Encyclopedia Entry: 74AC280SJ

Product Overview

Category

The 74AC280SJ belongs to the category of integrated circuits (ICs) and specifically falls under the family of digital logic devices.

Use

This IC is primarily used for arithmetic functions in digital systems, particularly for binary addition and subtraction operations.

Characteristics

• The 74AC280SJ is a 9-bit magnitude comparator.
• It operates on a supply voltage range of 2V to 6V.
• This IC offers high-speed operation and low power consumption.
• It is designed to be compatible with both TTL and CMOS logic families.

Package

The 74AC280SJ is available in a small outline integrated circuit (SOIC) package. This package type provides ease of handling and efficient use of board space.

Essence

The essence of the 74AC280SJ lies in its ability to compare two 9-bit binary numbers and determine their relative magnitudes.

Packaging/Quantity

The 74AC280SJ is typically packaged in reels or tubes, containing a quantity of 250 units per reel/tube.

Specifications

• Supply Voltage Range: 2V to 6V
• Logic Family Compatibility: TTL and CMOS
• Number of Bits: 9
• Operating Temperature Range: -40°C to +85°C
• Input/Output Type: Single-Ended
• Package Type: SOIC

Detailed Pin Configuration

The 74AC280SJ has a total of 20 pins, each serving a specific function. The pin configuration is as follows:

1. A0: Input A, Bit 0
2. A1: Input A, Bit 1
3. A2: Input A, Bit 2
4. A3: Input A, Bit 3
5. A4: Input A, Bit 4
6. A5: Input A, Bit 5
7. A6: Input A, Bit 6
8. A7: Input A, Bit 7
9. A8: Input A, Bit 8
10. B0: Input B, Bit 0
11. B1: Input B, Bit 1
12. B2: Input B, Bit 2
13. B3: Input B, Bit 3
14. B4: Input B, Bit 4
15. B5: Input B, Bit 5
16. B6: Input B, Bit 6
17. B7: Input B, Bit 7
18. B8: Input B, Bit 8
19. GND: Ground
20. VCC: Supply Voltage

Functional Features

The 74AC280SJ offers the following functional features:

• Magnitude Comparison: It compares two 9-bit binary numbers and determines their relative magnitudes.
• Output Indication: The IC provides outputs indicating whether the numbers are equal, or if one is greater than the other.

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient arithmetic calculations.
• Low power consumption contributes to energy efficiency in digital systems.
• Compatibility with both TTL and CMOS logic families enables versatile integration into various circuit designs.

Disadvantages

• Limited to 9-bit magnitude comparison, not suitable for larger bit sizes.
• Requires external circuitry for carry/borrow propagation in multi-bit addition/subtraction operations.

Working Principles

The 74AC280SJ utilizes a combination of internal logic gates to compare the corresponding bits of two 9-bit binary numbers. By analyzing the input signals, the IC determines the relative magnitudes and generates appropriate output signals accordingly.

Detailed Application Field Plans

The 74AC280SJ finds applications in various digital systems, including but not limited to:

1. Microprocessors and microcontrollers
2. Arithmetic logic units (ALUs)
3. Digital signal processing (DSP) circuits
4. Data communication systems
5. Industrial automation and control systems

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the 74AC280SJ include:

1. 74HC280: This IC operates on a wider supply voltage range of 2V to 6V and is compatible with the CMOS logic family.
2. 74LS85: It is a 4-bit magnitude comparator, suitable for smaller binary numbers.
3. CD4585: This IC offers 4-bit magnitude comparison and features compatibility with both TTL and CMOS logic families.

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

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