DM74LS257BN

Product Overview

Category

DM74LS257BN belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used for data multiplexing applications.

Characteristics

• Package: DIP (Dual In-line Package)
• Essence: Quad 2-input multiplexer with tri-state outputs
• Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier

Specifications

The DM74LS257BN has the following specifications:

• Supply Voltage: 4.75V to 5.25V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: 0°C to 70°C
• Propagation Delay Time: 15ns (typical)
• High-Level Output Current: -0.4mA (maximum)
• Low-Level Output Current: 8mA (maximum)

Detailed Pin Configuration

The DM74LS257BN has a total of 16 pins. The pin configuration is as follows:

1. A0 - Data Input A0
2. B0 - Data Input B0
3. A1 - Data Input A1
4. B1 - Data Input B1
5. G - Enable Input
6. Y0 - Multiplexed Output Y0
7. Y1 - Multiplexed Output Y1
8. Y2 - Multiplexed Output Y2
9. Y3 - Multiplexed Output Y3
10. VCC - Positive Power Supply
11. Y3 - Multiplexed Output Y3
12. Y2 - Multiplexed Output Y2
13. Y1 - Multiplexed Output Y1
14. Y0 - Multiplexed Output Y0
15. G - Enable Input
16. GND - Ground

Functional Features

The DM74LS257BN offers the following functional features:

• Quad 2-input multiplexer with tri-state outputs
• Allows selection of one of four data inputs to be routed to the output
• Tri-state outputs enable high impedance state when disabled

Advantages and Disadvantages

Advantages

• Provides efficient data multiplexing functionality
• Tri-state outputs allow for easy bus sharing
• Compact DIP package for easy integration into circuits

Disadvantages

• Limited to 4 data inputs, may not be suitable for applications requiring more inputs
• Propagation delay time may affect real-time applications

Working Principles

The DM74LS257BN works by using the enable input (G) to control the selection of one of the four data inputs (A0, B0, A1, B1) to be routed to the outputs (Y0, Y1, Y2, Y3). When the enable input is low, the outputs are in a high impedance state. The selected data input is then passed through to the corresponding output.

Detailed Application Field Plans

The DM74LS257BN can be used in various applications, including but not limited to:

1. Data multiplexing in digital communication systems
2. Address decoding in memory systems
3. Input/output expansion in microcontroller-based systems
4. Bus sharing in multi-device communication networks

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the DM74LS257BN include:

1. SN74LS257N
2. CD74LS257E
3. MC74LS257D
4. 74HC257N

These alternative models can be considered based on specific requirements and availability.

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