Encyclopedia Entry: 74VHC244SJ

Product Overview

Category

The 74VHC244SJ belongs to the category of integrated circuits (ICs), specifically a type of digital logic gate.

Use

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

Characteristics

• Voltage Compatibility: The 74VHC244SJ operates at a voltage range of 2.0V to 5.5V, making it suitable for various applications.
• High-Speed Operation: It offers high-speed performance with propagation delays as low as 4.3 ns.
• Output Drive Capability: This IC can drive up to 10 LSTTL loads, making it ideal for driving bus lines.
• 3-State Outputs: The 74VHC244SJ features 3-state outputs, allowing multiple devices to share a common bus without interference.

Package and Quantity

The 74VHC244SJ is available in a small outline package (SOP) with 20 pins. It is typically sold in reels or tubes, with quantities varying depending on the supplier.

Specifications

• Supply Voltage Range: 2.0V to 5.5V
• Input Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Maximum Propagation Delay: 4.3 ns
• Output Current: ±6 mA
• Input Capacitance: 3 pF
• Output Capacitance: 8 pF

Pin Configuration

The 74VHC244SJ has a total of 20 pins, which are assigned specific functions as follows:

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

Functional Features

• Non-Inverting Buffer: The 74VHC244SJ provides non-inverting buffer functionality, ensuring that the output signal matches the input signal.
• High-Speed Operation: With low propagation delays, this IC enables fast signal transmission and processing.
• 3-State Outputs: The 3-state outputs allow for easy control of bus sharing between multiple devices without interference.

Advantages and Disadvantages

Advantages

• Wide voltage compatibility range allows for versatile use in various electronic applications.
• High-speed operation ensures efficient signal processing.
• 3-state outputs enable effective bus sharing among multiple devices.

Disadvantages

• Limited output current capability may restrict its use in certain high-current applications.
• The small outline package (SOP) may require careful handling during installation to prevent damage.

Working Principles

The 74VHC244SJ operates based on the principles of digital logic gates. It receives input signals and amplifies them while maintaining their integrity. The non-inverting buffer design ensures that the output signal matches the input signal, providing a reliable and accurate representation of the input.

Application Field Plans

The 74VHC244SJ finds applications in various electronic systems, including: - Microcontrollers and microprocessors - Data communication devices - Industrial automation systems - Automotive electronics - Consumer electronics

Alternative Models

For those seeking alternatives to the 74VHC244SJ, several similar ICs are available on the market. These include: - SN74LVC244A: Low-voltage octal buffer/line driver with 3-state outputs. - CD74HCT244: High-speed CMOS logic octal buffer/line driver. - MC74VHC244: Octal buffer/line driver with 3-state outputs.

These alternative models offer comparable functionality and can be considered based on specific project requirements.

In conclusion, the 74VHC244SJ is a versatile integrated circuit used for signal amplification, buffering, and level shifting. Its high-speed operation, wide voltage compatibility, and 3-state outputs make it suitable for various electronic applications. While it has limitations in terms of output current and package size, alternative models provide viable options for different project needs.