MM74HC688N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Binary Magnitude Comparator
• Characteristics: High-Speed, CMOS Logic, 8-bit Parallel Comparators
• Package: DIP (Dual In-line Package)
• Essence: The MM74HC688N is a versatile IC that performs binary magnitude comparison of two 8-bit numbers. It is commonly used in digital systems where numerical comparisons are required.
• Packaging/Quantity: The MM74HC688N is available in a standard DIP package and is typically sold in quantities of 25 or more.

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage: 0V to Vcc
• Operating Temperature: -40°C to +85°C
• Propagation Delay: 9ns (typical)
• Output Current: ±25mA
• Logic Family: HC (High-Speed CMOS)

Pin Configuration

The MM74HC688N has a total of 20 pins, which are assigned specific functions 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. 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. GND: Ground (0V)
18. LT: Less Than Output
19. EQ: Equal Output
20. GT: Greater Than Output

Functional Features

The MM74HC688N offers the following functional features:

• Binary Magnitude Comparison: It compares two 8-bit numbers and provides outputs indicating whether the first number is less than, equal to, or greater than the second number.
• High-Speed Operation: The HC logic family ensures fast operation with a typical propagation delay of 9ns.
• CMOS Technology: The IC utilizes CMOS technology, which provides low power consumption and high noise immunity.
• Parallel Comparators: The MM74HC688N performs parallel comparison of all corresponding bits of the input numbers simultaneously.

Advantages and Disadvantages

Advantages: - Fast operation due to the HC logic family - Low power consumption - High noise immunity - Simultaneous comparison of all bits

Disadvantages: - Limited to 8-bit comparisons - Requires external pull-up resistors for proper operation

Working Principles

The MM74HC688N works by comparing each bit of the two 8-bit input numbers in parallel. It determines the relationship between the corresponding bits and generates three output signals: LT (Less Than), EQ (Equal), and GT (Greater Than). These outputs indicate the result of the magnitude comparison.

The IC utilizes CMOS technology, which allows for low power consumption and high noise immunity. It operates within a wide supply voltage range of 2V to 6V and can withstand temperatures ranging from -40°C to +85°C.

Detailed Application Field Plans

The MM74HC688N finds applications in various digital systems where binary magnitude comparison is required. Some of the common application fields include:

1. Arithmetic Logic Units (ALUs)
2. Microprocessors and Microcontrollers
3. Digital Signal Processing (DSP) Systems
4. Data Sorting and Searching Algorithms
5. Error Detection and Correction Circuits

Detailed and Complete Alternative Models

• SN74HC688N: Similar to MM74HC688N, but manufactured by Texas Instruments.
• CD74HC688E: Another alternative from Texas Instruments with similar functionality.

These alternative models offer similar features and can be used as replacements for the MM74HC688N in various applications.

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