SN74LS85DR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Arithmetic Logic Unit (ALU)
• Characteristics: 4-bit magnitude comparator
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Performs comparison operations on two 4-bit binary numbers
• Packaging/Quantity: Tape and reel, 2500 units per reel

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: -40°C to +85°C
• Input Voltage High: 2V (min), 7V (max)
• Input Voltage Low: -0.5V (min), 0.8V (max)
• Output Voltage High: 2.7V (min), VCC (max)
• Output Voltage Low: 0V (min), 0.5V (max)

Detailed Pin Configuration

1. A3 (Input)
2. B3 (Input)
3. A2 (Input)
4. B2 (Input)
5. A1 (Input)
6. B1 (Input)
7. A0 (Input)
8. B0 (Input)
9. LT (Output)
10. EQ (Output)
11. GT (Output)
12. GND (Ground)
13. B3 (Input)
14. B2 (Input)
15. B1 (Input)
16. B0 (Input)
17. A3 (Input)
18. A2 (Input)
19. A1 (Input)
20. A0 (Input)
21. VCC (Supply Voltage)

Functional Features

• Compares two 4-bit binary numbers and determines their relationship (less than, equal, or greater than)
• Outputs three signals indicating the result of the comparison: LT (Less Than), EQ (Equal), and GT (Greater Than)
• Performs comparison in a single clock cycle
• Supports cascading for larger bit-width comparisons

Advantages

• Compact and integrated design saves board space
• Fast operation with minimal delay
• Low power consumption
• Easy to use and interface with other components

Disadvantages

• Limited to 4-bit comparisons, not suitable for larger bit-width operations
• Requires external clock signal for synchronous operation

Working Principles

The SN74LS85DR is an arithmetic logic unit that compares two 4-bit binary numbers. It utilizes a combination of logic gates and flip-flops to perform the comparison operation. The inputs A3-A0 and B3-B0 represent the bits of the two numbers to be compared. The internal circuitry compares each corresponding pair of bits and generates the LT, EQ, and GT signals based on the result.

Detailed Application Field Plans

• Digital calculators
• Microcontrollers
• Data processing systems
• Control units in electronic devices
• Binary arithmetic operations

Detailed and Complete Alternative Models

1. SN74LS85N: DIP (Dual In-line Package) version of SN74LS85DR
2. SN74HC85: High-speed CMOS version with similar functionality
3. CD74HC85E: CMOS version with extended temperature range

Note: This list is not exhaustive and there may be other alternative models available in the market.

This entry provides an overview of the SN74LS85DR, a 4-bit magnitude comparator IC. It includes information about its category, use, characteristics, package, and packaging/quantity. The specifications, pin configuration, functional features, advantages, and disadvantages are also discussed. Additionally, the working principles, application field plans, and alternative models are provided.