Overview
The SN65HVD1791DRG4 is a fault-protected RS-485 transceiver from Texas Instruments, designed to operate in harsh industrial environments. This device combines a differential driver and a differential receiver, making it suitable for full-duplex communication. It is part of the SN65HVD17xx family, which is known for its robustness against overvoltage faults, mis-wiring, and ESD events. The SN65HVD1791DRG4 is characterized over a wide temperature range from –40°C to 105°C, ensuring reliable operation in various conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (14) | - |
| Body Size | 8.65 mm × 3.91 mm | - |
| Duplex Mode | Full | - |
| Signaling Rate | 115 kbps | - |
| Number of Nodes | Up to 256 | - |
| Cable Length | Up to 1500 m | - |
| Supply Voltage | 4.5-V to 5.5-V | V |
| Bus-Pin Fault Protection | ±70 V | V |
| Common-Mode Voltage Range | –20 V to 25 V | V |
| Operating Temperature | –40°C to 105°C | °C |
| Junction Temperature | –40°C to 150°C | °C |
Key Features
- Bus-pin fault protection up to ±70 V, ensuring robustness against direct shorts to power supplies, mis-wiring faults, and other overvoltage conditions.
- Wide common-mode voltage range of –20 V to 25 V, exceeding TIA/EIA 485 requirements.
- High ESD protection of ±16 kV according to JEDEC HBM standards.
- Low power consumption with a typical standby supply current of 1 μA and a quiescent current of 5 mA during operation.
- Glitch-free operation during power-up and power-down.
- Failsafe receiver for open-circuit, short-circuit, and idle-bus conditions.
- Reduced unit load for up to 256 nodes.
Applications
The SN65HVD1791DRG4 is designed for use in RS-485 and RS-422 networks, making it suitable for a variety of industrial and commercial applications. These include:
- Multipoint data transmission systems over long cable runs.
- Industrial automation and control systems.
- Building automation and control systems.
- Remote sensors and actuators.
- Point-of-sale terminals and other commercial equipment.
Q & A
- What is the primary function of the SN65HVD1791DRG4?
The SN65HVD1791DRG4 is a fault-protected RS-485 transceiver designed for full-duplex communication. - What are the key protection features of this device?
The device features bus-pin fault protection up to ±70 V and high ESD protection of ±16 kV. - What is the operating temperature range of the SN65HVD1791DRG4?
The device operates from –40°C to 105°C. - What is the maximum number of nodes supported by this transceiver?
Up to 256 nodes are supported. - What is the typical standby supply current of the SN65HVD1791DRG4?
The typical standby supply current is 1 μA. - Is the SN65HVD1791DRG4 suitable for multipoint applications?
Yes, it is suitable for multipoint applications over long cable runs. - What is the common-mode voltage range of this device?
The common-mode voltage range is –20 V to 25 V. - Does the SN65HVD1791DRG4 have failsafe receiver functionality?
Yes, it has failsafe receiver functionality for open-circuit, short-circuit, and idle-bus conditions. - What are the typical applications of the SN65HVD1791DRG4?
Typical applications include industrial automation, building automation, remote sensors, and point-of-sale terminals. - What is the signaling rate of the SN65HVD1791DRG4?
The signaling rate is 115 kbps.
