Texas Instruments
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CD74HC85M
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CD74HC85M

Product Overview

Category

CD74HC85M belongs to the category of integrated circuits (ICs).

Use

It is commonly used in digital systems for arithmetic operations, specifically for binary magnitude comparators.

Characteristics

  • High-speed operation
  • Wide operating voltage range
  • Low power consumption
  • Compatibility with TTL (Transistor-Transistor Logic) inputs
  • Schmitt trigger action on all inputs

Package

CD74HC85M is available in a 16-pin SOIC (Small Outline Integrated Circuit) package.

Essence

The essence of CD74HC85M lies in its ability to compare two binary numbers and provide outputs indicating their relationship (greater than, less than, or equal).

Packaging/Quantity

CD74HC85M is typically packaged in reels containing 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 Time: 9 ns (typical)
  • Maximum Quiescent Current: 4 μA

Detailed Pin Configuration

  1. A3 (Input)
  2. A2 (Input)
  3. A1 (Input)
  4. A0 (Input)
  5. B3 (Input)
  6. B2 (Input)
  7. B1 (Input)
  8. B0 (Input)
  9. GND (Ground)
  10. LT (Output: Less Than)
  11. EQ (Output: Equal)
  12. GT (Output: Greater Than)
  13. VCC (Supply Voltage)
  14. NC (No Connection)
  15. NC (No Connection)
  16. NC (No Connection)

Functional Features

  • Four pairs of binary inputs (A3-A0 and B3-B0) for comparison
  • Three output pins (LT, EQ, GT) indicating the relationship between the two inputs
  • Schmitt trigger action ensures noise immunity and hysteresis

Advantages and Disadvantages

Advantages

  • High-speed operation enables efficient arithmetic operations
  • Wide operating voltage range allows compatibility with various systems
  • Low power consumption reduces energy requirements
  • TTL compatibility simplifies integration into existing digital circuits
  • Schmitt trigger action enhances noise immunity

Disadvantages

  • Limited number of input pairs restricts simultaneous comparisons
  • Propagation delay time may affect real-time applications

Working Principles

CD74HC85M compares the binary values applied to its input pins (A3-A0 and B3-B0). It internally performs a magnitude comparison and generates outputs on LT, EQ, and GT pins based on the relationship between the two inputs. The Schmitt trigger action ensures stable and accurate comparisons even in the presence of noise.

Detailed Application Field Plans

CD74HC85M finds applications in various digital systems where binary magnitude comparison is required. Some specific application fields include: - Arithmetic units in microprocessors - Digital signal processing circuits - Data sorting and searching algorithms - Error detection and correction mechanisms

Detailed and Complete Alternative Models

  1. SN74HC85: Similar functionality and characteristics, available in DIP (Dual Inline Package) format.
  2. CD54HC85: Higher speed operation, but limited operating voltage range.
  3. MC74HC85: Lower power consumption, but slightly slower propagation delay time.

These alternative models offer similar functionalities to CD74HC85M while providing certain variations in terms of package type, speed, operating voltage range, and power consumption.

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Énumérez 10 questions et réponses courantes liées à l'application de CD74HC85M dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of CD74HC85M in technical solutions:

  1. Q: What is CD74HC85M? A: CD74HC85M is a high-speed CMOS (Complementary Metal-Oxide-Semiconductor) 4-bit magnitude comparator integrated circuit.

  2. Q: What are the key features of CD74HC85M? A: CD74HC85M features 4-bit parallel inputs, 3-bit outputs, and operates at high speeds with low power consumption.

  3. Q: How can CD74HC85M be used in technical solutions? A: CD74HC85M can be used for comparing two 4-bit binary numbers and determining their relationship (greater than, less than, or equal).

  4. Q: What is the maximum operating voltage for CD74HC85M? A: The maximum operating voltage for CD74HC85M is typically 6 volts.

  5. Q: Can CD74HC85M handle both positive and negative logic inputs? A: No, CD74HC85M is designed to work with positive logic inputs only.

  6. Q: What is the output format of CD74HC85M? A: CD74HC85M provides three outputs: A<B, A=B, and A>B, indicating the relationship between the two input numbers.

  7. Q: What is the typical propagation delay of CD74HC85M? A: The typical propagation delay of CD74HC85M is around 15 nanoseconds.

  8. Q: Can CD74HC85M be cascaded to compare larger bit numbers? A: Yes, multiple CD74HC85M ICs can be cascaded together to compare larger bit numbers.

  9. Q: What is the power supply voltage range for CD74HC85M? A: The power supply voltage range for CD74HC85M is typically between 2 volts and 6 volts.

  10. Q: Are there any specific precautions to consider when using CD74HC85M? A: It is important to avoid exceeding the maximum ratings, provide proper decoupling capacitors, and follow recommended operating conditions mentioned in the datasheet.

Please note that these answers are general and may vary depending on the specific application and requirements.