Encyclopedia Entry: 74ACT240

Product Overview

Category

The 74ACT240 is a digital integrated circuit (IC) belonging to the category of octal buffer/line drivers.

Use

This IC is primarily used for signal buffering and line driving applications in digital systems.

Characteristics

• The 74ACT240 operates on a supply voltage range of 4.5V to 5.5V.
• It offers high-speed performance with a maximum propagation delay of 8 ns.
• This IC features eight non-inverting buffers with three-state outputs.
• It is compatible with both TTL and CMOS logic levels.
• The 74ACT240 has a wide operating temperature range, making it suitable for various environments.

Package

The 74ACT240 is available in a standard 20-pin dual in-line package (DIP).

Essence

The essence of the 74ACT240 lies in its ability to provide efficient buffering and line driving capabilities, ensuring reliable signal transmission within digital systems.

Packaging/Quantity

The 74ACT240 is typically sold in reels or tubes, containing multiple units per package. The exact quantity may vary depending on the supplier.

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Logic Family: ACT
• Number of Buffers: 8
• Output Type: Non-Inverting
• Maximum Propagation Delay: 8 ns
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The 74ACT240 IC has a total of 20 pins, each serving a specific function. Here is the detailed pin configuration:

1. GND (Ground)
2. A1 (Input A1)
3. Y1 (Output Y1)
4. A2 (Input A2)
5. Y2 (Output Y2)
6. A3 (Input A3)
7. Y3 (Output Y3)
8. A4 (Input A4)
9. Y4 (Output Y4)
10. GND (Ground)
11. A5 (Input A5)
12. Y5 (Output Y5)
13. A6 (Input A6)
14. Y6 (Output Y6)
15. A7 (Input A7)
16. Y7 (Output Y7)
17. A8 (Input A8)
18. Y8 (Output Y8)
19. VCC (Positive Power Supply)
20. GND (Ground)

Functional Features

The 74ACT240 offers the following functional features:

• Buffering: It provides buffering capabilities to ensure signal integrity and prevent signal degradation during transmission.
• Line Driving: The IC can drive signals across long distances without significant loss or distortion.
• Three-State Outputs: The three-state outputs allow for easy control of bus lines, enabling multiple devices to share a common data bus.

Advantages and Disadvantages

Advantages

• High-speed performance enables efficient data transmission.
• Compatibility with both TTL and CMOS logic levels allows for versatile integration into various digital systems.
• Wide operating temperature range ensures reliability in different environments.
• Three-state outputs facilitate bus sharing and system flexibility.

Disadvantages

• Limited voltage supply range restricts its use in certain applications requiring higher or lower voltages.
• Non-inverting outputs may not be suitable for all system configurations.

Working Principles

The 74ACT240 operates based on standard digital buffer principles. It receives input signals on the A1-A8 pins and amplifies them to provide corresponding output signals on the Y1-Y8 pins. The non-inverting nature of the outputs ensures that the amplified signals maintain the same logic level as the inputs. The three-state outputs allow the IC to be effectively controlled, enabling bus sharing and preventing conflicts between multiple devices connected to the same data bus.

Detailed Application Field Plans

The 74ACT240 finds applications in various digital systems where signal buffering and line driving are essential. Some common application fields include:

1. Microprocessors: The IC can be used to buffer address and data lines between a microprocessor and memory devices.
2. Communication Systems: It is suitable for line driving in communication interfaces, such as UART (Universal Asynchronous Receiver-Transmitter) or RS-232.
3. Industrial Automation: The IC can be employed in control systems to drive signals across long distances without loss or distortion.
4. Automotive Electronics: It finds use in automotive applications, such as engine control units (ECUs), where reliable signal transmission is crucial.

Detailed and Complete Alternative Models

There are several alternative models available that offer similar functionality to the 74ACT240. Some notable alternatives include:

1. 74HC240: This IC operates on a wider voltage range of 2V to 6V and is compatible with CMOS logic levels.
2. 74LS240: It operates on