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MC74LCX138DTR2
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MC74LCX138DTR2

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Decoding and demultiplexing
  • Characteristics: Low-voltage, high-speed, 3-to-8 line decoder/demultiplexer
  • Package: TSSOP-16
  • Essence: Logic gate implementation for decoding and demultiplexing signals
  • Packaging/Quantity: Tape and reel packaging, 2500 units per reel

Specifications

  • Supply Voltage: 1.65V 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: 4.5ns (typical)
  • Output Current: ±24mA
  • Input Capacitance: 3pF (typical)

Detailed Pin Configuration

The MC74LCX138DTR2 has a total of 16 pins, which are assigned specific functions as follows:

  1. GND: Ground reference
  2. A0: Address input bit 0
  3. A1: Address input bit 1
  4. A2: Address input bit 2
  5. E1: Enable input 1
  6. Y0: Output 0
  7. Y1: Output 1
  8. Y2: Output 2
  9. Y3: Output 3
  10. Y4: Output 4
  11. Y5: Output 5
  12. Y6: Output 6
  13. Y7: Output 7
  14. E2: Enable input 2
  15. VCC: Positive supply voltage
  16. GND: Ground reference

Functional Features

  • Decodes three binary address inputs into eight mutually exclusive outputs
  • Demultiplexes one of eight input lines to a single output line based on the address inputs
  • Low-voltage operation allows compatibility with various logic families
  • High-speed operation enables efficient signal processing
  • Output enable inputs for easy control of output states

Advantages and Disadvantages

Advantages: - Low-voltage operation makes it suitable for modern electronic systems - High-speed performance ensures quick signal processing - Compact TSSOP-16 package saves board space - Versatile functionality for decoding and demultiplexing applications

Disadvantages: - Limited number of input and output lines (3-to-8 decoder/demultiplexer) - Not suitable for high-power applications due to limited output current capacity

Working Principles

The MC74LCX138DTR2 operates based on the principles of digital logic gates. It takes three binary address inputs (A0, A1, A2) and decodes them into eight mutually exclusive outputs (Y0-Y7). The enable inputs (E1, E2) control the output states, allowing the selection of specific output lines.

When the enable inputs are active (low), the selected output line is determined by the binary address inputs. The other output lines remain inactive (high). The low-voltage operation and high-speed characteristics make this IC suitable for various decoding and demultiplexing applications.

Detailed Application Field Plans

The MC74LCX138DTR2 finds application in various fields where decoding and demultiplexing are required. Some potential application areas include:

  1. Address decoding in microcontrollers and microprocessors
  2. Data routing and selection in communication systems
  3. Memory addressing in computer systems
  4. Signal demultiplexing in digital audio and video equipment
  5. Control signal decoding in industrial automation systems

Detailed and Complete Alternative Models

  1. SN74LS138: 3-to-8 line decoder/demultiplexer, DIP-16 package
  2. CD74HC238E: High-speed CMOS 3-to-8 line decoder/demultiplexer, PDIP-16 package
  3. 74HCT138: 3-to-8 line decoder/demultiplexer, SOIC-16 package
  4. CD54HC138F3A: High-speed CMOS 3-to-8 line decoder/demultiplexer, CFP-16 package

These alternative models offer similar functionality to the MC74LCX138DTR2 and can be considered based on specific requirements and availability.

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Listen Sie 10 häufige Fragen und Antworten im Zusammenhang mit der Anwendung von MC74LCX138DTR2 in technischen Lösungen auf

Sure! Here are 10 common questions and answers related to the application of MC74LCX138DTR2:

  1. Q: What is MC74LCX138DTR2? A: MC74LCX138DTR2 is a 3-to-8 line decoder/demultiplexer integrated circuit (IC) that can be used in various technical solutions.

  2. Q: What is the purpose of MC74LCX138DTR2? A: The purpose of MC74LCX138DTR2 is to decode a 3-bit binary input and activate one of the eight output lines based on the input combination.

  3. Q: What voltage levels does MC74LCX138DTR2 support? A: MC74LCX138DTR2 supports voltage levels from 2.0V to 3.6V, making it compatible with both TTL and CMOS logic families.

  4. Q: How many inputs does MC74LCX138DTR2 have? A: MC74LCX138DTR2 has three input pins (A0, A1, and A2) to accept the 3-bit binary input.

  5. Q: How many output lines does MC74LCX138DTR2 have? A: MC74LCX138DTR2 has eight output pins (Y0-Y7) corresponding to the eight possible combinations of the 3-bit input.

  6. Q: Can MC74LCX138DTR2 be cascaded to increase the number of outputs? A: Yes, multiple MC74LCX138DTR2 ICs can be cascaded together to increase the number of outputs by connecting the enable (E) pin of subsequent ICs to the output of the previous IC.

  7. Q: What is the maximum output current of MC74LCX138DTR2? A: The maximum output current of MC74LCX138DTR2 is 24mA, which makes it suitable for driving LEDs, relays, and other low-power devices.

  8. Q: Does MC74LCX138DTR2 have any built-in protection features? A: Yes, MC74LCX138DTR2 has built-in ESD (Electrostatic Discharge) protection on all inputs and outputs to prevent damage from static electricity.

  9. Q: Can MC74LCX138DTR2 be used in both digital and analog applications? A: No, MC74LCX138DTR2 is specifically designed for digital applications and should not be used in analog circuits.

  10. Q: What is the package type of MC74LCX138DTR2? A: MC74LCX138DTR2 comes in a TSSOP-16 package, which is a small surface-mount package with 16 pins.

Please note that these answers are general and may vary depending on the specific datasheet and manufacturer's specifications of MC74LCX138DTR2.