DM74LS251N

Product Overview

Category

DM74LS251N belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronics for data multiplexing and selection purposes.

Characteristics

• Package: DIP (Dual In-line Package)
• Essence: 8-input multiplexer with tri-state outputs
• Packaging/Quantity: Available in tubes or reels, typically sold in quantities of 25 or more

Specifications

The DM74LS251N 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)
• Output Current: ±8mA

Pin Configuration

The pin configuration of DM74LS251N is as follows:

+---+--+---+ S0 -|1 +--+ 16|- VCC S1 -|2 15|- Y7 S2 -|3 14|- Y6 E -|4 13|- Y5 GND -|5 74LS251N 12|- Y4 A0 -|6 11|- Y3 A1 -|7 10|- Y2 A2 -|8 9|- Y1 +-----------+

Functional Features

The DM74LS251N offers the following functional features:

• 8-input multiplexer with common select inputs (S0, S1, S2)
• Tri-state outputs (Y1-Y7) for easy bus interfacing
• Enable input (E) to control the output state

Advantages and Disadvantages

Advantages

• Versatile multiplexing capabilities
• Tri-state outputs facilitate bus sharing
• Wide operating temperature range

Disadvantages

• Limited number of inputs (8)
• Propagation delay may affect timing-sensitive applications

Working Principles

The DM74LS251N operates by selecting one of the eight input lines based on the binary values applied to the select inputs (S0, S1, S2). The selected input is then routed to the corresponding output line (Y1-Y7). The enable input (E) controls whether the outputs are active or in a high-impedance state.

Detailed Application Field Plans

The DM74LS251N finds applications in various fields, including:

1. Data multiplexing in digital communication systems
2. Address decoding in microprocessor-based systems
3. Input selection in data acquisition systems
4. Bus interfacing in computer architectures
5. Logic circuit design for complex digital systems

Alternative Models

Here are some alternative models that offer similar functionality:

1. SN74LS151
2. CD4051B
3. MC14051B
4. 74HC151

These alternatives can be considered based on specific requirements and availability.

In conclusion, the DM74LS251N is a versatile 8-input multiplexer IC with tri-state outputs. It finds applications in various fields, offering advantages such as easy bus interfacing and wide operating temperature range. However, it has limitations in terms of the number of inputs and propagation delay. Alternative models like SN74LS151 and CD4051B can be explored based on specific needs.