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CD74AC245E
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CD74AC245E

Product Overview

  • Category: Integrated Circuit
  • Use: Level Shifting and Bus Transceiver
  • Characteristics: High-Speed, Low-Power, Bidirectional
  • Package: 20-pin DIP (Dual In-line Package)
  • Essence: Transfers data between different voltage levels in digital systems
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Supply Voltage: 2V to 6V
  • Input Voltage Levels: 0V to VCC
  • Output Voltage Levels: 0V to VCC
  • Operating Temperature Range: -40°C to +85°C
  • Propagation Delay: 5.8 ns (typical)
  • Output Drive Capability: ±24 mA

Pin Configuration

The CD74AC245E has a total of 20 pins, which are labeled as follows:

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

Functional Features

  • Bidirectional data transfer between two voltage domains
  • High-speed operation suitable for fast digital systems
  • Low-power consumption for energy-efficient designs
  • Output enable control for flexible data flow management
  • ESD (Electrostatic Discharge) protection for improved reliability

Advantages and Disadvantages

Advantages

  • Allows interfacing between different voltage levels in digital systems
  • Supports bidirectional data transfer, reducing the need for additional components
  • High-speed operation enables efficient data transmission
  • Low-power consumption helps conserve energy
  • ESD protection enhances the reliability of the circuit

Disadvantages

  • Limited to a maximum supply voltage of 6V
  • Propagation delay may affect timing-sensitive applications
  • Requires careful consideration of input and output voltage levels

Working Principles

The CD74AC245E is a level shifting and bus transceiver integrated circuit. It facilitates the transfer of data between digital systems operating at different voltage levels. The device features bidirectional data lines, allowing data to flow in both directions. The output enable pins control the direction of data flow.

When the output enable pin is active, data can be transmitted from the A-side to the B-side or vice versa. When the output enable pin is inactive, the data lines are in a high-impedance state, isolating the A-side and B-side.

The CD74AC245E operates by translating the logic levels of the input signals to the corresponding logic levels of the output signals. It ensures that the voltage levels are compatible between the two connected systems, enabling seamless communication.

Detailed Application Field Plans

The CD74AC245E is widely used in various applications where level shifting and bus transceiver functions are required. Some common application areas include:

  1. Microcontroller interfacing with different voltage peripherals
  2. Communication systems involving multiple voltage domains
  3. Data acquisition systems with mixed signal levels
  4. Industrial automation and control systems
  5. Automotive electronics for signal translation between subsystems

Detailed and Complete Alternative Models

  • SN74LVC245A: Low-Voltage CMOS Octal Bus Transceiver
  • MC74VHC245: High-Speed CMOS Octal Bus Transceiver
  • 74HCT245: High-Speed CMOS Octal Bus Transceiver with 3-State Outputs
  • CD74ACT245: Advanced CMOS Octal Bus Transceiver

These alternative models offer similar functionality to the CD74AC245E and can be considered as alternatives based on specific design requirements.

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Liste 10 perguntas e respostas comuns relacionadas à aplicação de CD74AC245E em soluções técnicas

Sure! Here are 10 common questions and answers related to the application of CD74AC245E in technical solutions:

  1. Q: What is CD74AC245E? A: CD74AC245E is a type of octal bus transceiver integrated circuit (IC) that can be used for bidirectional data transfer between different voltage levels.

  2. Q: What is the operating voltage range of CD74AC245E? A: CD74AC245E operates within a voltage range of 2V to 6V.

  3. Q: Can CD74AC245E handle both TTL and CMOS logic levels? A: Yes, CD74AC245E is compatible with both TTL and CMOS logic levels.

  4. Q: How many data lines can CD74AC245E handle? A: CD74AC245E can handle 8 data lines, making it suitable for applications requiring parallel data transfer.

  5. Q: Is CD74AC245E capable of level shifting? A: Yes, CD74AC245E can perform level shifting, allowing data transfer between systems operating at different voltage levels.

  6. Q: What is the maximum data transfer rate supported by CD74AC245E? A: CD74AC245E supports high-speed data transfer rates up to 125 MHz.

  7. Q: Can CD74AC245E be used for bi-directional communication? A: Yes, CD74AC245E is designed for bi-directional data transfer, enabling communication between two devices.

  8. Q: Does CD74AC245E have any built-in protection features? A: Yes, CD74AC245E includes built-in diode clamps for protection against electrostatic discharge (ESD).

  9. Q: What is the typical power consumption of CD74AC245E? A: The typical power consumption of CD74AC245E is low, making it suitable for battery-powered applications.

  10. Q: What are some common applications of CD74AC245E? A: CD74AC245E is commonly used in various technical solutions such as data communication systems, memory interfacing, bus buffering, and level shifting between different voltage domains.

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