ON Semiconductor
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MC74LVX138M
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MC74LVX138M

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Decoder/Demultiplexer
  • Characteristics: Low-voltage, high-speed, 3-to-8 line decoder/demultiplexer
  • Package: SOIC-16 (Small Outline Integrated Circuit), TSSOP-16 (Thin Shrink Small Outline Package)
  • Essence: MC74LVX138M is a decoder/demultiplexer IC that converts a binary input into a specific output line.
  • Packaging/Quantity: Available in reels or tubes, with varying quantities depending on the supplier.

Specifications

  • Supply Voltage: 2.0V to 5.5V
  • Input Voltage: -0.5V to VCC + 0.5V
  • Output Voltage: -0.5V to VCC + 0.5V
  • Operating Temperature Range: -40°C to +85°C
  • Propagation Delay: 6 ns (typical)
  • Output Current: ±24 mA
  • Number of Inputs: 3
  • Number of Outputs: 8

Detailed Pin Configuration

The MC74LVX138M has a total of 16 pins, which are assigned as follows:

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

Functional Features

  • Converts a 3-bit binary input into one of the eight output lines.
  • Enables cascading multiple MC74LVX138M ICs for larger decoding applications.
  • Low-voltage operation allows compatibility with various digital systems.
  • High-speed operation ensures quick response times.

Advantages and Disadvantages

Advantages

  • Compact package size enables space-saving designs.
  • Wide operating voltage range provides flexibility in different applications.
  • Fast propagation delay allows for efficient data processing.
  • Multiple outputs allow for versatile use in various circuits.

Disadvantages

  • Limited number of inputs may restrict certain complex decoding applications.
  • Lack of built-in protection features may require additional circuitry for robustness.

Working Principles

The MC74LVX138M operates based on the principle of binary decoding. The three input pins (A0, A1, A2) accept a 3-bit binary code, which is then decoded to activate one of the eight output lines (Y0-Y7). The enable inputs (E1, E2) control the activation of the decoder/demultiplexer. When enabled, the selected output line becomes active, while the remaining lines remain inactive.

Detailed Application Field Plans

The MC74LVX138M finds applications in various fields, including:

  1. Address decoding in microcontrollers and microprocessors.
  2. Memory selection in digital systems.
  3. Data routing in communication systems.
  4. Signal demultiplexing in multimedia devices.
  5. Control logic implementation in industrial automation.

Detailed and Complete Alternative Models

  1. SN74LS138: Similar 3-to-8 line decoder/demultiplexer IC from Texas Instruments.
  2. CD74HC238: High-speed CMOS 3-to-8 line decoder/demultiplexer IC from Texas Instruments.
  3. 74HC138: 3-to-8 line decoder/demultiplexer IC from various manufacturers.

These alternative models offer similar functionality and can be used as substitutes for the MC74LVX138M in different applications.

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Senaraikan 10 soalan dan jawapan biasa yang berkaitan dengan aplikasi MC74LVX138M dalam penyelesaian teknikal

Sure! Here are 10 common questions and answers related to the application of MC74LVX138M in technical solutions:

  1. Q: What is MC74LVX138M? A: MC74LVX138M is a 3-to-8 line decoder/demultiplexer integrated circuit (IC) that can be used in various digital logic applications.

  2. Q: What is the operating voltage range of MC74LVX138M? A: The operating voltage range of MC74LVX138M is typically between 2.0V and 5.5V.

  3. Q: How many input lines does MC74LVX138M have? A: MC74LVX138M has three input lines, A0, A1, and A2, which are used to select one of the eight outputs.

  4. Q: What are the output options of MC74LVX138M? A: MC74LVX138M provides eight active-low outputs (Y0-Y7) that correspond to the selected input combination.

  5. Q: Can MC74LVX138M be used as a demultiplexer? A: Yes, MC74LVX138M can be used as a demultiplexer by connecting the input lines to the data inputs and using the outputs to select different destinations for the data.

  6. Q: What is the maximum output current of MC74LVX138M? A: The maximum output current of MC74LVX138M is typically 24mA.

  7. Q: Is MC74LVX138M compatible with TTL logic levels? A: Yes, MC74LVX138M is compatible with both TTL and CMOS logic levels, making it versatile for interfacing with different types of devices.

  8. Q: Can MC74LVX138M be cascaded to increase the number of outputs? A: Yes, multiple MC74LVX138M ICs can be cascaded together to increase the number of outputs and create larger decoder/demultiplexer configurations.

  9. Q: What is the propagation delay of MC74LVX138M? A: The propagation delay of MC74LVX138M is typically around 5ns, making it suitable for high-speed applications.

  10. Q: Are there any specific application notes or reference designs available for MC74LVX138M? A: Yes, the manufacturer provides application notes and reference designs that showcase different ways to use MC74LVX138M in various technical solutions. These resources can be found on the manufacturer's website or datasheet.