CD74HCT688E

Product Overview

• Category: Integrated Circuit (IC)
• Use: Arithmetic Logic Unit (ALU) in digital systems
• Characteristics: High-speed operation, low power consumption
• Package: 20-pin DIP (Dual In-line Package)
• Essence: 8-bit magnitude comparator with parallel and serial outputs
• Packaging/Quantity: Available in tubes of 25 units or reels of 2,000 units

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -55°C to +125°C
• Propagation Delay Time: 15ns (typical)
• Power Dissipation: 500mW (max)

Detailed Pin Configuration

1. A0: Input A0
2. A1: Input A1
3. A2: Input A2
4. A3: Input A3
5. A4: Input A4
6. A5: Input A5
7. A6: Input A6
8. A7: Input A7
9. B0: Input B0
10. B1: Input B1
11. B2: Input B2
12. B3: Input B3
13. B4: Input B4
14. B5: Input B5
15. B6: Input B6
16. B7: Input B7
17. GND: Ground
18. P/S: Parallel/Serial select input
19. S0: Serial data input
20. VCC: Supply voltage

Functional Features

• Performs 8-bit magnitude comparison between two inputs (A and B)
• Provides parallel and serial outputs for comparison results
• Supports both parallel and serial modes of operation
• Parallel mode allows simultaneous comparison of all bits
• Serial mode enables cascading multiple devices for larger word sizes

Advantages

• High-speed operation allows for efficient processing in digital systems
• Low power consumption helps reduce overall energy requirements
• Versatile parallel and serial modes offer flexibility in system design
• Compact 20-pin DIP package facilitates easy integration into circuits

Disadvantages

• Limited to 8-bit magnitude comparison, may not be suitable for larger word sizes
• Requires additional devices for cascading to achieve larger word sizes
• Operating temperature range may restrict usage in extreme environments

Working Principles

The CD74HCT688E is an 8-bit magnitude comparator that compares two inputs (A and B) and determines their relative magnitudes. It operates by comparing each corresponding bit of the inputs and generating output signals based on the comparison results. The device can operate in either parallel or serial mode, selected by the P/S input.

In parallel mode, all bits are compared simultaneously, and the comparison results are available at the parallel outputs. In serial mode, the device can be cascaded with other comparators to compare larger word sizes. The S0 input provides the serial data input for this mode.

Detailed Application Field Plans

The CD74HCT688E finds applications in various digital systems where magnitude comparison is required. Some common application fields include:

1. Microcontrollers: Used in arithmetic operations and decision-making algorithms.
2. Digital Signal Processing: Comparing signal amplitudes for filtering or modulation.
3. Data Processing Units: Sorting and ranking data based on magnitude.
4. Communication Systems: Comparing signal strengths or frequencies for channel selection.
5. Industrial Control Systems: Monitoring and controlling processes based on magnitude comparisons.

Detailed and Complete Alternative Models

1. SN74LS688: Similar 8-bit magnitude comparator with parallel and serial outputs.
2. CD74HC688: High-speed CMOS version of the 8-bit magnitude comparator.
3. 74F688: Fast TTL version of the 8-bit magnitude comparator.

These alternative models offer similar functionality and can be used as replacements for the CD74HCT688E in various applications.

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