Encyclopedia Entry: 74ACT157SJX

Product Overview

Category

The 74ACT157SJX belongs to the category of integrated circuits (ICs) and specifically falls under the family of multiplexers.

Use

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

Characteristics

• High-speed operation: The 74ACT157SJX is designed to operate at high clock frequencies, making it suitable for applications requiring fast data switching.
• Low power consumption: This IC is optimized for low power consumption, making it energy-efficient.
• Wide operating voltage range: It can operate within a wide voltage range, typically between 2V and 6V.
• Compatibility: The 74ACT157SJX is compatible with both TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor) logic levels.

Package and Quantity

The 74ACT157SJX is available in a small outline integrated circuit (SOIC) package. It is supplied in tape and reel packaging, with a quantity of 250 units per reel.

Specifications

• Number of Inputs: 4
• Number of Control Inputs: 2
• Number of Outputs: 1
• Operating Voltage Range: 2V to 6V
• Maximum Clock Frequency: 100 MHz
• Propagation Delay Time: 5 ns (typical)
• Input/Output Logic Levels: TTL/CMOS compatible

Pin Configuration

The pin configuration of the 74ACT157SJX is as follows:

+---+--+---+ A0 -|1 +--+ 16|- VCC A1 -|2 15|- Y B0 -|3 14|- B B1 -|4 74ACT 13|- C G1 -|5 157 12|- D G2 -|6 SJX 11|- GND Y0 -|7 10|- C Y1 -|8 9|- D +----------+

Functional Features

The 74ACT157SJX offers the following functional features:

• Data Selection: It allows for the selection of one of four input lines to be routed to the output line, based on the control inputs.
• Multiplexing: The IC can be used to multiplex multiple data sources into a single output line.
• High-Speed Operation: With a maximum clock frequency of 100 MHz, it enables rapid data switching.

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient data routing in time-critical applications.
• Low power consumption makes it suitable for battery-powered devices.
• Wide operating voltage range provides flexibility in various electronic systems.
• Compatibility with TTL and CMOS logic levels ensures easy integration with existing circuits.

Disadvantages

• Limited number of inputs and outputs may restrict its use in complex systems requiring more extensive data routing capabilities.
• Propagation delay time of 5 ns (typical) may introduce slight delays in data transmission.

Working Principles

The 74ACT157SJX operates based on the principles of digital multiplexing. The control inputs determine which of the four input lines is selected and routed to the output line. The selected input signal appears at the output, while the non-selected inputs are disconnected.

Application Field Plans

The 74ACT157SJX finds application in various fields, including: 1. Digital communication systems 2. Data acquisition systems 3. Industrial automation 4. Consumer electronics 5. Automotive electronics

Alternative Models

Alternative models that offer similar functionality to the 74ACT157SJX include: - 74HC157: A CMOS logic version with a wider operating voltage range. - CD4051: An analog multiplexer/demultiplexer IC with higher input/output count.

In conclusion, the 74ACT157SJX is a versatile multiplexer IC that offers high-speed operation, low power consumption, and compatibility with TTL and CMOS logic levels. Its compact package and wide operating voltage range make it suitable for various applications in digital electronic systems.