SN74AHCT245DWRG4

Product Overview

• Category: Integrated Circuit
• Use: Level Shifter/Transceiver
• Characteristics: High-Speed, Non-Inverting, 8-Bit Bidirectional Transceiver
• Package: SOIC-20
• Essence: The SN74AHCT245DWRG4 is a high-speed, non-inverting, 8-bit bidirectional transceiver designed for asynchronous communication between two data buses. It can be used to shift voltage levels and enable bidirectional data transfer between systems operating at different voltage levels.
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• High-Level Input Voltage: 2V (min), 5.5V (max)
• Low-Level Input Voltage: -0.5V (min), 0.8V (max)
• High-Level Output Voltage: 4.4V (min), 5.3V (max)
• Low-Level Output Voltage: 0.1V (min), 0.1V (max)
• Maximum Operating Frequency: 80MHz
• Propagation Delay Time: 10ns (typical)

Detailed Pin Configuration

The SN74AHCT245DWRG4 has a total of 20 pins arranged as follows:

__ __ A1 |1 \__/ 20| VCC A2 |2 19| B1 A3 |3 18| B2 A4 |4 17| B3 A5 |5 16| B4 A6 |6 15| B5 A7 |7 14| B6 A8 |8 13| B7 GND |9 12| B8 OE |10 11| DIR ‾‾ ‾‾

Functional Features

• Bidirectional Data Transfer: The SN74AHCT245DWRG4 allows for bidirectional data transfer between two buses operating at different voltage levels.
• Voltage Level Shifting: It can shift the voltage levels of the input and output signals to match the requirements of the connected systems.
• High-Speed Operation: With a maximum operating frequency of 80MHz, it enables fast data transmission.
• Non-Inverting: The transceiver does not invert the logic level of the input signals during data transfer.

Advantages and Disadvantages

Advantages: - Enables communication between systems with different voltage levels - Fast data transfer speed - Non-inverting operation ensures signal integrity

Disadvantages: - Limited to 8-bit data transfer - Requires careful consideration of voltage compatibility between systems

Working Principles

The SN74AHCT245DWRG4 operates by receiving data from one bus and transmitting it to another. It uses a direction control pin (DIR) to determine the direction of data flow. When DIR is high, data is transmitted from Bus A to Bus B, and when DIR is low, data is transmitted from Bus B to Bus A. The output enable pin (OE) is used to enable or disable the outputs. When OE is low, the outputs are active, and when OE is high, the outputs are in a high-impedance state.

Detailed Application Field Plans

The SN74AHCT245DWRG4 is commonly used in various applications, including:

1. Microcontroller Interfacing: It facilitates communication between microcontrollers operating at different voltage levels.
2. Level Shifting in Communication Systems: It is used to shift voltage levels in communication systems, such as UART, SPI, and I2C interfaces.
3. Data Bus Communication: It enables bidirectional data transfer between different buses, such as address buses and data buses in computer systems.

Detailed and Complete Alternative Models

1. SN74AHCT245PW: This model has the same functionality but comes in a TSSOP-20 package.
2. SN74LVC245APW: A similar transceiver with lower power consumption and a wider supply voltage range.
3. SN74LVCHT245ADGVR: This model offers higher speed and lower propagation delay time.

These alternative models provide similar functionality to the SN74AHCT245DWRG4 but may have differences in package type, power consumption, or performance specifications.

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