Texas Instruments
Hình ảnh có thể mang tính chất minh họa.
Xem thông số kỹ thuật để biết chi tiết sản phẩm.
SN74LS257BDR
Xem chi tiết DataSheets

SN74LS257BDR

Product Overview

Category

SN74LS257BDR belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronics for data multiplexing applications.

Characteristics

  • Low power consumption
  • High-speed operation
  • Wide operating voltage range
  • Compatibility with TTL logic levels

Package

SN74LS257BDR is available in a small outline package (SOIC) with 16 pins.

Essence

The essence of SN74LS257BDR lies in its ability to select and route data from multiple sources to a single output line.

Packaging/Quantity

SN74LS257BDR is typically packaged in reels or tubes, with each reel containing 2500 units.

Specifications

  • Supply Voltage: 4.75V to 5.25V
  • Input Voltage: 2V (maximum)
  • Output Voltage: 2.7V (minimum), 3.4V (maximum)
  • Operating Temperature Range: -40°C to +85°C
  • Propagation Delay Time: 9ns (typical)

Detailed Pin Configuration

  1. A0: Data input A0
  2. B0: Data input B0
  3. C0: Data input C0
  4. D0: Data input D0
  5. G: Enable input
  6. Y: Multiplexed output
  7. VCC: Positive supply voltage
  8. A1: Data input A1
  9. B1: Data input B1
  10. C1: Data input C1
  11. D1: Data input D1
  12. GND: Ground
  13. A2: Data input A2
  14. B2: Data input B2
  15. C2: Data input C2
  16. D2: Data input D2

Functional Features

SN74LS257BDR is a quad 2-line to 1-line data selector/multiplexer. It allows the selection of one out of four data inputs based on the control inputs A0, A1, and A2. The selected data is then routed to the output pin Y.

Advantages and Disadvantages

Advantages

  • Low power consumption makes it suitable for battery-powered devices.
  • High-speed operation enables efficient data processing.
  • Wide operating voltage range provides flexibility in various applications.
  • Compatibility with TTL logic levels ensures easy integration into existing systems.

Disadvantages

  • Limited number of input lines may restrict its use in complex multiplexing scenarios.
  • Propagation delay time may affect real-time applications requiring immediate data selection.

Working Principles

SN74LS257BDR operates by using the control inputs A0, A1, and A2 to select one of the four data inputs (A, B, C, or D). The selected data is then passed through internal circuitry and routed to the output pin Y. The enable input G controls the overall operation of the IC.

Detailed Application Field Plans

SN74LS257BDR finds application in various fields, including: 1. Digital communication systems 2. Data acquisition systems 3. Industrial automation 4. Automotive electronics 5. Consumer electronics

Detailed and Complete Alternative Models

Some alternative models that can be used as substitutes for SN74LS257BDR are: 1. CD74HC257E 2. MC74HC257N 3. 74HCT257N 4. CD74ACT257M 5. SN74LVC257APW

These alternatives offer similar functionality and can be chosen based on specific requirements and availability.

Word count: 409 words

Liệt kê 10 câu hỏi và câu trả lời thường gặp liên quan đến ứng dụng SN74LS257BDR trong giải pháp kỹ thuật

Sure! Here are 10 common questions and answers related to the application of SN74LS257BDR:

  1. Question: What is SN74LS257BDR?
    Answer: SN74LS257BDR is a quad 2-input multiplexer with 3-state outputs, commonly used in digital logic circuits.

  2. Question: What is the purpose of SN74LS257BDR?
    Answer: SN74LS257BDR is used to select one of four data inputs and route it to a single output based on the control inputs.

  3. Question: What is the maximum operating voltage for SN74LS257BDR?
    Answer: The maximum operating voltage for SN74LS257BDR is 5.25V.

  4. Question: How many control inputs does SN74LS257BDR have?
    Answer: SN74LS257BDR has two control inputs, typically labeled as A and B.

  5. Question: What is the function of the control inputs in SN74LS257BDR?
    Answer: The control inputs determine which data input is selected and routed to the output.

  6. Question: Can SN74LS257BDR be used in both synchronous and asynchronous applications?
    Answer: Yes, SN74LS257BDR can be used in both synchronous and asynchronous applications.

  7. Question: What is the output configuration of SN74LS257BDR?
    Answer: SN74LS257BDR has 3-state outputs, allowing the output to be disconnected from the circuit when not in use.

  8. Question: What is the maximum operating frequency of SN74LS257BDR?
    Answer: The maximum operating frequency of SN74LS257BDR is typically around 33 MHz.

  9. Question: Can SN74LS257BDR handle both TTL and CMOS logic levels?
    Answer: Yes, SN74LS257BDR is compatible with both TTL and CMOS logic levels.

  10. Question: What are some common applications of SN74LS257BDR?
    Answer: SN74LS257BDR is commonly used in data multiplexing, address decoding, and bus switching applications.

Please note that these answers are general and may vary depending on the specific requirements and implementation of SN74LS257BDR in a technical solution.