Encyclopedia Entry: 74ALVC245WM

Product Overview

Category

The 74ALVC245WM belongs to the category of integrated circuits (ICs) and specifically falls under the group of digital logic devices.

Use

This IC is commonly used for level shifting and voltage translation applications in digital systems. It enables bidirectional data transfer between two buses operating at different voltage levels.

Characteristics

• Voltage Level Shifting: The 74ALVC245WM allows for seamless communication between devices operating at different voltage levels, ensuring compatibility.
• Bidirectional Data Transfer: It facilitates data transmission in both directions, making it suitable for applications requiring simultaneous read and write operations.
• High-Speed Operation: This IC operates at high speeds, enabling efficient data transfer in time-critical applications.
• Low Power Consumption: The 74ALVC245WM is designed to consume minimal power, making it energy-efficient.

Package and Quantity

The 74ALVC245WM is available in a small-outline integrated circuit (SOIC) package. It is typically supplied in reels or tubes, with a standard quantity of 250 units per package.

Specifications

• Supply Voltage Range: 1.2V to 3.6V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 400 MHz
• Number of Channels: 8
• Input/Output Type: Tri-State
• Logic Family: ALVC

Pin Configuration

The 74ALVC245WM features a 20-pin configuration, as follows:

+-------------------+ OE -|1 20|- VCC A1 -|2 19|- B1 A2 -|3 18|- B2 A3 -|4 17|- B3 A4 -|5 74ALVC245WM 16|- B4 A5 -|6 15|- B5 A6 -|7 14|- B6 A7 -|8 13|- B7 A8 -|9 12|- B8 GND -|10 11|- DIR +-------------------+

Functional Features

• Bidirectional Data Transfer: The IC allows data to be transmitted bidirectionally between two buses, controlled by the DIR pin.
• Tri-State Outputs: The outputs can be put into a high-impedance state using the OE (Output Enable) pin, facilitating bus sharing and preventing contention.
• Voltage Level Shifting: It supports voltage translation between different logic families, ensuring seamless communication.

Advantages and Disadvantages

Advantages

• Efficient Voltage Translation: Enables communication between devices operating at different voltage levels.
• High-Speed Operation: Facilitates fast data transfer in time-critical applications.
• Low Power Consumption: Designed to minimize power consumption, making it energy-efficient.

Disadvantages

• Limited Channel Count: The IC provides 8 channels, which may not be sufficient for applications requiring a higher number of data lines.
• Sensitivity to Noise: As with any digital logic device, the 74ALVC245WM is susceptible to noise interference, which may affect its performance.

Working Principles

The 74ALVC245WM operates based on the principles of voltage level shifting and tri-state logic. When the DIR pin is set to a specific logic level, data can flow bidirectionally between the A and B buses. The OE pin enables or disables the outputs, allowing for bus sharing and preventing conflicts.

Application Field Plans

The 74ALVC245WM finds extensive use in various digital systems, including but not limited to: - Microcontrollers and microprocessors - Communication systems - Data acquisition systems - Industrial automation - Consumer electronics

Alternative Models

For applications requiring similar functionality, the following alternative models can be considered: - 74LVC245A: This IC offers similar features but operates at a lower voltage range (1.65V to 5.5V). - SN74LVCH245A: A comparable IC from Texas Instruments, providing bidirectional voltage level shifting capabilities.

In conclusion, the 74ALVC245WM is a versatile integrated circuit used for voltage level shifting and bidirectional data transfer. Its high-speed operation, low power consumption, and compatibility make it suitable for various digital systems across different industries.

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