Overview
The SN65HVD1781DRG4 is a 70-V Fault-Protected RS-485 Transceiver produced by Texas Instruments. This device is designed to survive overvoltage faults, mis-wiring faults, connector failures, cable crushes, and tool mis-applications. It combines a differential driver and a differential receiver, operating from a single power supply, making it suitable for half-duplex (two-wire bus) communication. The SN65HVD1781DRG4 is fully compliant with ANSI TIA/EIA 485-A and can operate with both 3.3-V and 5-V supplies, making it versatile for various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Data Rate | 1 Mb/s | |
| Number of Drivers | 1 | |
| Number of Receivers | 1 | |
| Duplex Mode | Half Duplex | |
| Operating Temperature Range | -40°C to 125°C | |
| Power Supply Voltage | 3.3-V to 5-V | |
| Package Type | SOIC (8-pin) | |
| Package Size | 4.90 mm × 3.91 mm | |
| ESD Protection | ±16 kV Human Body Model (HBM) | |
| Fault Protection | Up to ±70 V |
Key Features
- Fault Protection: Designed to survive bus pin faults up to ±70 V and protect against direct shorts to power supplies, mis-wiring faults, connector failures, and cable crushes.
- ESD Protection: Internal ESD protection circuits protect the transceiver bus terminals against ±16 kV human body model (HBM) electrostatic discharges.
- Hot-Plugging Capability: Supports hot swap or hot pluggable applications with power-up and power-down glitch-free operation, default disabled input and output pins, and receiver failsafe.
- Receiver Failsafe: Provides internal biasing of the receiver input thresholds and large input-threshold hysteresis to maintain logic high under bus-idle, bus-short, or open bus conditions.
- Wide Common-Mode Voltage Range: Suitable for multipoint applications over long cable runs.
- Pin Compatibility: Pin-compatible with the industry-standard SN75176 transceiver, making it a drop-in upgrade in most systems.
Applications
The SN65HVD1781DRG4 is suitable for a variety of applications, including:
- Industrial Automation: For communication in industrial control systems and automation networks.
- Building Automation: Used in building management systems and smart building technologies.
- Medical Devices: Applicable in medical equipment requiring reliable and fault-tolerant communication.
- Aerospace and Defense: Utilized in military and aerospace applications where robust communication is critical.
- Transportation Systems: Employed in vehicle networks and transportation control systems.
Q & A
- What is the data rate of the SN65HVD1781DRG4?
The data rate of the SN65HVD1781DRG4 is up to 1 Mb/s. - What is the operating temperature range of the SN65HVD1781DRG4?
The operating temperature range is from -40°C to 125°C. - What type of ESD protection does the SN65HVD1781DRG4 offer?
The device offers ±16 kV Human Body Model (HBM) ESD protection. - Is the SN65HVD1781DRG4 suitable for hot-plugging applications?
Yes, it is designed to operate in hot swap or hot pluggable applications with glitch-free power-up and power-down. - What is the fault protection level of the SN65HVD1781DRG4?
The device can survive bus pin faults up to ±70 V. - Is the SN65HVD1781DRG4 compatible with the SN75176 transceiver?
Yes, it is pin-compatible with the industry-standard SN75176 transceiver. - What are the power supply voltage options for the SN65HVD1781DRG4?
The device can operate with both 3.3-V and 5-V power supplies. - What is the package type and size of the SN65HVD1781DRG4?
The package type is SOIC (8-pin) with a size of 4.90 mm × 3.91 mm. - Does the SN65HVD1781DRG4 have internal biasing for receiver input thresholds?
Yes, it provides internal biasing of the receiver input thresholds and large input-threshold hysteresis. - What are some common applications of the SN65HVD1781DRG4?
It is used in industrial automation, building automation, medical devices, aerospace and defense, and transportation systems.
