ON Semiconductor
Hình ảnh có thể mang tính chất minh họa.
Xem thông số kỹ thuật để biết chi tiết sản phẩm.
MM74HC138MTC
Xem chi tiết DataSheets

MM74HC138MTC

Product Overview

  • Category: Integrated Circuit
  • Use: Decoding/Demultiplexing
  • Characteristics: High-speed operation, low power consumption
  • Package: 16-pin TSSOP
  • Essence: 3-to-8 line decoder/demultiplexer
  • Packaging/Quantity: Tape & Reel, 2500 units per reel

Specifications

  • Supply Voltage: 2V to 6V
  • High-Level Input Voltage: 2V to VCC
  • Low-Level Input Voltage: GND to 0.8V
  • Output Current: ±25mA
  • Propagation Delay: 15ns (max) at 5V
  • Operating Temperature: -40°C to 85°C

Detailed Pin Configuration

  1. A0 (Input)
  2. A1 (Input)
  3. A2 (Input)
  4. GND
  5. Y0 (Output)
  6. Y1 (Output)
  7. Y2 (Output)
  8. Y3 (Output)
  9. Y4 (Output)
  10. Y5 (Output)
  11. Y6 (Output)
  12. Y7 (Output)
  13. E1 (Enable Input)
  14. E2 (Enable Input)
  15. VCC
  16. NC (No Connection)

Functional Features

  • Decodes three binary weighted address inputs (A0, A1, A2) to eight mutually exclusive outputs (Y0 to Y7)
  • Active LOW enable inputs (E1, E2) to facilitate cascading of multiple devices
  • High-speed operation suitable for time-critical applications
  • Low power consumption makes it suitable for portable and battery-powered devices

Advantages and Disadvantages

Advantages

  • Versatile decoding/demultiplexing functionality
  • Wide operating voltage range
  • Compact 16-pin TSSOP package
  • Low propagation delay for time-sensitive applications

Disadvantages

  • Requires careful consideration of input signal levels due to narrow voltage margins
  • Limited output current may not be suitable for driving heavy loads

Working Principles

The MM74HC138MTC is a 3-to-8 line decoder/demultiplexer that takes three binary weighted address inputs and selects one of the eight outputs based on the combination of inputs. The active LOW enable inputs allow cascading of multiple devices to create larger decoding functions.

Detailed Application Field Plans

  • Address decoding in microprocessor systems
  • Memory selection in digital systems
  • Signal routing in communication equipment
  • Control signal generation in industrial automation

Detailed and Complete Alternative Models

  • SN74LS138N
  • CD74HCT138E
  • 74F138SCX

In conclusion, the MM74HC138MTC is a versatile integrated circuit with wide application in digital systems requiring address decoding and signal routing. Its high-speed operation, low power consumption, and compact package make it a popular choice for various electronic designs.

Word Count: 410

Liệt kê 10 câu hỏi và câu trả lời thường gặp liên quan đến ứng dụng MM74HC138MTC trong giải pháp kỹ thuật

  1. What is MM74HC138MTC?

    • The MM74HC138MTC is a 3-to-8 line decoder/demultiplexer with three enable inputs and is commonly used in digital electronic applications.

  2. What are the typical operating voltage and current for MM74HC138MTC?

    • The typical operating voltage for MM74HC138MTC is 2V to 6V, and the typical operating current is around 20mA.

  3. How does MM74HC138MTC function as a decoder?

    • MM74HC138MTC takes a binary input and selects one of the eight outputs based on the input combination, effectively decoding the input into one of the eight output lines.

  4. What are the common applications of MM74HC138MTC?

    • MM74HC138MTC is commonly used in address decoding, memory selection, data routing, and general digital logic applications.

  5. What are the key features of MM74HC138MTC?

    • Some key features include low power consumption, high noise immunity, and compatibility with TTL levels.

  6. How do I connect MM74HC138MTC in my circuit?

    • MM74HC138MTC can be connected by providing the necessary power supply, connecting the input lines, and using the enable inputs as needed for the specific application.

  7. What is the maximum output current capability of MM74HC138MTC?

    • The maximum output current capability of MM74HC138MTC is typically around 4mA per output.

  8. Can MM74HC138MTC be cascaded for larger decoding applications?

    • Yes, multiple MM74HC138MTCs can be cascaded to expand the decoding capability for larger applications.

  9. What are the temperature range and storage conditions for MM74HC138MTC?

    • MM74HC138MTC typically operates within a temperature range of -40°C to 85°C and should be stored in a dry, non-corrosive environment.

  10. Are there any common issues or considerations when using MM74HC138MTC?

    • It's important to consider proper decoupling and bypass capacitors, signal integrity, and power supply stability when using MM74HC138MTC in a design. Additionally, care should be taken to avoid exceeding the maximum ratings specified in the datasheet.