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SN74HCT645N

SN74HCT645N

Product Overview

Category

SN74HCT645N belongs to the category of integrated circuits (ICs).

Use

It is commonly used as a bidirectional octal bus transceiver.

Characteristics

  • High-speed CMOS technology
  • 8-bit wide bidirectional bus interface
  • Voltage-level translation between 5V and 3.3V systems
  • Non-inverting outputs for easy cascading
  • Schmitt-trigger inputs for noise immunity

Package

SN74HCT645N is available in a 20-pin DIP (Dual Inline Package) format.

Essence

The essence of SN74HCT645N lies in its ability to facilitate bidirectional communication between two buses with different voltage levels.

Packaging/Quantity

SN74HCT645N is typically packaged in tubes or reels, with quantities varying based on customer requirements.

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: 12 ns (max)
  • Output Current: ±6 mA

Detailed Pin Configuration

  1. A1: Bus A, Bit 1
  2. A2: Bus A, Bit 2
  3. A3: Bus A, Bit 3
  4. A4: Bus A, Bit 4
  5. A5: Bus A, Bit 5
  6. A6: Bus A, Bit 6
  7. A7: Bus A, Bit 7
  8. A8: Bus A, Bit 8
  9. GND: Ground
  10. B8: Bus B, Bit 8
  11. B7: Bus B, Bit 7
  12. B6: Bus B, Bit 6
  13. B5: Bus B, Bit 5
  14. B4: Bus B, Bit 4
  15. B3: Bus B, Bit 3
  16. B2: Bus B, Bit 2
  17. B1: Bus B, Bit 1
  18. OE: Output Enable
  19. DIR: Direction Control
  20. VCC: Supply Voltage

Functional Features

  • Bidirectional data transfer between two buses
  • Voltage-level translation for compatibility between different systems
  • Non-inverting outputs allow easy cascading of multiple devices
  • Schmitt-trigger inputs provide noise immunity and signal conditioning

Advantages and Disadvantages

Advantages

  • High-speed operation
  • Wide voltage range support
  • Noise-immune inputs
  • Easy cascading capability

Disadvantages

  • Limited output current capacity
  • Requires external control signals for direction and enable

Working Principles

SN74HCT645N operates by receiving data from one bus (A) and transmitting it to another bus (B), or vice versa. The direction of data flow is controlled by the DIR pin. When DIR is high, data flows from A to B, and when DIR is low, data flows from B to A. The OE pin enables or disables the outputs.

Detailed Application Field Plans

SN74HCT645N finds applications in various fields, including: 1. Microcontroller interfacing 2. Data communication systems 3. Industrial automation 4. Embedded systems 5. Networking equipment

Detailed and Complete Alternative Models

Some alternative models that serve similar functions to SN74HCT645N are: 1. 74HC245 2. CD74HCT245E 3. MC74HCT245AN 4. SN74HCT245N 5. 74HCT245D

These models offer comparable features and can be used as substitutes based on specific requirements.

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技術ソリューションにおける SN74HCT645N の適用に関連する 10 件の一般的な質問と回答をリストします。

Sure! Here are 10 common questions and answers related to the application of SN74HCT645N in technical solutions:

  1. Q: What is SN74HCT645N? A: SN74HCT645N is a type of integrated circuit (IC) commonly used as a bidirectional transceiver for converting signals between different voltage levels.

  2. Q: What is the voltage range supported by SN74HCT645N? A: SN74HCT645N supports a voltage range of 4.5V to 5.5V.

  3. Q: Can SN74HCT645N be used for level shifting between different logic families? A: Yes, SN74HCT645N is specifically designed for level shifting between TTL and CMOS logic families.

  4. Q: How many bidirectional channels does SN74HCT645N have? A: SN74HCT645N has 8 bidirectional channels, allowing for simultaneous data transmission in both directions.

  5. Q: What is the maximum data transfer rate supported by SN74HCT645N? A: SN74HCT645N can support data transfer rates up to 25 MHz.

  6. Q: Can SN74HCT645N be used for bus isolation? A: Yes, SN74HCT645N can be used for bus isolation as it provides bidirectional buffering and voltage level conversion.

  7. Q: Does SN74HCT645N have any built-in protection features? A: Yes, SN74HCT645N has built-in ESD protection diodes that help protect against electrostatic discharge.

  8. Q: Can SN74HCT645N be used in both parallel and serial communication systems? A: Yes, SN74HCT645N can be used in both parallel and serial communication systems, depending on the application requirements.

  9. Q: What is the power supply voltage required for SN74HCT645N? A: SN74HCT645N requires a power supply voltage of 4.5V to 5.5V.

  10. Q: Are there any specific precautions to consider when using SN74HCT645N? A: It is important to ensure that the input and output voltage levels are within the specified range to prevent damage to the IC. Additionally, proper decoupling capacitors should be used to stabilize the power supply.