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74ACT257PC
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74ACT257PC

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Data Selector/Multiplexer
  • Characteristics: High-speed, low-power consumption, wide operating voltage range
  • Package: 16-pin DIP (Dual In-line Package)
  • Essence: The 74ACT257PC is a quad 2-input multiplexer that selects four bits of data from two sources using common select inputs.
  • Packaging/Quantity: Available in tubes or reels with varying quantities.

Specifications

  • Supply Voltage Range: 4.5V to 5.5V
  • Operating Temperature Range: -40°C to 85°C
  • Input Capacitance: 3pF
  • Propagation Delay: 5ns (max) at 5V
  • Output Drive Capability: 24mA (min)

Detailed Pin Configuration

  1. A1 (Input A1)
  2. B1 (Input B1)
  3. S (Select Input)
  4. Y (Output Y)
  5. A2 (Input A2)
  6. B2 (Input B2)
  7. GND (Ground)
  8. Y (Output Y)
  9. A3 (Input A3)
  10. B3 (Input B3)
  11. E (Enable Input)
  12. Y (Output Y)
  13. A4 (Input A4)
  14. B4 (Input B4)
  15. VCC (Supply Voltage)
  16. Y (Output Y)

Functional Features

  • Quad 2-input multiplexer
  • Common select input for data selection
  • High-speed operation
  • Low power consumption
  • Wide supply voltage range

Advantages and Disadvantages

Advantages

  • High-speed operation suitable for demanding applications
  • Low power consumption for energy-efficient designs
  • Wide supply voltage range allows for versatile use cases

Disadvantages

  • Limited output drive capability compared to some alternatives
  • Higher input capacitance may impact performance in high-frequency applications

Working Principles

The 74ACT257PC operates by selecting one of the two input data sources based on the state of the select input. When the enable input is active, the selected data is transferred to the output, providing a flexible means of data selection in digital circuits.

Detailed Application Field Plans

The 74ACT257PC finds application in various digital systems, including: - Multiplexing data inputs in microcontrollers and microprocessors - Address selection in memory devices - Signal routing in communication systems - Input selection in test and measurement equipment

Detailed and Complete Alternative Models

Some alternative models to the 74ACT257PC include: - 74HC257: Offers similar functionality with a different supply voltage range - SN74LS257: Provides comparable features with variations in speed and power consumption - CD74AC257: Another alternative with differences in package type and operating temperature range

This comprehensive entry provides an in-depth understanding of the 74ACT257PC, covering its specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models.

Word Count: 410

Luettele 10 yleistä kysymystä ja vastausta, jotka liittyvät 74ACT257PC :n soveltamiseen teknisissä ratkaisuissa

  1. What is the 74ACT257PC?

    • The 74ACT257PC is a quad 2-input multiplexer with 3-state outputs, commonly used in digital electronic applications.

  2. What are the key features of the 74ACT257PC?

    • The 74ACT257PC features four independent 2-input multiplexers with common select inputs and 3-state outputs.

  3. What are the typical applications of the 74ACT257PC?

    • Typical applications include data selection, signal routing, bus switching, and address decoding in digital systems.

  4. What is the operating voltage range of the 74ACT257PC?

    • The 74ACT257PC operates within a voltage range of 2.0V to 6.0V, making it suitable for various digital system designs.

  5. How does the 3-state output feature benefit the application?

    • The 3-state output allows the outputs to be disabled, effectively disconnecting them from the bus, which can prevent bus contention issues.

  6. Can the 74ACT257PC handle high-speed data signals?

    • Yes, the 74ACT257PC is designed to handle high-speed data signals, making it suitable for applications requiring fast switching.

  7. What is the maximum propagation delay of the 74ACT257PC?

    • The maximum propagation delay is typically around 5ns, ensuring efficient signal routing and minimal delay in the application.

  8. How many control inputs does the 74ACT257PC have?

    • The 74ACT257PC has two control inputs per multiplexer, allowing for flexible selection of input data.

  9. Is the 74ACT257PC compatible with standard TTL logic levels?

    • Yes, the 74ACT257PC is fully compatible with standard TTL logic levels, providing ease of integration into existing designs.

  10. Are there any specific layout or decoupling considerations for using the 74ACT257PC?

    • It is recommended to follow proper PCB layout practices and provide adequate decoupling capacitors near the power supply pins to ensure stable operation and minimize noise.