Encyclopedia Entry: 74ACT158SC

Product Overview

Category

The 74ACT158SC belongs to the category of integrated circuits (ICs), specifically a multiplexer.

Use

This IC is commonly used in digital electronic systems for data selection and routing purposes. It allows multiple input signals to be selectively routed to a single output line.

Characteristics

• High-speed operation
• Low power consumption
• Wide operating voltage range
• Compatibility with TTL logic levels
• Schmitt-trigger inputs for noise immunity

Package

The 74ACT158SC is available in a small outline integrated circuit (SOIC) package. This package provides compactness and ease of integration into electronic circuit boards.

Essence

The essence of the 74ACT158SC lies in its ability to efficiently handle data routing tasks within digital systems, enabling effective signal management and control.

Packaging/Quantity

The 74ACT158SC is typically packaged in reels or tubes, containing a quantity of 250 or 1000 units per package, respectively.

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 5ns (max)
• Input Capacitance: 3pF (typ)
• Output Current: ±24mA

Detailed Pin Configuration

The 74ACT158SC has a total of 16 pins, each serving a specific function:

1. A0: Input A0
2. A1: Input A1
3. A2: Input A2
4. A3: Input A3
5. B: Input B
6. G: Enable Input
7. Y: Output Y
8. VCC: Positive Power Supply
9. AY: Output Enable
10. GND: Ground
11. Y: Output Y
12. B: Input B
13. A3: Input A3
14. A2: Input A2
15. A1: Input A1
16. A0: Input A0

Functional Features

The 74ACT158SC offers the following functional features:

• 4-input multiplexer with common select inputs (A0, A1, A2, A3)
• Single output line (Y) for data selection
• Enable input (G) to control the output state
• Output enable input (AY) for additional control flexibility

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient data routing in time-critical applications.
• Low power consumption contributes to energy-efficient system designs.
• Wide operating voltage range enhances compatibility with various digital systems.
• Schmitt-trigger inputs provide improved noise immunity, ensuring reliable signal processing.

Disadvantages

• Limited number of input lines may restrict the complexity of data selection scenarios.
• Propagation delay time may introduce timing constraints in certain applications.

Working Principles

The 74ACT158SC operates based on the principles of digital multiplexing. The select inputs (A0, A1, A2, A3) determine which input line (B0-B3) is connected to the output line (Y). The enable input (G) controls whether the output is active or in a high-impedance state. The output enable input (AY) further enhances control by enabling or disabling the output independently of the select inputs.

Detailed Application Field Plans

The 74ACT158SC finds application in various digital systems, including but not limited to: - Data communication equipment - Computer peripherals - Industrial automation systems - Consumer electronics - Automotive electronics

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to the 74ACT158SC are: - 74HC158: A similar multiplexer IC with compatible logic levels but lower speed. - CD4051: A CMOS analog multiplexer/demultiplexer IC with a wider range of applications. - SN74LS151: A TTL logic multiplexer IC with different characteristics and pin configuration.

These alternative models provide options for different performance requirements, compatibility needs, or specific application scenarios.

In conclusion, the 74ACT158SC is a versatile multiplexer IC that offers high-speed operation, low power consumption, and compatibility with TTL logic levels. Its compact package and wide operating voltage range make it suitable for various digital systems. While it has limitations in terms of input lines and propagation delay, its functional features and advantages outweigh these disadvantages. The working principles of the IC involve data selection based on select inputs and control signals. It finds application in diverse fields such as data communication, consumer electronics, and industrial automation. Alternative models like 74HC158, CD4051, and SN74LS151