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SN74HC645NSR
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SN74HC645NSR

Product Overview

  • Category: Integrated Circuit
  • Use: Level Shifter and Bus Transceiver
  • Characteristics: High-Speed, Non-Inverting, 3-State Outputs
  • Package: SOIC (Small Outline Integrated Circuit)
  • Essence: This product is a level shifter and bus transceiver integrated circuit that provides non-inverting, high-speed, and 3-state outputs.
  • Packaging/Quantity: Available in reels with 2500 units per reel.

Specifications

  • Supply Voltage Range: 2V to 6V
  • Input Voltage Range: 0V to VCC
  • Output Voltage Range: 0V to VCC
  • Maximum Operating Frequency: 80 MHz
  • Number of Channels: 8
  • Logic Family: HC
  • Logic Type: CMOS
  • RoHS Compliant: Yes

Detailed Pin Configuration

The SN74HC645NSR has a total of 20 pins. The pin configuration is as follows:

  1. OE (Output Enable) - Output Enable Control Input
  2. A1 - Channel A Data Input/Output
  3. B1 - Channel B Data Input/Output
  4. A2 - Channel A Data Input/Output
  5. B2 - Channel B Data Input/Output
  6. A3 - Channel A Data Input/Output
  7. B3 - Channel B Data Input/Output
  8. A4 - Channel A Data Input/Output
  9. B4 - Channel B Data Input/Output
  10. GND (Ground) - Ground Reference
  11. B5 - Channel B Data Input/Output
  12. A5 - Channel A Data Input/Output
  13. B6 - Channel B Data Input/Output
  14. A6 - Channel A Data Input/Output
  15. B7 - Channel B Data Input/Output
  16. A7 - Channel A Data Input/Output
  17. B8 - Channel B Data Input/Output
  18. A8 - Channel A Data Input/Output
  19. VCC - Positive Power Supply
  20. DIR (Direction) - Direction Control Input

Functional Features

  • Non-Inverting: The SN74HC645NSR provides non-inverting functionality, ensuring that the output signal matches the input signal.
  • High-Speed: This integrated circuit operates at high speeds, allowing for efficient data transmission and processing.
  • 3-State Outputs: The 3-state outputs enable the device to be disconnected from the bus, providing flexibility in multi-device communication.

Advantages and Disadvantages

Advantages: - Non-inverting functionality ensures accurate signal transmission. - High-speed operation allows for efficient data processing. - 3-state outputs provide flexibility in multi-device communication.

Disadvantages: - Limited supply voltage range (2V to 6V). - Maximum operating frequency of 80 MHz may not meet the requirements of some high-speed applications.

Working Principles

The SN74HC645NSR functions as a level shifter and bus transceiver. It translates signals between different voltage levels, allowing communication between devices with incompatible voltage levels. The device uses CMOS technology to achieve high-speed operation and non-inverting functionality. The direction control input (DIR) determines the direction of data flow, while the output enable input (OE) controls the output state.

Detailed Application Field Plans

The SN74HC645NSR is commonly used in various applications, including:

  1. Microcontroller Interfacing: It facilitates communication between microcontrollers operating at different voltage levels.
  2. Bus Transceivers: It enables bidirectional data transfer between buses with different voltage levels.
  3. Level Shifting: It converts logic levels between different voltage domains, allowing compatibility between different systems.

Detailed and Complete Alternative Models

  1. SN74HC646NSR: Similar to SN74HC645NSR, but with inverted outputs.
  2. SN74HCT645NSR: A variant that operates at a wider supply voltage range of 4.5V to 5.5V.
  3. SN74LVC245AN: A low-voltage CMOS alternative with a supply voltage range of 1.65V to 3.6V.

These alternative models offer similar functionality and can be considered based on specific application requirements.

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기술 솔루션에 SN74HC645NSR 적용과 관련된 10가지 일반적인 질문과 답변을 나열하세요.

Sure! Here are 10 common questions and answers related to the application of SN74HC645NSR in technical solutions:

  1. Q: What is SN74HC645NSR? A: SN74HC645NSR is a high-speed octal bus transceiver with 3-state outputs, commonly used for bidirectional data transfer between different voltage levels.

  2. Q: What is the operating voltage range of SN74HC645NSR? A: The operating voltage range of SN74HC645NSR is typically between 2V and 6V.

  3. Q: Can SN74HC645NSR be used for level shifting between different voltage domains? A: Yes, SN74HC645NSR can be used as a level shifter to enable communication between devices operating at different voltage levels.

  4. Q: How many bidirectional channels does SN74HC645NSR have? A: SN74HC645NSR has 8 bidirectional channels, allowing for simultaneous data transfer in both directions.

  5. Q: What is the maximum data transfer rate supported by SN74HC645NSR? A: SN74HC645NSR supports high-speed data transfer rates up to 80 Mbps.

  6. Q: Can SN74HC645NSR handle multiple voltage levels simultaneously? A: Yes, SN74HC645NSR can handle multiple voltage levels simultaneously, making it suitable for mixed-voltage systems.

  7. Q: Does SN74HC645NSR have built-in protection features? A: Yes, SN74HC645NSR has built-in ESD protection, which helps safeguard against electrostatic discharge events.

  8. Q: Can SN74HC645NSR be used in both digital and analog applications? A: SN74HC645NSR is primarily designed for digital applications, but it can also be used in certain analog scenarios.

  9. Q: What is the power supply voltage required for SN74HC645NSR? A: SN74HC645NSR typically requires a power supply voltage of 2V to 6V.

  10. Q: Are there any specific application notes or reference designs available for SN74HC645NSR? A: Yes, Texas Instruments provides application notes and reference designs that can help guide the implementation of SN74HC645NSR in various technical solutions.

Please note that these answers are general and may vary depending on the specific requirements and use cases. It's always recommended to refer to the datasheet and documentation provided by the manufacturer for accurate information.