Encyclopedia Entry: 74ACT158SCX

Product Overview

Category

The 74ACT158SCX belongs to the category of integrated circuits (ICs) and specifically falls under the family of digital multiplexers.

Use

This IC is primarily used for data selection and routing in digital systems. It allows multiple input signals to be selectively routed to a single output line, based on control inputs.

Characteristics

• High-speed operation: The 74ACT158SCX is designed to operate at high clock frequencies, making it suitable for time-critical applications.
• Low power consumption: This IC is optimized for low power consumption, ensuring efficient energy usage.
• Wide operating voltage range: It can operate within a wide voltage range, typically between 2V and 6V.
• Compatibility: The 74ACT158SCX is compatible with both TTL and CMOS logic families, allowing seamless integration into various digital systems.

Package and Quantity

The 74ACT158SCX is available in a small outline integrated circuit (SOIC) package. It consists of 16 pins and is commonly supplied in tape and reel packaging. Each reel typically contains 2500 units.

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: 5 ns (max)
• Input Capacitance: 3 pF (typ)
• Output Current: ±24 mA (max)

Pin Configuration

The 74ACT158SCX has a total of 16 pins, which are assigned specific functions as follows:

1. A0: Data Input A0
2. A1: Data Input A1
3. A2: Data Input A2
4. A3: Data Input A3
5. B: Data Input B
6. C: Data Input C
7. D: Data Input D
8. G: Enable Input
9. Y: Multiplexer Output
10. Vcc: Positive Power Supply
11. GND: Ground
12. NC: No Connection
13. NC: No Connection
14. NC: No Connection
15. NC: No Connection
16. NC: No Connection

Functional Features

The 74ACT158SCX offers the following functional features:

• 4-to-1 data selection: It allows four different input signals (A0, A1, A2, and A3) to be selectively routed to the output line (Y) based on the control inputs (B, C, D).
• Enable control: The enable input (G) can be used to activate or deactivate the multiplexer, providing flexibility in data routing.
• Fast switching speed: With a propagation delay time of only 5 ns, this IC ensures rapid data selection and minimal signal distortion.

Advantages and Disadvantages

Advantages

• High-speed operation enables efficient data selection in time-critical applications.
• Low power consumption contributes to energy efficiency.
• Wide operating voltage range allows compatibility with various digital systems.
• Compatibility with TTL and CMOS logic families simplifies integration.

Disadvantages

• Limited to 4-to-1 data selection, may not be suitable for applications requiring larger multiplexing capabilities.
• Availability in SOIC package limits its use in certain space-constrained designs.

Working Principles

The 74ACT158SCX operates based on the principles of digital multiplexing. When the enable input (G) is active, the control inputs (B, C, D) determine which of the four data inputs (A0, A1, A2, A3) is routed to the output (Y). The selected data input appears at the output with minimal delay.

Application Field Plans

The 74ACT158SCX finds applications in various digital systems where data selection and routing are required. Some specific application areas include:

• Data communication systems
• Digital signal processing
• Multiplexed data transmission
• Address decoding in microprocessors
• Control circuitry in industrial automation

Alternative Models

For users seeking alternatives to the 74ACT158SCX, several similar ICs are available in the market. These include:

• 74HC158: A CMOS-based 4-to-1 multiplexer with comparable characteristics.
• CD4052: A dual 4-channel analog multiplexer/demultiplexer offering extended functionality.
• SN74LS157: A TTL-based quad 2-line to 1-line data selector/multiplexer suitable for simpler applications.

These alternative models provide similar data selection capabilities but may differ in terms of voltage range, power consumption, and package options.

In conclusion, the 74ACT158SCX is a versatile integrated circuit that