74HCT688N,652

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Arithmetic Logic Unit (ALU) comparator
• Characteristics: High-speed operation, low power consumption, wide operating voltage range
• Package: DIP-20 (Dual In-line Package with 20 pins)
• Essence: A high-performance 8-bit magnitude comparator
• Packaging/Quantity: Tape and Reel, 2,500 units per reel

Specifications

• Supply Voltage Range: 2.0V to 6.0V
• Input Voltage Range: -0.5V to VCC + 0.5V
• Operating Temperature Range: -40°C to +125°C
• Propagation Delay: 11 ns (typical)
• Output Current: ±4 mA
• Logic Family: HCT (High-Speed CMOS)

Detailed Pin Configuration

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. B0: Input B, bit 0
10. B1: Input B, bit 1
11. B2: Input B, bit 2
12. B3: Input B, bit 3
13. B4: Input B, bit 4
14. B5: Input B, bit 5
15. B6: Input B, bit 6
16. B7: Input B, bit 7
17. LT: Less Than output
18. EQ: Equal output
19. GT: Greater Than output
20. GND: Ground

Functional Features

• Performs 8-bit magnitude comparison between two inputs (A and B)
• Outputs three signals indicating the relationship between A and B: LT (Less Than), EQ (Equal), and GT (Greater Than)
• High-speed operation allows for efficient processing of large data sets
• Low power consumption makes it suitable for battery-powered devices
• Wide operating voltage range ensures compatibility with various systems

Advantages and Disadvantages

Advantages

• High-speed operation enables quick comparison of large data sets
• Low power consumption prolongs battery life in portable devices
• Wide operating voltage range provides flexibility in system integration

Disadvantages

• Limited to 8-bit magnitude comparison, not suitable for larger data sizes
• DIP-20 package may require additional space compared to smaller surface-mount packages

Working Principles

The 74HCT688N,652 is an 8-bit magnitude comparator that compares two 8-bit binary numbers (A and B). It determines whether A is less than, equal to, or greater than B. The internal circuitry consists of multiple logic gates and flip-flops that perform the necessary comparisons and generate the appropriate output signals.

Detailed Application Field Plans

• Digital signal processing systems
• Microcontrollers and microprocessors
• Arithmetic and logical operations in computers
• Data sorting and searching algorithms
• Industrial automation and control systems

Detailed and Complete Alternative Models

• 74LS688: Similar 8-bit magnitude comparator with TTL logic family
• SN74HC688: 8-bit magnitude comparator with CMOS logic family
• CD74HCT688: High-speed 8-bit magnitude comparator with Schottky-clamped TTL logic

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