ON Semiconductor
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DM74LS155N
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DM74LS155N

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Decoder/Demultiplexer
  • Characteristics: TTL Logic, Dual 2-Line to 4-Line Decoder/Demultiplexer
  • Package: DIP (Dual In-line Package)
  • Essence: The DM74LS155N is a TTL logic decoder/demultiplexer IC that can decode two binary inputs into four separate outputs.
  • Packaging/Quantity: Available in tubes or reels, with varying quantities depending on the supplier.

Specifications

  • Logic Family: TTL (Transistor-Transistor Logic)
  • Number of Inputs: 2
  • Number of Outputs: 4
  • Supply Voltage: 5V
  • Operating Temperature Range: -55°C to +125°C
  • Propagation Delay: 15ns (typical)

Detailed Pin Configuration

The DM74LS155N has a total of 16 pins. Here is the detailed pin configuration:

  1. GND (Ground)
  2. A0 (Input A0)
  3. A1 (Input A1)
  4. E1 (Enable Input 1)
  5. Y0 (Output Y0)
  6. Y1 (Output Y1)
  7. Y2 (Output Y2)
  8. Y3 (Output Y3)
  9. VCC (Positive Power Supply)
  10. E2 (Enable Input 2)
  11. B0 (Input B0)
  12. B1 (Input B1)
  13. Y4 (Output Y4)
  14. Y5 (Output Y5)
  15. Y6 (Output Y6)
  16. Y7 (Output Y7)

Functional Features

  • Decodes two binary inputs (A and B) into four separate outputs (Y0-Y3).
  • Enables input pins (E1 and E2) control the operation of the decoder/demultiplexer.
  • TTL logic ensures compatibility with other TTL devices.
  • Low propagation delay allows for fast data processing.

Advantages and Disadvantages

Advantages: - Compact and integrated design saves space on circuit boards. - Easy to use and implement in digital circuits. - Provides efficient decoding and demultiplexing functionality.

Disadvantages: - Limited number of inputs and outputs compared to more advanced ICs. - Requires external components for proper voltage regulation and protection.

Working Principles

The DM74LS155N operates based on the principles of binary decoding and demultiplexing. It takes two binary inputs (A and B) and decodes them into four separate outputs (Y0-Y3). The enable inputs (E1 and E2) control the operation of the decoder/demultiplexer, allowing for selective output activation.

Detailed Application Field Plans

The DM74LS155N can be used in various applications, including:

  1. Address decoding in microprocessors and memory systems.
  2. Data routing and selection in digital multiplexing systems.
  3. Control signal generation in digital communication systems.
  4. Input/output expansion in embedded systems.
  5. Circuitry for arithmetic and logic operations in digital calculators.

Detailed and Complete Alternative Models

Here are some alternative models that offer similar functionality to the DM74LS155N:

  1. SN74LS155N
  2. CD74HC155E
  3. MC74HC155N
  4. 74HCT155N
  5. 74F155PC

These alternative models may have slight differences in specifications and pin configurations but serve the same purpose as the DM74LS155N.

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Énumérez 10 questions et réponses courantes liées à l'application de DM74LS155N dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of DM74LS155N in technical solutions:

  1. Q: What is DM74LS155N? A: DM74LS155N is a dual 2-line to 4-line decoder/demultiplexer integrated circuit (IC) commonly used in digital electronics.

  2. Q: What is the purpose of DM74LS155N? A: The purpose of DM74LS155N is to decode binary information from two input lines into four output lines, allowing for various demultiplexing applications.

  3. Q: How does DM74LS155N work? A: DM74LS155N uses logic gates internally to decode the binary inputs and activate the corresponding output lines based on the input combination.

  4. Q: What voltage levels does DM74LS155N support? A: DM74LS155N typically supports a voltage range of 4.75V to 5.25V, making it compatible with standard TTL (Transistor-Transistor Logic) levels.

  5. Q: Can DM74LS155N be used in both active-high and active-low configurations? A: Yes, DM74LS155N can be used in both active-high and active-low configurations, depending on the specific application requirements.

  6. Q: What are some common applications of DM74LS155N? A: DM74LS155N is commonly used in address decoding, memory selection, data routing, and general-purpose demultiplexing applications.

  7. Q: How many select inputs does DM74LS155N have? A: DM74LS155N has two select inputs, which determine the output line(s) to be activated based on the binary input combination.

  8. Q: What is the maximum output current of DM74LS155N? A: The maximum output current of DM74LS155N is typically around 8mA, which should be considered when connecting external devices.

  9. Q: Can DM74LS155N be cascaded to increase the number of output lines? A: Yes, DM74LS155N can be cascaded with other decoder/demultiplexer ICs to increase the number of output lines and expand its functionality.

  10. Q: Are there any specific precautions to consider when using DM74LS155N? A: It is important to ensure proper power supply decoupling, avoid exceeding the maximum voltage levels, and follow the recommended operating conditions mentioned in the datasheet for reliable operation.

Please note that these answers are general and may vary depending on the specific datasheet and manufacturer's guidelines for DM74LS155N.