CD74HC688M96

Product Overview

• Category: Integrated Circuit
• Use: Digital Comparator
• Characteristics: High-Speed, CMOS Logic, 8-Bit Magnitude Comparator
• Package: SOIC-20
• Essence: The CD74HC688M96 is a high-speed CMOS logic integrated circuit that performs 8-bit magnitude comparison. It is commonly used in digital systems to compare two binary numbers and determine their relative magnitudes.
• Packaging/Quantity: The CD74HC688M96 is available in a SOIC-20 package and is typically sold in reels of 2500 units.

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 9 ns (typical)
• Input Capacitance: 3.5 pF (typical)
• Output Current: ±25 mA

Pin Configuration

The CD74HC688M96 has a total of 20 pins arranged as follows:

___________ | | 1 |1 20| VCC 2 |2 19| A0 3 |3 18| B0 4 |4 17| A1 5 |5 16| B1 6 |6 15| A2 7 |7 14| B2 8 |8 13| A3 9 |9 12| B3 10 |10 11| B4 |___________|

Functional Features

• Performs 8-bit magnitude comparison.
• Outputs three signals: A>B, A<B, and A=B.
• High-speed operation with a propagation delay of 9 ns.
• CMOS logic ensures low power consumption.
• Wide operating voltage range (2V to 6V).
• Can be cascaded for larger word size comparisons.

Advantages and Disadvantages

Advantages: - High-speed operation allows for quick comparison of binary numbers. - Low power consumption due to CMOS technology. - Wide operating voltage range provides flexibility in various applications. - Cascadable design enables larger word size comparisons.

Disadvantages: - Limited to 8-bit magnitude comparison, not suitable for larger word sizes. - Requires external circuitry for handling carry/borrow operations in multi-bit comparisons.

Working Principles

The CD74HC688M96 compares two 8-bit binary numbers by examining each bit from the most significant bit (MSB) to the least significant bit (LSB). It determines the relative magnitudes of the two numbers and generates three output signals: A>B, A<B, and A=B. These signals indicate whether the first number is greater than, less than, or equal to the second number, respectively.

The comparator operates using CMOS logic, which ensures high-speed operation and low power consumption. It can be powered by a supply voltage ranging from 2V to 6V, making it compatible with a wide range of digital systems.

Detailed Application Field Plans

The CD74HC688M96 is commonly used in various digital systems that require magnitude comparison. Some specific application fields include:

1. Arithmetic Logic Units (ALUs)
2. Microcontrollers
3. Digital Signal Processors (DSPs)
4. Data processing units
5. Communication systems

In these applications, the CD74HC688M96 enables efficient comparison of binary numbers, allowing for decision-making and control based on their relative magnitudes.

Detailed and Complete Alternative Models

1. SN74HC688: Similar to CD74HC688M96, but available in a DIP-20 package.
2. 74HCT688: TTL-compatible version with similar functionality.
3. CD54HC688: High-speed CMOS version with improved performance.

These alternative models offer similar functionality to the CD74HC688M96 and can be used as replacements depending on specific requirements and availability.

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