STMicroelectronics
Billedet kan være en repræsentation.
Se specifikationer for produktdetaljer.
74LCX138TTR
Se detaljer DataSheets

74LCX138TTR

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Decoding and demultiplexing
  • Characteristics: Low voltage, low power consumption, high-speed operation
  • Package: TSSOP (Thin Shrink Small Outline Package)
  • Essence: 3-to-8 line decoder/demultiplexer
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Supply Voltage: 1.65V to 3.6V
  • Input Voltage: -0.5V to VCC + 0.5V
  • Output Voltage: -0.5V to VCC + 0.5V
  • Operating Temperature: -40°C to +85°C
  • Propagation Delay: 4.2 ns (typical)
  • Output Current: ±24 mA

Detailed Pin Configuration

The 74LCX138TTR has a total of 16 pins:

  1. GND (Ground)
  2. A0 (Address Input 0)
  3. A1 (Address Input 1)
  4. A2 (Address Input 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 Power Supply)
  16. NC (No Connection)

Functional Features

  • Decodes three binary address inputs into eight mutually exclusive outputs
  • Demultiplexes one input into eight outputs based on the address inputs
  • Low voltage operation allows compatibility with a wide range of systems
  • High-speed operation enables efficient data processing

Advantages and Disadvantages

Advantages: - Low power consumption - Wide operating voltage range - Fast propagation delay - Compact package size

Disadvantages: - Limited number of address inputs (3) - Limited number of output lines (8)

Working Principles

The 74LCX138TTR is a 3-to-8 line decoder/demultiplexer IC. It takes three binary address inputs (A0, A1, A2) and generates eight mutually exclusive outputs (Y0-Y7). The enable inputs (E1, E2) control the operation of the decoder/demultiplexer. When enabled, the IC decodes the address inputs and activates the corresponding output line.

Detailed Application Field Plans

The 74LCX138TTR can be used in various applications, including but not limited to:

  1. Address decoding in microcontrollers and microprocessors
  2. Memory selection in digital systems
  3. Data routing and distribution in communication systems
  4. Control signal generation in industrial automation
  5. Multiplexing and demultiplexing in data transmission

Detailed and Complete Alternative Models

Some alternative models that serve similar functions to the 74LCX138TTR include:

  1. 74HC138: High-speed CMOS logic decoder/demultiplexer
  2. CD74AC138: Advanced CMOS logic decoder/demultiplexer
  3. SN54LS138: Low-power Schottky TTL decoder/demultiplexer

These alternatives offer different specifications and features, allowing users to choose the most suitable option for their specific requirements.

Word count: 399 words

Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af 74LCX138TTR i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of 74LCX138TTR in technical solutions:

  1. Q: What is the 74LCX138TTR? A: The 74LCX138TTR is a 3-to-8 line decoder/demultiplexer integrated circuit (IC) that can be used in digital logic circuits.

  2. Q: What is the purpose of a decoder/demultiplexer? A: A decoder/demultiplexer takes an input signal and selects one of several output lines based on the input value, allowing for data distribution or decoding operations.

  3. Q: How many inputs does the 74LCX138TTR have? A: The 74LCX138TTR has three input pins (A0, A1, and A2) which can be used to select one of eight output lines.

  4. Q: How many output lines does the 74LCX138TTR have? A: The 74LCX138TTR has eight output pins (Y0-Y7) corresponding to the eight possible combinations of the input pins.

  5. Q: What is the voltage supply range for the 74LCX138TTR? A: The 74LCX138TTR operates with a voltage supply range of 2.0V to 3.6V.

  6. Q: Can the 74LCX138TTR handle high-speed applications? A: Yes, the 74LCX138TTR is designed for high-speed operation and has a maximum propagation delay of 4.5 ns.

  7. Q: Is the 74LCX138TTR compatible with TTL logic levels? A: Yes, the 74LCX138TTR is compatible with both TTL and CMOS logic levels, making it versatile for various applications.

  8. Q: Can the 74LCX138TTR be cascaded to increase the number of output lines? A: Yes, multiple 74LCX138TTR ICs can be cascaded together to create larger decoder/demultiplexer circuits with more output lines.

  9. Q: What is the power consumption of the 74LCX138TTR? A: The 74LCX138TTR has low power consumption, typically drawing around 10µA of current.

  10. Q: Are there any specific precautions to consider when using the 74LCX138TTR? A: It is important to ensure that the voltage supply does not exceed the specified range, and proper decoupling capacitors should be used to minimize noise and stabilize the power supply.

Please note that these answers are general and may vary depending on the specific application or circuit design.