SN74LS257BDG4

Product Overview

Category

SN74LS257BDG4 belongs to the category of integrated circuits (ICs).

Use

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

Characteristics

• Low-power Schottky technology
• Quad 2-line to 1-line data selector/multiplexer
• High-speed operation
• Wide operating voltage range: 4.75V to 5.25V
• Output drive capability: 10 LSTTL loads
• Package type: SOIC (Small Outline Integrated Circuit)
• RoHS compliant

Packaging/Quantity

SN74LS257BDG4 is typically packaged in a tube or reel, containing a quantity of 250 units per package.

Specifications

• Supply Voltage Range: 4.75V to 5.25V
• Input Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 15ns (max)
• Output Current: ±8mA
• Power Dissipation: 500mW (max)

Detailed Pin Configuration

The SN74LS257BDG4 IC has a total of 16 pins, which are assigned specific functions as follows:

1. A0: Data input line 0
2. A1: Data input line 1
3. B: Data input line 2
4. C: Data input line 3
5. G: Enable input (active low)
6. Y: Multiplexed output
7. Ybar: Complementary output of Y
8. VCC: Positive power supply
9. A2: Data input line 4
10. A3: Data input line 5
11. D: Data input line 6
12. E: Data input line 7
13. F: Data input line 8
14. GND: Ground
15. Ybarbar: Complementary output of Ybar
16. Ybarbarbar: Complementary output of Ybarbar

Functional Features

The SN74LS257BDG4 is a quad 2-line to 1-line data selector/multiplexer IC. It allows the selection of one out of four data inputs and routes it to the output based on the control inputs. The enable input (G) controls the operation of the multiplexer. When G is low, the selected data input is transmitted to the output. When G is high, all outputs are in a high-impedance state.

Advantages and Disadvantages

Advantages

• Low-power consumption
• High-speed operation
• Wide operating voltage range
• RoHS compliant

Disadvantages

• Limited number of data inputs (4)

Working Principles

The SN74LS257BDG4 operates by using a combination of logic gates and transistors to select and route the desired data input to the output. The enable input (G) determines whether the multiplexer is active or in a high-impedance state.

Detailed Application Field Plans

SN74LS257BDG4 finds applications in various digital systems, including but not limited to: - Data multiplexing in microcontrollers - Address decoding in memory systems - Data routing in communication systems - Input selection in digital audio/video equipment

Detailed and Complete Alternative Models

Some alternative models that can be used as substitutes for SN74LS257BDG4 include: - CD74HC257E - MC74HC257N - 74HCT257N - SN74HC257N

These alternatives offer similar functionality and characteristics, allowing users to choose the most suitable option for their specific requirements.

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