Overview
The SN65HVD1792 is a fault-protected RS-485 transceiver designed by Texas Instruments. This device is part of the SN65HVD17xx family and is characterized by its robust fault protection and wide common-mode voltage range. It combines a differential driver and a differential receiver, operating from a single power supply, making it suitable for full-duplex communication. The SN65HVD1792 is designed to survive overvoltage faults, mis-wiring faults, and ESD events, ensuring reliability in harsh environments. It is also optimized for hot-swappable applications with power-up and power-down glitch-free operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 4.5 to 5.5 | V |
| Bus Pin Fault Protection | ±70 | V |
| Common-Mode Voltage Range | –20 to +25 | V |
| Signaling Rate | Up to 1 Mbps | |
| Number of Nodes | Up to 256 | |
| Cable Length | Up to 150 m | |
| Operating Temperature | –40°C to 105°C | |
| ESD Protection | ±16 kV JEDEC HBM | |
| Quiescent Supply Current | 5 mA | |
| Standby Supply Current | 1 μA (typical) |
Key Features
- Fault protection up to ±70 V on bus pins, protecting against direct shorts to power supplies, mis-wiring faults, connector failures, and cable crushes.
- Wide common-mode voltage range of –20 V to +25 V, exceeding TIA/EIA 485 requirements.
- High ESD protection of ±16 kV JEDEC HBM.
- Reduced unit load for up to 256 nodes.
- Failsafe receiver for open-circuit, short-circuit, and idle-bus conditions.
- Low power consumption with a quiescent supply current of 5 mA and a standby supply current of 1 μA (typical).
- Power-up and power-down glitch-free operation, making it suitable for hot-swappable applications.
- Internal Power-On Reset circuit to ensure driver outputs are in a high-impedance state during power-up.
Applications
- RS-485 and RS-422 networks.
- Multipoint applications over long cable runs.
- Industrial automation and control systems.
- Building automation and control systems.
- Medical devices requiring robust communication interfaces.
- Hot-swappable or hot-pluggable applications.
Q & A
- What is the primary function of the SN65HVD1792?
The SN65HVD1792 is a fault-protected RS-485 transceiver that combines a differential driver and a differential receiver for full-duplex communication. - What is the range of the common-mode voltage for the SN65HVD1792?
The common-mode voltage range is –20 V to +25 V. - How much ESD protection does the SN65HVD1792 offer?
The SN65HVD1792 offers ±16 kV JEDEC HBM ESD protection. - What is the maximum number of nodes supported by the SN65HVD1792?
The device supports up to 256 nodes. - What is the typical quiescent supply current of the SN65HVD1792?
The typical quiescent supply current is 5 mA. - Is the SN65HVD1792 suitable for hot-swappable applications?
Yes, it is designed for hot-swappable applications with power-up and power-down glitch-free operation. - What is the operating temperature range of the SN65HVD1792?
The operating temperature range is –40°C to 105°C. - How does the SN65HVD1792 handle bus faults?
The device is designed to survive bus pin faults up to ±70 V and includes failsafe receiver functionality for open-circuit, short-circuit, and idle-bus conditions. - What type of communication does the SN65HVD1792 support?
The SN65HVD1792 supports full-duplex communication. - What are some common applications of the SN65HVD1792?
Common applications include RS-485 and RS-422 networks, industrial automation, building automation, medical devices, and hot-swappable applications.
