Encyclopedia Entry: 74AC245SC

Product Overview

Category

The 74AC245SC belongs to the category of integrated circuits (ICs) and specifically falls under the family of digital logic devices.

Use

This IC is commonly used for signal level shifting and bus transceiver applications in digital systems. It facilitates bidirectional data transfer between two buses with different voltage levels.

Characteristics

• Voltage Compatibility: The 74AC245SC is compatible with both TTL and CMOS voltage levels.
• High-Speed Operation: It operates at high speeds, making it suitable for time-critical applications.
• Bidirectional Data Transfer: This IC enables data transmission in both directions.
• Output Enable Control: It features an output enable pin that allows the user to control the direction of data flow.

Package

The 74AC245SC is available in a standard 20-pin small outline integrated circuit (SOIC) package. This package offers compactness and ease of integration into various electronic systems.

Essence

The essence of the 74AC245SC lies in its ability to provide efficient and reliable bidirectional data transfer between buses operating at different voltage levels.

Packaging/Quantity

The 74AC245SC is typically packaged in reels or tubes, containing multiple units per package. The exact quantity may vary depending on the manufacturer's specifications.

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Maximum Operating Frequency: 125 MHz
• Propagation Delay: 5 ns (typical)
• Input/Output Capacitance: 4 pF (typical)

Detailed Pin Configuration

The 74AC245SC has a total of 20 pins, each serving a specific function. Here is the detailed pin configuration:

1. OE (Output Enable)
2. A1 (Data Bus A, Bit 1)
3. A2 (Data Bus A, Bit 2)
4. A3 (Data Bus A, Bit 3)
5. A4 (Data Bus A, Bit 4)
6. A5 (Data Bus A, Bit 5)
7. A6 (Data Bus A, Bit 6)
8. GND (Ground)
9. B1 (Data Bus B, Bit 1)
10. B2 (Data Bus B, Bit 2)
11. B3 (Data Bus B, Bit 3)
12. B4 (Data Bus B, Bit 4)
13. B5 (Data Bus B, Bit 5)
14. B6 (Data Bus B, Bit 6)
15. VCC (Supply Voltage)
16. DIR (Direction Control)
17. B7 (Data Bus B, Bit 7)
18. B8 (Data Bus B, Bit 8)
19. B9 (Data Bus B, Bit 9)
20. B10 (Data Bus B, Bit 10)

Functional Features

The 74AC245SC offers the following functional features:

• Bidirectional Data Transfer: It allows data to be transmitted in both directions between two buses.
• Output Enable Control: The output enable pin enables or disables the data transfer.
• Direction Control: The direction control pin determines the direction of data flow.

Advantages and Disadvantages

Advantages

• Compatibility: Works with both TTL and CMOS voltage levels.
• High-Speed Operation: Suitable for time-critical applications.
• Bidirectional Data Transfer: Enables efficient communication between different voltage level buses.

Disadvantages

• Limited Voltage Range: Operates within a specific voltage range (2V to 6V).
• Propagation Delay: Has a small propagation delay, which may affect timing-sensitive applications.

Working Principles

The 74AC245SC operates based on the principles of digital logic. It utilizes transistors and other electronic components to facilitate bidirectional data transfer between two buses. The output enable and direction control pins allow the user to control the flow of data.

Detailed Application Field Plans

The 74AC245SC finds applications in various fields, including:

1. Microcontroller Interfacing: It can be used to interface microcontrollers with different voltage level peripherals.
2. Communication Systems: Enables data transmission between devices operating at different voltage levels.
3. Industrial Automation: Facilitates communication between different modules in industrial automation systems.
4. Embedded Systems: Used for signal level shifting in embedded systems with multiple voltage domains.

Detailed and Complete Alternative Models

There are several alternative models available that serve similar purposes to the 74AC245SC. Some notable alternatives include:

• 74HC245: A CMOS-based octal bus transceiver with similar functionality.
• SN74LV245A: A low-voltage octal bus transceiver suitable for battery-powered applications.