SN74LS85N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Arithmetic Logic Unit (ALU)
• Characteristics:
  • High-speed operation
  • Low power consumption
  • Wide operating voltage range
  • TTL compatible inputs and outputs
• Package: DIP (Dual In-line Package)
• Essence: 4-bit magnitude comparator
• Packaging/Quantity: Available in tubes of 25 pieces or reels of 2000 pieces

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: 0°C to 70°C
• Input Voltage High (VIH): 2.0V (min)
• Input Voltage Low (VIL): 0.8V (max)
• Output Voltage High (VOH): 2.7V (min)
• Output Voltage Low (VOL): 0.5V (max)

Detailed Pin Configuration

The SN74LS85N has a total of 16 pins, numbered as follows:

1. A3
2. B3
3. A2
4. B2
5. A1
6. B1
7. A0
8. B0
9. GND (Ground)
10. LT (Less Than)
11. EQ (Equal)
12. GT (Greater Than)
13. VCC (Supply Voltage)
14. B3'
15. B2'
16. B1'

Functional Features

The SN74LS85N is a 4-bit magnitude comparator that compares two 4-bit binary numbers and determines their relationship (less than, equal, or greater than). It provides three output signals: LT (Less Than), EQ (Equal), and GT (Greater Than), indicating the result of the comparison.

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient processing of binary numbers - Low power consumption helps in reducing energy usage - Wide operating voltage range ensures compatibility with various systems - TTL compatible inputs and outputs facilitate easy integration into existing circuits

Disadvantages: - Limited to comparing 4-bit binary numbers - Requires external circuitry for cascading multiple comparators

Working Principles

The SN74LS85N compares the two 4-bit binary numbers by examining each corresponding pair of bits. It performs a series of logical operations to determine the relationship between the numbers. The output signals LT, EQ, and GT are generated based on the comparison results.

Detailed Application Field Plans

The SN74LS85N is commonly used in applications that require binary number comparison, such as:

1. Digital calculators
2. Microcontrollers
3. Data sorting and searching algorithms
4. Control systems
5. Error detection and correction circuits

Detailed and Complete Alternative Models

Some alternative models to the SN74LS85N include:

1. SN74LS85D: Similar specifications but available in SOIC (Small Outline Integrated Circuit) package.
2. CD74HC85E: 4-bit magnitude comparator with similar characteristics but operates at higher speeds.
3. MC14585B: Another 4-bit magnitude comparator with comparable features but operates at lower power levels.

These alternative models can be considered based on specific project requirements and availability.

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