Encyclopedia Entry: 74AC280SJX

Product Overview

Category

The 74AC280SJX belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronics for arithmetic and logic operations.

Characteristics

• The 74AC280SJX is a high-speed, 9-bit magnitude comparator.
• It operates on a wide voltage range, typically between 2V and 6V.
• This IC offers low power consumption and high noise immunity.
• It is designed to be compatible with both TTL and CMOS logic families.

Package

The 74AC280SJX is available in a small outline integrated circuit (SOIC) package.

Essence

The essence of the 74AC280SJX lies in its ability to compare two 9-bit binary numbers and determine their relative magnitudes.

Packaging/Quantity

This IC is typically sold in reels or tubes, with each reel containing a specific quantity of units. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to Vcc
• Operating Temperature Range: -40°C to +85°C
• Output Current: ±24mA
• Propagation Delay: 5ns (typical)
• Power Dissipation: 500mW (max)

Detailed Pin Configuration

The 74AC280SJX has a total of 20 pins, which are assigned specific functions as follows:

1. A0: Input pin for the least significant bit (LSB) of the first 9-bit number.
2. A1: Input pin for the second LSB of the first 9-bit number.
3. A2: Input pin for the third LSB of the first 9-bit number.
4. A3: Input pin for the fourth LSB of the first 9-bit number.
5. A4: Input pin for the fifth LSB of the first 9-bit number.
6. A5: Input pin for the sixth LSB of the first 9-bit number.
7. A6: Input pin for the seventh LSB of the first 9-bit number.
8. A7: Input pin for the eighth LSB of the first 9-bit number.
9. A8: Input pin for the most significant bit (MSB) of the first 9-bit number.
10. B0: Input pin for the LSB of the second 9-bit number.
11. B1: Input pin for the second LSB of the second 9-bit number.
12. B2: Input pin for the third LSB of the second 9-bit number.
13. B3: Input pin for the fourth LSB of the second 9-bit number.
14. B4: Input pin for the fifth LSB of the second 9-bit number.
15. B5: Input pin for the sixth LSB of the second 9-bit number.
16. B6: Input pin for the seventh LSB of the second 9-bit number.
17. B7: Input pin for the eighth LSB of the second 9-bit number.
18. B8: Input pin for the MSB of the second 9-bit number.
19. GND: Ground pin.
20. Vcc: Power supply pin.

Functional Features

The 74AC280SJX offers the following functional features:

• Magnitude Comparison: It compares two 9-bit binary numbers and determines their relative magnitudes.
• Output Indication: The IC provides three output signals (A<B, A=B, A>B) indicating the result of the comparison.
• Fast Operation: With a typical propagation delay of 5ns, it enables high-speed arithmetic and logic operations.

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient processing of arithmetic and logic operations.
• Wide voltage range compatibility makes it suitable for various digital electronic applications.
• Low power consumption contributes to energy efficiency.
• High noise immunity ensures reliable performance in noisy environments.

Disadvantages

• Limited to 9-bit magnitude comparison, may not be suitable for applications requiring larger bit sizes.
• Availability and pricing may vary depending on the supplier and market demand.

Working Principles

The 74AC280SJX works based on a combination of digital logic gates and flip-flops. It compares the corresponding bits of two 9-bit binary numbers and generates output signals indicating whether the first number is less than, equal to, or greater than the second number. The internal circuitry utilizes a combination of AND, OR, and XOR gates along with D-type flip-flops to perform the comparison and generate the desired outputs.

Detailed Application Field Plans

The 74AC280SJX finds application in various fields where magnitude comparison of 9-bit binary numbers is required. Some specific application areas include:

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