Overview
The SN65HVD1785D is a fault-protected RS-485 transceiver designed and manufactured by Texas Instruments. This device is part of the SN65HVD17xx family, known for its robustness and extended common-mode voltage range. 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 SN65HVD1785D is characterized by its ability to survive overvoltage faults, mis-wiring faults, and ESD events, ensuring reliable operation in harsh environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC (D) | |
| Pins | 8 | |
| Operating Temperature Range | -40 to 105 | °C |
| Common-Mode Voltage Range | -20 to 25 | V |
| Fault Protection | ±70 V | |
| HBM ESD Protection | ±16 kV | |
| Number of Nodes | Up to 256 | |
| Signaling Rate (Max) | 115 kbps | |
| Supply Voltage (Nom) | 5 V | |
| ICC (Max) | 6 mA | |
| Standby Supply Current | 1 µA (Typical) |
Key Features
- Bus-Pin Fault Protection up to ±70 V
- Common-Mode Voltage Range of -20 V to 25 V, more than doubling TIA/EIA 485 requirements
- 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) and quiescent current (5 mA during operation)
- Power-Up, Power-Down Glitch-Free Operation
Applications
The SN65HVD1785D is designed for use in RS-485 and RS-422 networks. It is particularly suitable for multipoint applications over long cable runs due to its wide common-mode voltage range. This device is ideal for industrial automation, process control systems, and any environment where robust and reliable serial communication is required.
Q & A
- What is the operating temperature range of the SN65HVD1785D?
The operating temperature range is -40°C to 105°C.
- What is the common-mode voltage range of the SN65HVD1785D?
The common-mode voltage range is -20 V to 25 V.
- How many nodes can the SN65HVD1785D support?
The device can support up to 256 nodes.
- What is the maximum signaling rate of the SN65HVD1785D?
The maximum signaling rate is 115 kbps.
- What type of ESD protection does the SN65HVD1785D offer?
The device offers ±16 kV JEDEC HBM ESD protection.
- What is the typical standby supply current of the SN65HVD1785D?
The typical standby supply current is 1 µA.
- Is the SN65HVD1785D suitable for half-duplex or full-duplex communication?
The SN65HVD1785D is suitable for half-duplex (two-wire bus) communication.
- What kind of fault protection does the SN65HVD1785D provide?
The device provides bus-pin fault protection up to ±70 V.
- Does the SN65HVD1785D have failsafe receiver functionality?
Yes, it has failsafe receiver functionality for open-circuit, short-circuit, and idle-bus conditions.
- What is the package type and pin count of the SN65HVD1785D?
The package type is SOIC (D) with 8 pins.
