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74ACT257SCX
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Encyclopedia Entry: 74ACT257SCX

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Data Selector/Multiplexer
  • Characteristics: High-speed, low-power consumption
  • Package: SC70-16
  • Essence: Logic IC for data selection and multiplexing
  • Packaging/Quantity: Available in tape and reel packaging, quantity varies based on supplier

Specifications

  • Logic Family: ACT
  • Number of Inputs: 4
  • Number of Outputs: 1
  • Supply Voltage: 2.0V to 6.0V
  • Operating Temperature Range: -40°C to +85°C
  • Propagation Delay: 5ns (typical)
  • Output Current: ±24mA
  • Input Capacitance: 3pF (typical)

Detailed Pin Configuration

The 74ACT257SCX has a total of 16 pins arranged as follows:

__ __ A1 |1 \__/ 16| VCC B1 |2 15| Y A2 |3 14| B B2 |4 13| C G1 |5 74 12| GND G2 |6 ACT257 11| D Y1 |7 SCX 10| C Y2 |8 9| D -- --

Functional Features

  • The 74ACT257SCX is a quad 2-input multiplexer with common select inputs (S) and an output enable input (G).
  • It allows the user to select one of the four data inputs (A1/B1, A2/B2, C, or D) to be routed to the output (Y) based on the select inputs.
  • The output enable input (G) can be used to disable the outputs, putting them in a high-impedance state.

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient data selection and multiplexing. - Low-power consumption makes it suitable for battery-powered devices. - Wide supply voltage range enables compatibility with various systems.

Disadvantages: - Limited number of inputs and outputs may not meet the requirements of complex applications. - Propagation delay may introduce timing issues in certain high-speed applications.

Working Principles

The 74ACT257SCX operates based on the principles of digital logic. It utilizes internal circuitry to route the selected data input to the output based on the select inputs. The output enable input allows the user to control the output state, enabling or disabling the outputs as needed.

Detailed Application Field Plans

The 74ACT257SCX is commonly used in various digital systems where data selection and multiplexing are required. Some specific application fields include: 1. Data communication systems 2. Industrial automation 3. Test and measurement equipment 4. Audio/video processing 5. Computer peripherals

Detailed and Complete Alternative Models

  • 74HC257: Similar functionality but operates at a lower voltage range (2.0V to 6.0V).
  • 74LS257: Compatible with TTL logic levels but has slower speed compared to ACT family.
  • CD4051: Analog multiplexer/demultiplexer IC with similar pin configuration.

Note: This entry provides a brief overview of the 74ACT257SCX. For more detailed information, please refer to the datasheet provided by the manufacturer.

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Sebutkan 10 pertanyaan dan jawaban umum terkait penerapan 74ACT257SCX dalam solusi teknis

Sure! Here are 10 common questions and answers related to the application of 74ACT257SCX in technical solutions:

  1. Q: What is the 74ACT257SCX? A: The 74ACT257SCX is a quad 2-input multiplexer with 3-state outputs, commonly used in digital logic circuits.

  2. Q: What is the purpose of a multiplexer? A: A multiplexer is used to select one of several input signals and route it to a single output line based on control inputs.

  3. Q: How many inputs does the 74ACT257SCX have? A: The 74ACT257SCX has four data inputs (A, B, C, D) and two select inputs (S0, S1).

  4. Q: How many outputs does the 74ACT257SCX have? A: The 74ACT257SCX has four outputs (Y0, Y1, Y2, Y3), each corresponding to one of the data inputs.

  5. Q: What is the function of the select inputs (S0, S1)? A: The select inputs determine which data input is connected to the outputs. The combination of S0 and S1 determines the active input.

  6. Q: Can the 74ACT257SCX handle different voltage levels? A: Yes, the 74ACT257SCX is compatible with both TTL and CMOS voltage levels, making it versatile for various applications.

  7. Q: Does the 74ACT257SCX have 3-state outputs? A: Yes, the 74ACT257SCX has 3-state outputs, allowing the outputs to be disabled or put into a high-impedance state when not in use.

  8. Q: What is the maximum operating frequency of the 74ACT257SCX? A: The 74ACT257SCX can operate at frequencies up to 125 MHz, making it suitable for high-speed applications.

  9. Q: Can the 74ACT257SCX be cascaded to increase the number of inputs? A: Yes, multiple 74ACT257SCX chips can be cascaded together to increase the number of inputs and outputs in a system.

  10. Q: What are some common applications of the 74ACT257SCX? A: The 74ACT257SCX is commonly used in data routing, signal selection, address decoding, and bus switching applications in digital systems.

Please note that these answers are general and may vary depending on specific circuit designs and requirements.