Overview
The SN65HVD1780D is a fault-protected RS-485 transceiver designed by Texas Instruments. This device is part of the SN65HVD178x family, which combines a differential driver and a differential receiver operating from a single power supply. It is engineered to survive overvoltage faults, such as direct shorts to power supplies, mis-wiring faults, connector failures, cable crushes, and tool mis-applications. The device also offers robust protection against ESD events, adhering to the human-body-model specification.
The SN65HVD1780D is fully compliant with ANSI TIA/EIA 485-A standards and can operate with both 3.3-V and 5-V supply voltages, making it versatile for various applications. It is pin-compatible with the industry-standard SN75176 transceiver, allowing for drop-in upgrades in most systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 105 | °C |
| Supply Voltage Range | 3.3-V to 5-V | - |
| Bus-Pin Fault Protection | ±70 V | - |
| ESD Protection | ±16 kV HBM | - |
| Signaling Rates | 115 kbps, 1 Mbps, up to 10 Mbps | - |
| Quiescent Current During Operation | 4 mA | - |
| Standby Supply Current | 1 µA Maximum | - |
Key Features
- Bus-Pin Fault Protection up to ±70 V
- Operation with 3.3-V to 5-V supply range
- ±16-kV HBM Protection on bus pins
- Reduced unit load for up to 320 nodes
- Failsafe receiver for open-circuit, short-circuit, and idle-bus conditions
- Low power consumption and low standby supply current
- Pin-compatible with industry-standard SN75176 transceiver
- Signaling rates of 115 kbps, 1 Mbps, and up to 10 Mbps
- Hot-plugging capability with power-up and power-down glitch-free operation
Applications
The SN65HVD1780D is commonly used in asynchronous data transmission applications, particularly in multipoint systems over long cable runs. It is suitable for various industrial and commercial environments due to its robust fault protection and ESD resilience.
- Multipoint applications over long cable runs
- Industrial control systems
- Building automation
- Remote sensors and actuators
- Hot-swappable or hot-pluggable systems
Q & A
- What is the operating temperature range of the SN65HVD1780D?
The operating temperature range is from -40°C to 105°C.
- What is the supply voltage range for the SN65HVD1780D?
The device operates with a supply voltage range of 3.3-V to 5-V.
- What level of bus-pin fault protection does the SN65HVD1780D offer?
The device offers bus-pin fault protection up to ±70 V.
- What is the ESD protection level of the SN65HVD1780D?
The device provides ±16 kV HBM ESD protection on bus pins.
- How many nodes can be supported on a common bus with the SN65HVD1780D?
Up to 320 nodes can be supported on a common bus.
- Is the SN65HVD1780D compatible with other industry-standard transceivers?
Yes, it is pin-compatible with the industry-standard SN75176 transceiver.
- What are the signaling rates supported by the SN65HVD1780D?
The device supports signaling rates of 115 kbps, 1 Mbps, and up to 10 Mbps.
- Does the SN65HVD1780D support hot-plugging applications?
Yes, it is designed for hot-plugging applications with power-up and power-down glitch-free operation.
- How does the SN65HVD1780D handle failsafe conditions?
The device features a failsafe receiver that ensures the output remains logic high under open-circuit, short-circuit, or idle-bus conditions.
- What is the standby supply current of the SN65HVD1780D?
The standby supply current is 1 µA maximum.
