Overview
The SN65HVD1785DR, produced by Texas Instruments, is a fault-protected RS-485 transceiver designed to operate in harsh environments. This device combines a differential driver and a differential receiver, making it suitable for half-duplex (two-wire bus) communication. It is characterized by its robustness against overvoltage faults, ESD events, and its ability to operate over a wide temperature range from –40°C to 105°C. The SN65HVD1785DR is ideal for multipoint applications over long cable runs due to its extended common-mode voltage range and low power consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | |
| Pins | 8 | |
| Operating Temperature Range | –40 to 105 | °C |
| Supply Voltage | 4.5 to 5.5 | V |
| Bus Pin Fault Protection | ±70 | V |
| Common-Mode Voltage Range | –20 to 25 | V |
| Signaling Rate | 115 kbps | |
| Maximum Number of Nodes | Up to 256 | |
| ESD Protection | ±16 kV JEDEC HBM | |
| Standby Supply Current | 1 µA (typical) | |
| Quiescent Supply Current | 5 mA (typical) |
Key Features
- Bus-Pin Fault Protection up to ±70 V
- Extended Common-Mode Voltage Range (–20 V to 25 V)
- Bus I/O Protection with ±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) and Quiescent Supply Current (5 mA typical)
- Power-Up, Power-Down Glitch-Free Operation
Applications
The SN65HVD1785DR is designed for use in RS-485 and RS-422 networks. It is particularly suitable for multipoint applications over long cable runs, such as in industrial automation, process control, and building automation systems. Additionally, it can be used in applications requiring high reliability and robustness against electrical faults and ESD events.
Q & A
- What is the operating temperature range of the SN65HVD1785DR?
The operating temperature range is from –40°C to 105°C.
- What is the maximum bus pin fault protection voltage for the SN65HVD1785DR?
The maximum bus pin fault protection voltage is ±70 V.
- What is the common-mode voltage range of the SN65HVD1785DR?
The common-mode voltage range is from –20 V to 25 V.
- How many nodes can the SN65HVD1785DR support?
The device can support up to 256 nodes.
- What is the signaling rate of the SN65HVD1785DR?
The signaling rate is 115 kbps.
- Does the SN65HVD1785DR have ESD protection?
Yes, it has ±16 kV JEDEC HBM ESD protection.
- What is the typical standby supply current of the SN65HVD1785DR?
The typical standby supply current is 1 µA.
- Is the SN65HVD1785DR suitable for half-duplex or full-duplex communication?
The SN65HVD1785DR is suitable for half-duplex (two-wire bus) communication.
- What type of package is the SN65HVD1785DR available in?
The device is available in an 8-pin SOIC (D) package.
- Does the SN65HVD1785DR have failsafe receiver functionality?
Yes, it has a failsafe receiver for open-circuit, short-circuit, and idle-bus conditions.
