SN74AS257DRE4

Product Overview

Category: Integrated Circuit (IC)
Use: Data Selector/Multiplexer
Characteristics: High-speed, low-power, 3-state outputs
Package: SOIC (Small Outline Integrated Circuit)
Essence: A quad 2-input multiplexer with 3-state outputs
Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

Supply Voltage Range: 4.5V to 5.5V
Input Voltage Range: 0V to VCC
Operating Temperature Range: -40°C to +85°C
Propagation Delay Time: 9ns (typical)
Output Current: ±24mA
Input Capacitance: 3pF
Output Capacitance: 15pF

Detailed Pin Configuration

The SN74AS257DRE4 has a 16-pin SOIC package with the following pin configuration:

A0 - Select Input A
B0 - Select Input B
Y0 - Multiplexer Output Y
GND - Ground
Y1 - Multiplexer Output Y
B1 - Select Input B
A1 - Select Input A
Y2 - Multiplexer Output Y
GND - Ground
Y3 - Multiplexer Output Y
B2 - Select Input B
A2 - Select Input A
Y3 - Multiplexer Output Y
GND - Ground
VCC - Power Supply
OE - Output Enable

Functional Features

Quad 2-input multiplexer with 3-state outputs
Allows selection of one out of four data inputs
3-state outputs provide high impedance when disabled
Low power consumption
High-speed operation

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient data selection - Low power consumption helps in reducing overall energy usage - 3-state outputs provide flexibility in connecting multiple devices

Disadvantages: - Limited to a maximum of four data inputs - Requires external control signals for proper operation

Working Principles

The SN74AS257DRE4 is a multiplexer IC that selects one out of four data inputs based on the select inputs (A0, A1, A2, B0, B1, B2). The selected data is then routed to the corresponding output (Y0, Y1, Y2, Y3). The output enable (OE) pin controls the 3-state outputs, allowing them to be either active or in high impedance state.

Detailed Application Field Plans

The SN74AS257DRE4 can be used in various applications, including: - Data routing and selection in digital systems - Address decoding in memory systems - Input/output expansion in microcontrollers - Multiplexing control signals in communication systems

Detailed and Complete Alternative Models

Some alternative models that serve similar functions to the SN74AS257DRE4 are: - CD74HC157E - MC74HC157N - 74F157PC - SN74LS157N

These alternatives offer similar functionality and can be used as replacements depending on specific requirements.

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Sebutkan 10 pertanyaan dan jawaban umum terkait penerapan SN74AS257DRE4 dalam solusi teknis

Sure! Here are 10 common questions and answers related to the application of SN74AS257DRE4 in technical solutions:

Q: What is SN74AS257DRE4? A: SN74AS257DRE4 is a quad 2-input multiplexer with 3-state outputs, commonly used in digital logic circuits.
Q: What is the operating voltage range for SN74AS257DRE4? A: The operating voltage range for SN74AS257DRE4 is typically between 4.5V and 5.5V.
Q: How many inputs does SN74AS257DRE4 have? A: SN74AS257DRE4 has four 2-input multiplexers, allowing you to select one of the four input signals.
Q: What are the typical applications of SN74AS257DRE4? A: SN74AS257DRE4 is commonly used in data routing, signal selection, and bus switching applications.
Q: What is the maximum output current of SN74AS257DRE4? A: The maximum output current of SN74AS257DRE4 is typically around 24mA.
Q: Can SN74AS257DRE4 handle high-speed signals? A: Yes, SN74AS257DRE4 is designed to handle high-speed signals and has a propagation delay of around 9ns.
Q: Does SN74AS257DRE4 have internal pull-up or pull-down resistors? A: No, SN74AS257DRE4 does not have internal pull-up or pull-down resistors. External resistors may be required.
Q: What is the package type of SN74AS257DRE4? A: SN74AS257DRE4 is available in a 16-pin SOIC (Small Outline Integrated Circuit) package.
Q: Can SN74AS257DRE4 be used in both digital and analog circuits? A: SN74AS257DRE4 is primarily designed for digital logic applications and may not be suitable for analog circuits.
Q: Are there any specific precautions to consider when using SN74AS257DRE4? A: It is important to ensure that the power supply voltage does not exceed the specified range, and to follow the recommended operating conditions provided in the datasheet for optimal performance.

Please note that these answers are general and may vary depending on the specific requirements and datasheet of SN74AS257DRE4.