Encyclopedia Entry: 74VHC240M

Product Overview

Category

The 74VHC240M belongs to the category of integrated circuits (ICs) and specifically falls under the family of VHC series logic gates.

Use

This IC is primarily used for signal amplification, buffering, and level shifting in digital electronic circuits. It serves as a non-inverting octal buffer/line driver with 3-state outputs.

Characteristics

• High-speed operation: The 74VHC240M offers fast switching speeds, making it suitable for applications requiring quick response times.
• Wide voltage range: It operates within a wide voltage range, typically between 2.0V and 5.5V, allowing compatibility with various digital systems.
• Low power consumption: This IC consumes minimal power, making it energy-efficient and suitable for battery-powered devices.
• 3-state outputs: The 74VHC240M features 3-state outputs, enabling multiple devices to share a common bus without interference.

Package and Quantity

The 74VHC240M is available in a small outline integrated circuit (SOIC) package. It consists of 20 pins and is surface-mountable. It is commonly sold in reels or tubes containing multiple units.

Specifications

• Supply Voltage Range: 2.0V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 125 MHz
• Propagation Delay Time: 4 ns (max)
• Output Current: ±8 mA

Pin Configuration

The 74VHC240M has a total of 20 pins, which are assigned specific functions. The pin configuration is as follows:

1. A1
2. Y1
3. A2
4. Y2
5. A3
6. Y3
7. A4
8. Y4
9. GND (Ground)
10. Y5
11. A5
12. Y6
13. A6
14. Y7
15. A7
16. Y8
17. OE (Output Enable)
18. VCC (Supply Voltage)
19. B1
20. B2

Functional Features

• Non-inverting buffer: The 74VHC240M amplifies and buffers digital signals without changing their logic levels.
• 3-state outputs: The IC allows the outputs to be in a high-impedance state, enabling multiple devices to share the same bus.
• High-speed operation: It provides fast switching speeds, ensuring efficient signal transmission in time-critical applications.

Advantages and Disadvantages

Advantages

• Wide voltage range compatibility
• Low power consumption
• High-speed operation
• 3-state output capability

Disadvantages

• Limited number of inputs and outputs
• Not suitable for high-power applications

Working Principles

The 74VHC240M operates based on CMOS (Complementary Metal-Oxide-Semiconductor) technology. It utilizes MOSFET transistors to amplify and buffer digital signals. When the output enable (OE) pin is active, the input signals are amplified and transmitted to the corresponding outputs. When the OE pin is inactive, the outputs enter a high-impedance state, allowing other devices to drive the bus.

Application Field Plans

The 74VHC240M finds applications in various digital electronic systems, including but not limited to: - Microcontrollers and microprocessors - Data communication systems - Memory interfaces - Industrial automation - Automotive electronics

Alternative Models

Several alternative models with similar functionality to the 74VHC240M include: - 74HC240: Standard CMOS octal buffer/line driver - 74LS240: Low-power Schottky TTL octal buffer/line driver - SN74LV240A: Low-voltage CMOS octal buffer/line driver

These alternative models can be considered based on specific project requirements and availability.

In conclusion, the 74VHC240M is a versatile IC that offers high-speed operation, low power consumption, and 3-state output capability. Its wide voltage range compatibility makes it suitable for various digital applications. However, it has limitations in terms of input/output count and power handling capacity. Understanding its specifications, pin configuration, functional features, and application field plans can aid in utilizing this IC effectively within electronic circuits.