ON Semiconductor
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DM74ALS138N
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DM74ALS138N

Product Overview

Category

DM74ALS138N belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronics for decoding applications.

Characteristics

  • High-speed operation
  • Low power consumption
  • Wide operating voltage range
  • TTL compatible inputs
  • Three enable inputs for easy cascading

Package

DM74ALS138N is available in a 16-pin DIP (Dual In-line Package) format.

Essence

The essence of DM74ALS138N lies in its ability to decode binary information and select one of eight outputs based on the input signals.

Packaging/Quantity

DM74ALS138N is typically packaged in tubes or reels, with quantities varying depending on the supplier.

Specifications

  • Supply Voltage: 4.5V to 5.5V
  • Input Voltage: 0V to VCC
  • Output Voltage: 0V to VCC
  • Operating Temperature Range: -40°C to +85°C
  • Propagation Delay Time: 10ns (max)
  • Output Current: ±24mA

Detailed Pin Configuration

  1. GND (Ground)
  2. A0 (Input A0)
  3. A1 (Input A1)
  4. A2 (Input A2)
  5. E1 (Enable Input 1)
  6. E2 (Enable Input 2)
  7. E3 (Enable Input 3)
  8. Y0 (Output Y0)
  9. Y1 (Output Y1)
  10. Y2 (Output Y2)
  11. Y3 (Output Y3)
  12. Y4 (Output Y4)
  13. Y5 (Output Y5)
  14. Y6 (Output Y6)
  15. Y7 (Output Y7)
  16. VCC (Supply Voltage)

Functional Features

  • Decodes 3-bit binary information into 8 output lines
  • Three enable inputs allow cascading multiple ICs for larger decoding applications
  • High-speed operation enables real-time decoding in digital systems
  • Low power consumption makes it suitable for battery-powered devices
  • TTL compatible inputs ensure compatibility with a wide range of digital circuits

Advantages and Disadvantages

Advantages

  • Fast and efficient decoding of binary information
  • Low power consumption extends battery life in portable devices
  • Wide operating voltage range allows flexibility in different applications
  • Easy cascading with three enable inputs simplifies complex decoding tasks

Disadvantages

  • Limited to 3-bit decoding, may not be suitable for applications requiring higher bit decoding
  • Propagation delay time may introduce timing issues in certain high-speed applications

Working Principles

DM74ALS138N works based on the principle of combinational logic. It takes three input bits (A0, A1, A2) and decodes them into eight output lines (Y0-Y7). The enable inputs (E1, E2, E3) control the activation of the outputs. By manipulating the input signals and enable inputs, specific output lines can be selected.

Detailed Application Field Plans

DM74ALS138N finds applications in various fields, including: 1. Address decoding in microprocessors and microcontrollers 2. Memory selection in digital storage systems 3. Data routing in communication networks 4. Control signal generation in industrial automation 5. Display multiplexing in LED or LCD panels

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to DM74ALS138N are: 1. SN74LS138 2. CD74HC138 3. MC74ACT138 4. 74F138

These alternatives provide comparable decoding capabilities and can be used as substitutes depending on specific requirements.

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10 domande e risposte comuni relative all'applicazione di DM74ALS138N nelle soluzioni tecniche

Sure! Here are 10 common questions and answers related to the application of DM74ALS138N in technical solutions:

  1. Q: What is DM74ALS138N? A: DM74ALS138N is a decoder/demultiplexer integrated circuit (IC) that can be used to decode binary information and select one of multiple output lines based on the input.

  2. Q: What is the maximum operating voltage for DM74ALS138N? A: The maximum operating voltage for DM74ALS138N is typically 5.25V.

  3. Q: How many input lines does DM74ALS138N have? A: DM74ALS138N has three enable inputs (E1, E2, and E3) and three binary-coded input lines (A0, A1, and A2), allowing for up to 8 possible combinations.

  4. Q: What is the output configuration of DM74ALS138N? A: DM74ALS138N has eight active-low outputs (Y0-Y7) that can drive high current loads.

  5. Q: Can DM74ALS138N be cascaded to increase the number of output lines? A: Yes, DM74ALS138N can be cascaded by connecting the outputs of one decoder to the enable inputs of another decoder, allowing for expansion of the number of output lines.

  6. Q: What is the typical propagation delay of DM74ALS138N? A: The typical propagation delay of DM74ALS138N is around 15-20 nanoseconds.

  7. Q: Can DM74ALS138N be used in both TTL and CMOS logic systems? A: Yes, DM74ALS138N is compatible with both TTL and CMOS logic systems.

  8. Q: What is the power supply voltage range for DM74ALS138N? A: The power supply voltage range for DM74ALS138N is typically between 4.75V and 5.25V.

  9. Q: Can DM74ALS138N be used in multiplexing applications? A: Yes, DM74ALS138N can be used in multiplexing applications where multiple input signals need to be selectively routed to different output lines.

  10. Q: Are there any special considerations for using DM74ALS138N in high-frequency applications? A: Yes, in high-frequency applications, it is important to consider the propagation delay and setup/hold times of DM74ALS138N to ensure proper timing and avoid signal integrity issues.

Please note that these answers are general and may vary depending on the specific datasheet and application requirements of DM74ALS138N.