Overview
The SN65HVD1791DR is a 70-V fault-protected RS-485 transceiver designed by Texas Instruments. This device is part of the SN65HVD17xx family and is characterized by its robustness against overvoltage faults and ESD events. It combines a differential driver and a differential receiver, operating from a single power supply, making it suitable for full-duplex (four-wire bus) communication. The SN65HVD1791DR is packaged in a 14-pin SOIC (D) package and operates over a wide temperature range of –40°C to 105°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 14 | - |
| Operating Temperature Range | –40 to 105 | °C |
| Bus-Pin Fault Protection | ±70 V | V |
| Common-Mode Voltage Range | –20 to 25 | V |
| ESD Protection | ±16 kV JEDEC HBM | V |
| Signaling Rate | 115 kbps | - |
| Maximum Number of Nodes | Up to 256 | - |
| Supply Voltage | 4.5 to 5.5 | V |
| Quiescent Supply Current | 5 mA | - |
| Standby Supply Current | 1 µA (typical) | - |
Key Features
- Bus-Pin Fault Protection up to ±70 V
- Wide Common-Mode Voltage Range (–20 V to 25 V)
- Bus I/O Protection and ±16 kV JEDEC HBM ESD Protection
- Reduced Unit Load for up to 256 Nodes
- Failsafe Receiver for Open-Circuit, Short-Circuit, and Idle-Bus Conditions
- Low Power Consumption with Low Standby Supply Current (1 µA typical)
- Power-Up, Power-Down Glitch-Free Operation
Applications
The SN65HVD1791DR is designed for use in RS-485 and RS-422 networks. It is suitable for multipoint applications over long cable runs due to its wide common-mode voltage range. Typical applications include industrial automation, process control systems, and any environment where robust and reliable serial communication is required.
Q & A
- What is the primary function of the SN65HVD1791DR?
The SN65HVD1791DR is a fault-protected RS-485 transceiver that combines a differential driver and a differential receiver for full-duplex communication.
- What is the operating temperature range of the SN65HVD1791DR?
The device operates over a temperature range of –40°C to 105°C.
- What level of bus-pin fault protection does the SN65HVD1791DR offer?
The device offers bus-pin fault protection up to ±70 V.
- What is the common-mode voltage range of the SN65HVD1791DR?
The common-mode voltage range is –20 V to 25 V.
- How many nodes can the SN65HVD1791DR support?
The device can support up to 256 nodes.
- What is the signaling rate of the SN65HVD1791DR?
The signaling rate is 115 kbps.
- What is the quiescent supply current of the SN65HVD1791DR?
The quiescent supply current is 5 mA.
- Does the SN65HVD1791DR have ESD protection?
Yes, it offers ±16 kV JEDEC HBM ESD protection.
- What type of packaging does the SN65HVD1791DR come in?
The device is packaged in a 14-pin SOIC (D) package.
- Is the SN65HVD1791DR suitable for use in safety-critical applications?
It is designed to be robust, but specific use in safety-critical applications should be evaluated based on the device's specifications and the application's requirements.
