Encyclopedia Entry: 74ACT138SC

Product Overview

Category

The 74ACT138SC belongs to the category of integrated circuits (ICs) and specifically falls under the family of digital multiplexers/demultiplexers.

Use

This product is commonly used in digital electronics for signal routing and selection purposes. It acts as a 3-to-8 line decoder/demultiplexer, allowing the user to select one of eight output lines based on a three-bit binary input.

Characteristics

• High-speed operation: The 74ACT138SC operates at high speeds, making it suitable for applications requiring quick response times.
• Low power consumption: This IC is designed to consume minimal power, ensuring energy efficiency in electronic systems.
• Wide operating voltage range: It can operate within a wide voltage range, typically between 2V and 6V.
• Compatibility: The 74ACT138SC is compatible with both TTL and CMOS logic levels, making it versatile for various digital circuit designs.

Package and Quantity

The 74ACT138SC is available in a standard 16-pin small outline integrated circuit (SOIC) package. It is commonly sold in reels or tubes containing multiple units, with quantities varying depending on the supplier.

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
• Maximum Propagation Delay: 10 ns
• Maximum Quiescent Current: 4 mA

Pin Configuration

┌───┐ A0 --|1 16|-- VCC A1 --|2 15|-- Y0 A2 --|3 14|-- Y1 GND --|4 13|-- Y2 E1 --|5 12|-- Y3 E2 --|6 11|-- Y4 Y7 --|7 10|-- Y5 Y6 --|8 9 |-- Y6 └───┘

Functional Features

The 74ACT138SC is designed to perform the following functions: - Decoding: It decodes a three-bit binary input (A0, A1, A2) and selects one of the eight output lines (Y0-Y7) based on the input combination. - Demultiplexing: It can also function as a demultiplexer, taking a single input and routing it to one of the eight output lines based on the input's binary representation.

Advantages and Disadvantages

Advantages

• High-speed operation enables quick signal routing and selection.
• Low power consumption contributes to energy-efficient designs.
• Wide operating voltage range allows for compatibility with various systems.
• Versatility in accepting both TTL and CMOS logic levels simplifies integration into different circuit designs.

Disadvantages

• Limited to 3-to-8 line decoding/demultiplexing functionality.
• May require additional components for more complex applications.

Working Principles

The 74ACT138SC operates based on the principles of digital logic. The three input pins (A0, A1, A2) accept a three-bit binary code, which determines the selected output line. The internal circuitry decodes this input and activates the corresponding output line (Y0-Y7). The enable pins (E1, E2) control the operation of the decoder/demultiplexer, allowing the user to enable or disable the device as needed.

Application Field Plans

The 74ACT138SC finds application in various fields, including but not limited to: - Digital communication systems - Data routing and selection in microcontrollers - Address decoding in memory systems - Programmable logic devices - Industrial automation and control systems

Alternative Models

Several alternative models with similar functionality to the 74ACT138SC are available in the market. Some notable alternatives include: - 74HC138: A CMOS version of the decoder/demultiplexer. - 74LS138: A TTL version of the decoder/demultiplexer. - CD74HCT138: A high-speed CMOS version with TTL-compatible inputs.

These alternatives offer similar features and can be used as substitutes depending on specific design requirements.

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