Encyclopedia Entry: 74VHC245FT

Product Overview

Category

The 74VHC245FT is a digital integrated circuit (IC) belonging to the category of voltage level shifters.

Use

This IC is primarily used for level shifting applications in digital systems. It allows for bidirectional voltage translation between two different voltage domains, making it useful in interfacing circuits operating at different logic levels.

Characteristics

• Voltage Level Shifter
• Bidirectional Translation
• High-Speed Operation
• Low Power Consumption

Package

The 74VHC245FT is available in a small form factor package known as TSSOP-20 (Thin Shrink Small Outline Package). This package offers excellent thermal performance and ease of integration into various electronic designs.

Essence

The essence of the 74VHC245FT lies in its ability to facilitate seamless communication between digital circuits operating at different voltage levels, ensuring compatibility and reliable data transfer.

Packaging/Quantity

The 74VHC245FT is typically packaged in reels or tubes, containing a specified quantity of ICs per package. The exact packaging and quantity may vary depending on the manufacturer's specifications.

Specifications

• Supply Voltage Range: 2.0V to 5.5V
• Logic Voltage Levels: Compatible with both TTL and CMOS levels
• Maximum Data Rate: Up to 200 MHz
• Number of Channels: 8
• Input/Output Capacitance: 3.5 pF (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The 74VHC245FT features a total of 20 pins, each serving a specific function. The pin configuration is as follows:

1. OE (Output Enable) 1
2. A1 (Input/Output) 1
3. I/O1 (Bidirectional) 1
4. GND (Ground)
5. I/O2 (Bidirectional) 2
6. A2 (Input/Output) 2
7. OE (Output Enable) 2
8. VCC (Supply Voltage)
9. B1 (Input/Output) 1
10. I/O3 (Bidirectional) 3
11. B2 (Input/Output) 2
12. I/O4 (Bidirectional) 4
13. I/O5 (Bidirectional) 5
14. B3 (Input/Output) 3
15. I/O6 (Bidirectional) 6
16. B4 (Input/Output) 4
17. I/O7 (Bidirectional) 7
18. A3 (Input/Output) 3
19. OE (Output Enable) 3
20. I/O8 (Bidirectional) 8

Functional Features

• Bidirectional voltage level shifting between two voltage domains.
• High-speed operation allows for efficient data transfer.
• Output enable pins provide control over the direction of data flow.
• Wide supply voltage range ensures compatibility with various systems.
• Low power consumption makes it suitable for battery-powered devices.

Advantages and Disadvantages

Advantages

• Enables seamless communication between circuits operating at different voltage levels.
• Supports bidirectional data transfer, enhancing versatility.
• High-speed operation facilitates efficient data transmission.
• Wide supply voltage range ensures compatibility with a variety of systems.
• Compact package offers ease of integration into electronic designs.

Disadvantages

• May require additional external components for certain applications.
• Limited number of channels (8) may not be sufficient for complex systems requiring more connections.

Working Principles

The 74VHC245FT operates based on the principles of voltage level shifting. It utilizes a combination of MOSFETs and logic gates to translate digital signals between two voltage domains. The direction of data flow is controlled by the output enable pins, allowing bidirectional communication.

Detailed Application Field Plans

The 74VHC245FT finds applications in various fields where voltage level shifting is required. Some common application areas include:

1. Microcontroller Interfacing: Facilitating communication between microcontrollers operating at different logic levels.
2. Sensor Interfaces: Enabling connection between sensors and microcontrollers with varying voltage requirements.
3. Communication Systems: Level shifting between different communication protocols or standards.
4. Display Panels: Interfacing display panels with different voltage requirements.
5. Industrial Automation: Voltage translation in industrial control systems.

Detailed and Complete Alternative Models

1. SN74LVC245A: Similar bidirectional voltage level shifter with 8 channels.
2. CD4504B: Hex non-inverting level shifter IC suitable for voltage translation applications.
3. TXS0108E: 8-channel bidirectional voltage level translator with automatic direction sensing.

These alternative models offer similar functionality and can be considered as alternatives to the 74VHC