ON Semiconductor
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DM74ALS138SJX
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DM74ALS138SJX

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Decoder/Demultiplexer
  • Characteristics: High-speed, TTL compatible, 3-to-8 line decoder/demultiplexer
  • Package: 16-pin SOIC (Small Outline Integrated Circuit)
  • Essence: Converts a binary input into a corresponding output based on the selected line
  • Packaging/Quantity: Available in reels of 2500 units

Specifications

  • Supply Voltage: 4.5V to 5.5V
  • Input Voltage: 0V to VCC
  • Output Voltage: 0V to VCC
  • Operating Temperature: -40°C to +85°C
  • Propagation Delay: 15ns (typical)
  • Output Current: ±24mA
  • Input Capacitance: 3pF
  • Output Capacitance: 15pF

Detailed Pin Configuration

  1. GND (Ground)
  2. A0 (Address Input 0)
  3. A1 (Address Input 1)
  4. A2 (Address Input 2)
  5. E1 (Enable Input 1)
  6. E2 (Enable Input 2)
  7. Y0 (Output 0)
  8. Y1 (Output 1)
  9. Y2 (Output 2)
  10. Y3 (Output 3)
  11. Y4 (Output 4)
  12. Y5 (Output 5)
  13. Y6 (Output 6)
  14. Y7 (Output 7)
  15. VCC (Positive Power Supply)

Functional Features

  • Decodes a 3-bit binary input into one of eight outputs
  • Enables cascading multiple devices for larger decoding applications
  • TTL compatible inputs and outputs for easy integration with other ICs
  • High-speed operation allows for rapid data processing

Advantages and Disadvantages

Advantages

  • Compact size and low power consumption
  • Wide operating temperature range
  • High-speed performance
  • Easy integration with other TTL compatible devices

Disadvantages

  • Limited to 3-bit decoding, not suitable for larger applications
  • Requires additional components for more complex decoding tasks

Working Principles

The DM74ALS138SJX is a decoder/demultiplexer IC that converts a 3-bit binary input into one of eight corresponding outputs. The inputs A0, A1, and A2 determine the selected line, while the enable inputs E1 and E2 control the output state. When the enable inputs are active, the selected output line becomes active, while all other outputs remain inactive.

Detailed Application Field Plans

The DM74ALS138SJX finds applications in various fields where binary decoding is required. Some common application areas include:

  1. Address decoding in microprocessors and memory systems
  2. Data routing and selection in digital communication systems
  3. Control signal generation in industrial automation
  4. Display multiplexing in LED or LCD panels
  5. Input decoding in remote control systems

Detailed and Complete Alternative Models

  1. SN74LS138: Similar 3-to-8 line decoder/demultiplexer from Texas Instruments
  2. CD74HC138: High-speed CMOS version from Texas Instruments
  3. 74HCT138: CMOS version with Schmitt-trigger inputs from NXP Semiconductors
  4. MC14538B: Dual 1-of-4 decoder/demultiplexer from ON Semiconductor

These alternative models offer similar functionality and can be used as substitutes for the DM74ALS138SJX depending on specific requirements.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací DM74ALS138SJX v technických řešeních

Sure! Here are 10 common questions and answers related to the application of DM74ALS138SJX in technical solutions:

  1. Q: What is DM74ALS138SJX? A: DM74ALS138SJX is a specific type of decoder/demultiplexer integrated circuit (IC) manufactured by a company called Texas Instruments.

  2. Q: What is the purpose of DM74ALS138SJX? A: The purpose of DM74ALS138SJX is to decode binary information and select one of multiple output lines based on the input code.

  3. Q: What is the voltage supply range for DM74ALS138SJX? A: The voltage supply range for DM74ALS138SJX is typically between 4.75V and 5.25V.

  4. Q: How many input lines does DM74ALS138SJX have? A: DM74ALS138SJX has three enable inputs (E1, E2, and E3) and three binary-coded input lines (A0, A1, and A2), making a total of six input lines.

  5. Q: How many output lines does DM74ALS138SJX have? A: DM74ALS138SJX has eight output lines (Y0-Y7) that can be selected based on the input code.

  6. Q: What is the maximum operating frequency of DM74ALS138SJX? A: The maximum operating frequency of DM74ALS138SJX is typically around 33 MHz.

  7. Q: Can DM74ALS138SJX be used in both active-high and active-low applications? A: Yes, DM74ALS138SJX can be used in both active-high and active-low applications, depending on the logic levels applied to the enable inputs.

  8. Q: What is the output current capability of DM74ALS138SJX? A: The output current capability of DM74ALS138SJX is typically around 24 mA.

  9. Q: Can DM74ALS138SJX be cascaded to increase the number of input lines? A: Yes, multiple DM74ALS138SJX ICs can be cascaded together to increase the number of input lines and output lines.

  10. Q: What are some common applications of DM74ALS138SJX? A: DM74ALS138SJX is commonly used in various digital systems, such as address decoding, memory selection, data routing, and multiplexing/demultiplexing tasks.

Please note that the answers provided here are general and may vary depending on specific datasheet specifications or application requirements.