered based on specific requirements and availability.

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Énumérez 10 questions et réponses courantes liées à l'application de DM74LS257BN dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of DM74LS257BN:

  1. Q: What is DM74LS257BN? A: DM74LS257BN is a quad 2-input multiplexer with tri-state outputs, commonly used in digital logic circuits.

  2. Q: What is the purpose of DM74LS257BN? A: The purpose of DM74LS257BN is to select one of four data inputs and route it to a single output based on the control inputs.

  3. Q: How many data inputs does DM74LS257BN have? A: DM74LS257BN has four data inputs (D0, D1, D2, and D3).

  4. Q: How many control inputs does DM74LS257BN have? A: DM74LS257BN has two control inputs (G and G̅) which determine the selection of the data input.

  5. Q: What are the tri-state outputs in DM74LS257BN? A: The tri-state outputs (Y0, Y1, Y2, and Y3) allow the selected data input to be either driven onto the output or put into a high-impedance state.

  6. Q: What is the power supply voltage range for DM74LS257BN? A: The power supply voltage range for DM74LS257BN is typically between 4.75V and 5.25V.

  7. Q: What is the maximum operating frequency of DM74LS257BN? A: The maximum operating frequency of DM74LS257BN is typically around 33 MHz.

  8. Q: Can DM74LS257BN be cascaded to increase the number of inputs? A: Yes, multiple DM74LS257BN chips can be cascaded together to increase the number of inputs and outputs.

  9. Q: What is the recommended operating temperature range for DM74LS257BN? A: The recommended operating temperature range for DM74LS257BN is usually between 0°C and 70°C.

  10. Q: Are there any specific precautions to consider when using DM74LS257BN? A: Yes, 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.

Please note that these answers are general and may vary depending on the specific application and requirements. It is always recommended to refer to the datasheet and consult with a technical expert for accurate information.