SN65HVD21AD

Product Overview

Category

SN65HVD21AD belongs to the category of integrated circuits (ICs) specifically designed for use in industrial applications.

Use

This product is commonly used as a transceiver for communication between microcontrollers and various industrial devices. It facilitates reliable data transmission over long distances in harsh environments.

Characteristics

• Robustness: SN65HVD21AD is built to withstand extreme temperatures, voltage fluctuations, and electromagnetic interference.
• High-Speed Communication: It supports data rates up to 1 Mbps, enabling efficient and fast communication.
• Low Power Consumption: The IC is designed to minimize power consumption, making it suitable for battery-powered applications.
• ESD Protection: It provides electrostatic discharge (ESD) protection, ensuring the safety of connected devices.

Package

SN65HVD21AD is available in a small outline integrated circuit (SOIC) package, which allows for easy integration onto PCBs.

Essence

The essence of SN65HVD21AD lies in its ability to enable reliable and efficient communication between microcontrollers and industrial devices, even in challenging operating conditions.

Packaging/Quantity

This product is typically packaged in reels or tubes, with quantities varying depending on the supplier. Common packaging options include reels of 2500 units or tubes of 50 units.

Specifications

• Supply Voltage Range: 3.3V to 5V
• Data Rate: Up to 1 Mbps
• Operating Temperature Range: -40°C to +125°C
• Number of Pins: 8
• Interface Type: RS-485

Detailed Pin Configuration

1. A - Driver Output A
2. B - Driver Output B
3. GND - Ground
4. VCC - Power Supply
5. RO - Receiver Output
6. RE - Receiver Enable
7. DE - Driver Enable
8. DI - Driver Input

Functional Features

• Half-Duplex Communication: SN65HVD21AD supports half-duplex communication, allowing data transmission in both directions but not simultaneously.
• Receiver Enable (RE) Pin: This pin enables or disables the receiver circuitry, providing flexibility in controlling data reception.
• Driver Enable (DE) Pin: The DE pin controls the driver circuitry, enabling or disabling data transmission.
• Thermal Shutdown Protection: The IC incorporates thermal shutdown protection to prevent damage due to excessive heat.

Advantages and Disadvantages

Advantages

• Robust design ensures reliable operation in harsh industrial environments.
• High-speed communication capability facilitates efficient data transfer.
• Low power consumption makes it suitable for battery-powered applications.
• ESD protection safeguards connected devices from electrostatic discharge.

Disadvantages

• Limited to half-duplex communication, which may not be suitable for certain applications requiring simultaneous bidirectional data transfer.
• Requires additional external components for complete functionality.

Working Principles

SN65HVD21AD operates based on the RS-485 standard, which uses differential signaling for noise immunity and long-distance communication. It employs a balanced line driver and receiver to transmit and receive data over twisted-pair cables. The driver converts logic-level signals into differential voltages, while the receiver converts received differential voltages back into logic-level signals.

Detailed Application Field Plans

SN65HVD21AD finds extensive use in various industrial applications, including: - Building Automation Systems - Industrial Control Systems - Process Control Equipment - Motor Control Systems - Robotics - HVAC Systems - Energy Management Systems

Detailed and Complete Alternative Models

• MAX485
• LTC485
• ADM485
• SP485
• ST485

These alternative models offer similar functionality and can be used as substitutes for SN65HVD21AD in various applications.

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