Texas Instruments
Bild kan vara representation.
Se specifikationer för produktinformation.
CD74AC138EG4
Visa detalj Datablad

CD74AC138EG4

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Decoder/Demultiplexer
  • Characteristics: High-speed, low-power, 3-to-8 line decoder/demultiplexer
  • Package: 16-pin SOIC (Small Outline Integrated Circuit)
  • Essence: Decodes a 3-bit binary input to one of eight outputs
  • Packaging/Quantity: Available in reels of 2500 units

Specifications

  • Supply Voltage: 2V to 6V
  • Input Voltage: 0V to VCC
  • Output Voltage: 0V to VCC
  • Operating Temperature: -40°C to +85°C
  • Propagation Delay: 5.5 ns (typical)
  • Output Current: ±24 mA

Detailed Pin Configuration

The CD74AC138EG4 has the following pin configuration:

  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 (Positive Power Supply)

Functional Features

  • Decodes a 3-bit binary input to one of eight outputs
  • Enables individual output lines based on the input combination
  • High-speed operation with minimal power consumption
  • Compatible with TTL (Transistor-Transistor Logic) input levels
  • Schmitt-trigger action on all inputs for improved noise immunity

Advantages and Disadvantages

Advantages

  • High-speed operation allows for quick decoding of input signals
  • Low-power consumption makes it suitable for battery-powered devices
  • Schmitt-trigger action enhances noise immunity, ensuring reliable operation
  • Wide operating voltage range provides flexibility in various applications

Disadvantages

  • Limited to 3-bit binary input decoding, may not be suitable for complex applications requiring higher bit counts
  • Only available in a specific package (16-pin SOIC), which may not be compatible with all circuit designs

Working Principles

The CD74AC138EG4 is a decoder/demultiplexer IC that takes a 3-bit binary input and selects one of eight output lines based on the input combination. The enable inputs (E1 and E2) control the operation of the decoder. When both enable inputs are high, the decoder is enabled, and the selected output line reflects the input combination.

Detailed Application Field Plans

The CD74AC138EG4 can be used in various applications, 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 in industrial automation

Detailed and Complete Alternative Models

Some alternative models to the CD74AC138EG4 include:

  1. SN74LS138: A TTL-compatible 3-to-8 line decoder/demultiplexer
  2. CD4514: A 4-to-16 line decoder/demultiplexer with latched outputs
  3. 74HC238: A high-speed CMOS 3-to-8 line decoder/demultiplexer
  4. CD4028: A BCD-to-decimal decoder/demultiplexer

These alternative models offer similar functionality but may have different specifications, pin configurations, or package options.

Word count: 413 words

Lista 10 Vanliga frågor och svar relaterade till tillämpningen av CD74AC138EG4 i tekniska lösningar

Sure! Here are 10 common questions and answers related to the application of CD74AC138EG4 in technical solutions:

  1. Q: What is CD74AC138EG4? A: CD74AC138EG4 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 purpose of CD74AC138EG4? A: The purpose of CD74AC138EG4 is to decode a binary input and activate one of the eight output lines based on the input value.

  3. Q: What voltage levels does CD74AC138EG4 support? A: CD74AC138EG4 supports a wide range of voltage levels, typically from 2V to 6V.

  4. Q: How many inputs does CD74AC138EG4 have? A: CD74AC138EG4 has three inputs: A0, A1, and A2, which together form a 3-bit binary input.

  5. Q: How many output lines does CD74AC138EG4 have? A: CD74AC138EG4 has eight output lines, labeled Y0 to Y7.

  6. Q: Can CD74AC138EG4 be cascaded to increase the number of outputs? A: Yes, multiple CD74AC138EG4 ICs can be cascaded together to increase the number of outputs beyond eight.

  7. Q: What is the maximum current that CD74AC138EG4 can source or sink on its output pins? A: CD74AC138EG4 can source or sink up to 24mA of current on each output pin.

  8. Q: Is CD74AC138EG4 compatible with TTL logic levels? A: Yes, CD74AC138EG4 is compatible with both TTL and CMOS logic levels.

  9. Q: Can CD74AC138EG4 be used in multiplexing applications? A: Yes, CD74AC138EG4 can be used as a demultiplexer to select one of the eight output lines based on the input value.

  10. Q: What are some common applications of CD74AC138EG4? A: CD74AC138EG4 is commonly used in address decoding, memory selection, data routing, and general-purpose digital logic circuits.

Please note that these answers are general and may vary depending on specific use cases and requirements.