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SN74AS245DWRE4
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SN74AS245DWRE4

Product Overview

  • Category: Integrated Circuit
  • Use: Bus Transceiver
  • Characteristics: High-speed, bidirectional, voltage-level translation
  • Package: SOIC (Small Outline Integrated Circuit)
  • Essence: Transfers data between two bidirectional bus systems with different voltage levels
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Supply Voltage Range: 4.5V to 5.5V
  • Input Voltage Range: 0V to VCC
  • Output Voltage Range: 0V to VCC
  • Operating Temperature Range: -40°C to +85°C
  • Propagation Delay Time: 6ns (typical)
  • Output Drive Capability: ±24mA

Detailed Pin Configuration

The SN74AS245DWRE4 has a total of 20 pins, which are assigned as follows:

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

Functional Features

  • Bidirectional data transfer between two bus systems with different voltage levels
  • Automatic direction control based on DIR pin input
  • Output enable/disable control using OE pin
  • High-speed operation for efficient data transmission
  • Voltage-level translation for compatibility between different logic families

Advantages and Disadvantages

Advantages: - Enables communication between bus systems with different voltage levels - Supports bidirectional data transfer - High-speed operation allows for efficient data transmission

Disadvantages: - Limited to specific voltage ranges (4.5V to 5.5V) - Requires careful consideration of input and output voltage levels

Working Principles

The SN74AS245DWRE4 is a bidirectional bus transceiver that facilitates data transfer between two bus systems operating at different voltage levels. The direction of data flow is controlled by the DIR pin, which determines whether data is transmitted from A to B or from B to A.

The OE pin enables or disables the outputs, allowing for control over when data is transmitted. When the OE pin is high, the outputs are enabled, and data can be transferred. Conversely, when the OE pin is low, the outputs are disabled, preventing data transfer.

The device performs voltage-level translation, ensuring compatibility between different logic families. It operates within a specified supply voltage range and provides fast propagation delay times for efficient data transmission.

Detailed Application Field Plans

The SN74AS245DWRE4 is commonly used in various applications where bidirectional data transfer is required between bus systems operating at different voltage levels. Some typical application fields include:

  1. Microcontroller interfacing: The transceiver facilitates communication between microcontrollers operating at different voltage levels, enabling seamless integration of multiple systems.
  2. Industrial automation: It is utilized in industrial automation systems to connect devices with varying voltage requirements, such as sensors, actuators, and control units.
  3. Communication networks: The transceiver plays a crucial role in networking equipment, allowing for data exchange between devices with different voltage levels, such as routers, switches, and network interface cards.

Detailed and Complete Alternative Models

  1. SN74LVC245A: Low-voltage CMOS bus transceiver
  2. SN74HCT245: High-speed CMOS bus transceiver
  3. SN74LVCH245A: Low-voltage CMOS bus transceiver with 3-state outputs
  4. SN74ACT245: Advanced CMOS bus transceiver

These alternative models offer similar functionality to the SN74AS245DWRE4 but may have different characteristics, specifications, or package options. It is important to select the appropriate model based on specific application requirements.

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Enumere 10 preguntas y respuestas comunes relacionadas con la aplicación de SN74AS245DWRE4 en soluciones técnicas

Sure! Here are 10 common questions and answers related to the application of SN74AS245DWRE4 in technical solutions:

  1. Q: What is SN74AS245DWRE4? A: SN74AS245DWRE4 is a bidirectional octal bus transceiver with 3-state outputs, commonly used for level shifting and signal buffering in digital systems.

  2. Q: What is the operating voltage range of SN74AS245DWRE4? A: The operating voltage range is typically between 4.5V and 5.5V.

  3. Q: How many data lines can SN74AS245DWRE4 handle? A: SN74AS245DWRE4 can handle 8 data lines, as it is an octal (8-bit) transceiver.

  4. Q: Can SN74AS245DWRE4 be used for both level shifting and voltage translation? A: Yes, SN74AS245DWRE4 can be used for both level shifting (e.g., from 3.3V to 5V) and voltage translation (e.g., from 5V to 3.3V).

  5. Q: What is the maximum data transfer rate supported by SN74AS245DWRE4? A: SN74AS245DWRE4 supports a maximum data transfer rate of 24 MHz.

  6. Q: Does SN74AS245DWRE4 have any built-in protection features? A: No, SN74AS245DWRE4 does not have built-in protection features. Additional external protection may be required depending on the application.

  7. Q: Can SN74AS245DWRE4 be used in both parallel and serial communication systems? A: Yes, SN74AS245DWRE4 can be used in both parallel and serial communication systems, depending on the configuration and requirements.

  8. Q: What is the power supply current consumption of SN74AS245DWRE4? A: The power supply current consumption typically ranges from 10 mA to 20 mA, depending on the operating conditions.

  9. Q: Can SN74AS245DWRE4 be used in automotive applications? A: Yes, SN74AS245DWRE4 is qualified for automotive applications and meets the necessary standards.

  10. Q: Are there any recommended layout guidelines for using SN74AS245DWRE4? A: Yes, Texas Instruments provides layout guidelines in the datasheet for optimal performance, including recommendations for decoupling capacitors and signal integrity considerations.

Please note that these answers are general and may vary based on specific application requirements and the datasheet provided by the manufacturer.