Encyclopedia Entry: 74ACT139PC

Product Overview

Category

The 74ACT139PC 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 electronic systems for data selection, routing, and decoding purposes. It allows for efficient control and manipulation of multiple input signals.

Characteristics

• High-speed operation: The 74ACT139PC operates at a high clock frequency, making it suitable for time-critical applications.
• Low power consumption: This IC is designed to minimize power consumption, 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 74ACT139PC is compatible with various logic families, including TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor).

Package and Quantity

The 74ACT139PC is available in a standard dual in-line package (DIP), which consists of 16 pins. It is commonly sold in packs of 25 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 (typical)
• Maximum Operating Frequency: 100 MHz

Pin Configuration

The 74ACT139PC has 16 pins arranged as follows:

┌───┬───┐ A1 --|1 16|-- Vcc A0 --|2 15|-- Y0 E --|3 14|-- Y1 /Y0 --|4 13|-- Y2 /Y1 --|5 12|-- Y3 /Y2 --|6 11|-- GND /Y3 --|7 10|-- B0 G1 --|8 9|-- B1 └───┴───┘

Functional Features

The 74ACT139PC is a dual 2-to-4 line decoder/demultiplexer. It has two enable inputs (E and G1) and two address inputs (A0 and A1). The outputs (Y0 to Y3) are determined based on the combination of the address inputs.

Advantages

• High-speed operation allows for efficient data manipulation in time-critical applications.
• Low power consumption ensures energy efficiency in electronic systems.
• Wide operating voltage range provides flexibility in various voltage environments.
• Compatibility with different logic families enables easy integration into existing systems.

Disadvantages

• Limited number of output lines (4) may restrict its use in applications requiring more output options.
• Propagation delay time may introduce timing issues in certain high-frequency applications.

Working Principles

When the enable input (E) is active, the 74ACT139PC decodes the binary address inputs (A0 and A1) and activates the corresponding output line (Y0 to Y3). The demultiplexer function is achieved when the enable input (G1) is inactive, allowing the outputs to remain in a high-impedance state.

Application Field Plans

The 74ACT139PC finds applications in various digital systems, including: 1. Address decoding in microprocessors and microcontrollers. 2. Data routing and selection in multiplexing applications. 3. Memory addressing and control circuits. 4. Programmable logic devices (PLDs) and field-programmable gate arrays (FPGAs).

Alternative Models

There are several alternative models available in the market that offer similar functionality to the 74ACT139PC. Some notable alternatives include: - 74HC139: A CMOS version of the decoder/demultiplexer with a wider supply voltage range. - CD74AC139: Another high-speed decoder/demultiplexer with additional output lines.

In conclusion, the 74ACT139PC is a versatile integrated circuit used for data selection and decoding purposes in digital electronic systems. Its high-speed operation, low power consumption, and compatibility make it a popular choice among designers and engineers in various applications.

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