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74AHC245D,118
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74AHC245D,118

Product Overview

  • Category: Integrated Circuit
  • Use: Level Shifter/Transceiver
  • Characteristics: High-speed, low-power, bidirectional voltage level translation
  • Package: SOIC (Small Outline Integrated Circuit)
  • Essence: Transfers digital signals between different voltage domains
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Supply Voltage Range: 2.0V to 5.5V
  • Input Voltage Range: -0.5V to VCC + 0.5V
  • Output Voltage Range: -0.5V to VCC + 0.5V
  • High-Level Input Voltage: 0.7 x VCC to VCC + 0.5V
  • Low-Level Input Voltage: -0.5V to 0.3 x VCC
  • High-Level Output Voltage: VCC - 0.5V
  • Low-Level Output Voltage: 0.5V

Pin Configuration

The 74AHC245D,118 has a total of 20 pins, which are arranged as follows:

  1. DIR (Direction Control)
  2. OE (Output Enable)
  3. A1 (Input/Output Port A)
  4. A2 (Input/Output Port A)
  5. A3 (Input/Output Port A)
  6. A4 (Input/Output Port A)
  7. A5 (Input/Output Port A)
  8. GND (Ground)
  9. B5 (Input/Output Port B)
  10. B4 (Input/Output Port B)
  11. B3 (Input/Output Port B)
  12. B2 (Input/Output Port B)
  13. B1 (Input/Output Port B)
  14. VCC (Supply Voltage)
  15. B0 (Input/Output Port B)
  16. A0 (Input/Output Port A)
  17. VREFB (Reference Voltage for Port B)
  18. VREFA (Reference Voltage for Port A)
  19. NC (No Connection)
  20. GND (Ground)

Functional Features

  • Bidirectional voltage level translation between two independent voltage domains
  • High-speed operation, suitable for applications requiring fast data transfer
  • Low power consumption, making it energy-efficient
  • 8-bit wide input/output ports for each voltage domain
  • Direction control pin allows selection of data flow direction
  • Output enable pin enables/disables the outputs

Advantages and Disadvantages

Advantages: - Efficient voltage level shifting between different voltage domains - High-speed operation for quick data transfer - Low power consumption for energy efficiency

Disadvantages: - Limited number of input/output ports (8-bit wide)

Working Principles

The 74AHC245D,118 is a bidirectional level shifter/transceiver that allows for the translation of digital signals between two voltage domains. It operates by using a combination of CMOS technology and Schottky diodes to achieve high-speed and low-power performance.

The device has two independent 8-bit wide input/output ports, labeled Port A and Port B. The direction of data flow can be controlled using the DIR pin. When DIR is set to logic high, data flows from Port A to Port B, and when DIR is set to logic low, data flows from Port B to Port A.

The OE pin is used to enable or disable the outputs. When OE is set to logic high, the outputs are enabled, allowing data to be transferred between the two voltage domains. When OE is set to logic low, the outputs are disabled, effectively isolating the two voltage domains.

Detailed Application Field Plans

The 74AHC245D,118 is commonly used in various applications that require voltage level translation between different voltage domains. Some of the typical application fields include:

  1. Microcontroller interfacing: The device can be used to interface microcontrollers operating at different voltage levels, allowing them to communicate with each other.
  2. Communication systems: It can be employed in communication systems to enable data transfer between devices operating at different voltage levels, such as UART, SPI, or I2C interfaces.
  3. Logic level conversion: The level shifter/transceiver can be utilized to convert logic levels between different families of integrated circuits, ensuring compatibility and seamless operation.
  4. Sensor interfaces: It can be used to interface sensors with microcontrollers or other devices operating at different voltage levels, enabling data acquisition and processing.

Detailed and Complete Alternative Models

  • 74LVC245A: Low-voltage CMOS Octal Bus Transceiver with 5V Tolerant Inputs/Outputs
  • SN74LVCH245A: Octal Bus Transceiver with 3-State Outputs
  • CD74HCT245: High-Speed CMOS Logic Octal Bus Transceiver

These alternative models offer similar functionality and

技術ソリューションにおける 74AHC245D,118 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 74AHC245D,118 in technical solutions:

  1. Q: What is the function of the 74AHC245D,118? A: The 74AHC245D,118 is an octal bus transceiver that facilitates bidirectional level shifting between two voltage domains.

  2. Q: What is the operating voltage range of the 74AHC245D,118? A: The 74AHC245D,118 operates within a voltage range of 2 V to 5.5 V.

  3. Q: Can the 74AHC245D,118 be used for level shifting between different logic families? A: Yes, the 74AHC245D,118 can be used for level shifting between different logic families, such as TTL and CMOS.

  4. Q: What is the maximum data transfer rate supported by the 74AHC245D,118? A: The 74AHC245D,118 supports a maximum data transfer rate of 400 Mbps.

  5. Q: How many bidirectional channels does the 74AHC245D,118 have? A: The 74AHC245D,118 has 8 bidirectional channels.

  6. Q: Can the 74AHC245D,118 be used for voltage translation in I2C communication? A: Yes, the 74AHC245D,118 can be used for voltage translation in I2C communication between devices operating at different voltage levels.

  7. Q: Does the 74AHC245D,118 have any built-in protection features? A: Yes, the 74AHC245D,118 has built-in diode clamps to protect against electrostatic discharge (ESD) and overvoltage.

  8. Q: What is the typical propagation delay of the 74AHC245D,118? A: The typical propagation delay of the 74AHC245D,118 is around 6 ns.

  9. Q: Can the 74AHC245D,118 be used for level shifting between analog signals? A: No, the 74AHC245D,118 is designed for digital signals and may not provide accurate level shifting for analog signals.

  10. Q: Are there any specific layout considerations when using the 74AHC245D,118? A: Yes, it is recommended to minimize trace lengths, provide proper decoupling capacitors, and follow the manufacturer's guidelines for optimal performance.

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