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CD74HC640E
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CD74HC640E

Product Overview

  • Category: Integrated Circuit
  • Use: Logic Level Shifter
  • Characteristics: High-Speed, Octal Bus Transceiver
  • Package: 20-pin DIP (Dual In-line Package)
  • Essence: The CD74HC640E is a logic level shifter integrated circuit that provides an octal bus transceiver functionality. It allows bidirectional voltage level translation between different logic levels, making it suitable for interfacing between devices operating at different voltage levels.
  • Packaging/Quantity: Available in tubes of 25 units or reels of 2,000 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: 9 ns (typical)
  • Output Drive Capability: ±24 mA
  • Input Capacitance: 3.5 pF (typical)
  • Output Capacitance: 6 pF (typical)

Pin Configuration

The CD74HC640E has a total of 20 pins, which are assigned specific functions 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. GND (Ground)
  9. B4 (Data Input/Output) 4
  10. A4 (Data Input/Output) 4
  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. VCC (Positive Power Supply)
  18. B8 (Data Input/Output) 8
  19. A8 (Data Input/Output) 8
  20. OE (Output Enable) 2

Functional Features

  • Bidirectional voltage level translation between different logic levels.
  • High-speed operation with a propagation delay of only 9 ns.
  • Octal bus transceiver functionality for efficient data transfer.
  • Output drive capability of ±24 mA allows driving of capacitive loads.
  • Output enable pins for easy control of data flow.

Advantages and Disadvantages

Advantages

  • Enables seamless interfacing between devices operating at different voltage levels.
  • High-speed operation ensures efficient data transfer.
  • Compact 20-pin DIP package for easy integration into various circuit designs.
  • Wide supply voltage range allows compatibility with different power sources.

Disadvantages

  • Limited to octal bus transceiver functionality, may not be suitable for applications requiring higher channel counts.
  • Requires careful consideration of input and output voltage levels to prevent signal distortion or damage.

Working Principles

The CD74HC640E operates based on the principles of voltage level shifting using CMOS technology. It utilizes a combination of MOSFETs and transistors to achieve bidirectional voltage translation between different logic levels. The input signals are detected and amplified, allowing them to be properly translated to the desired output voltage level. The output enable pins provide control over the direction of data flow, enabling efficient communication between devices.

Detailed Application Field Plans

The CD74HC640E is commonly used in various applications that require voltage level translation, such as:

  1. Interfacing between microcontrollers operating at different logic levels.
  2. Communication between digital systems with varying voltage requirements.
  3. Data transfer between different generations of integrated circuits.
  4. Level shifting in mixed-voltage systems, ensuring compatibility between components.

Detailed and Complete Alternative Models

  • SN74HCT640N: Octal Bus Transceiver with 3-State Outputs
  • MC74HC640AN: High-Speed CMOS Logic Octal Bus Transceiver
  • CD74HCT640M: High-Speed CMOS Logic Octal Bus Transceiver

These alternative models offer similar functionality to the CD74HC640E and can be considered as alternatives based on specific project requirements.

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Sebutkan 10 pertanyaan dan jawaban umum terkait penerapan CD74HC640E dalam solusi teknis

Sure! Here are 10 common questions and answers related to the application of CD74HC640E in technical solutions:

  1. Q: What is CD74HC640E? A: CD74HC640E is a high-speed CMOS octal bus transceiver with 3-state outputs. It can be used for bidirectional data transfer between different voltage levels.

  2. Q: What is the operating voltage range of CD74HC640E? A: CD74HC640E operates within a voltage range of 2V to 6V.

  3. Q: Can CD74HC640E handle multiple voltage levels? A: Yes, CD74HC640E is designed to handle multiple voltage levels, making it suitable for interfacing between different logic families.

  4. Q: How many bits can CD74HC640E handle? A: CD74HC640E is an octal (8-bit) bus transceiver, meaning it can handle 8 bits of data simultaneously.

  5. Q: What is the maximum data transfer rate of CD74HC640E? A: CD74HC640E has a maximum data transfer rate of 25 MHz, making it suitable for high-speed applications.

  6. Q: Can CD74HC640E be used for level shifting? A: Yes, CD74HC640E can be used for level shifting as it supports bidirectional data transfer between different voltage levels.

  7. Q: Does CD74HC640E have internal pull-up or pull-down resistors? A: No, CD74HC640E does not have internal pull-up or pull-down resistors. External resistors may be required for proper operation.

  8. Q: Is CD74HC640E compatible with TTL logic? A: Yes, CD74HC640E is compatible with TTL logic levels, making it suitable for interfacing with TTL-based systems.

  9. Q: Can CD74HC640E be used in bus arbitration applications? A: Yes, CD74HC640E can be used in bus arbitration applications as it supports bidirectional data transfer and has 3-state outputs.

  10. Q: What is the package type of CD74HC640E? A: CD74HC640E is available in various package types, such as SOIC, TSSOP, and PDIP, providing flexibility for different PCB layouts and assembly methods.

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