Overview
The SN65HVD485ED, produced by Texas Instruments, is a half-duplex transceiver designed for RS-485 data bus networks. This device is powered by a 5-V supply and is fully compliant with the TIA/EIA-485A standard. It is suitable for data transmission up to 10 Mbps over long twisted-pair cables and operates with very low supply current, typically less than 2 mA, exclusive of the load. The device features a wide common-mode range and high ESD protection levels, making it suitable for demanding applications such as electrical inverters, industrial automation networks, and telecommunications equipment. The SN65HVD485ED matches the industry-standard footprint of the SN75176 device and includes power-on reset circuits and a thermal-shutdown function for protection.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Drivers/Receivers | 1/1 | |
| Duplex | Half | |
| Receiver Hysteresis | 30 mV | |
| Data Rate | 10 Mbps | |
| Voltage - Supply | 4.5 V ~ 5.5 V | |
| Operating Temperature | -40°C ~ 85°C | |
| Package | 8-SOIC, 8-VSSOP, 8-PDIP | |
| Mounting Type | Surface Mount | |
| Bus-Pin ESD Protection | ±15 kV | |
| Number of Nodes on a Bus | Up to 64 |
Key Features
- Bus-pin ESD protection up to ±15 kV
- 1/2 Unit load: up to 64 nodes on a bus
- Bus-open-failsafe receiver
- Glitch-free power-up and power-down bus inputs and outputs
- Available in small VSSOP-8 package
- Meets or exceeds the requirements of the TIA/EIA-485A standard
- Industry-standard SN75176 footprint
- Internal biasing of the receiver input thresholds for open-circuit, bus-idle, or short-circuit failsafe conditions
- Typical hysteresis of 30 mV to improve noise immunity
- Thermal-shutdown function for device protection
Applications
- Motor control
- Power inverters
- Industrial automation
- Building automation networks
- Industrial process control
- Battery-powered applications
- Telecommunications equipment
- Cabled chassis interconnects
- Status/command signals across telecom racks
Q & A
- What is the SN65HVD485ED used for?
The SN65HVD485ED is a half-duplex transceiver designed for RS-485 data bus networks, suitable for various applications including industrial automation, motor control, and telecommunications.
- What is the data transmission rate of the SN65HVD485ED?
The SN65HVD485ED supports data transmission up to 10 Mbps.
- What is the operating temperature range of the SN65HVD485ED?
The device operates from -40°C to 85°C.
- What types of packages are available for the SN65HVD485ED?
The device is available in 8-SOIC, 8-VSSOP, and 8-PDIP packages.
- What is the ESD protection level of the SN65HVD485ED?
The device has bus-pin ESD protection up to ±15 kV.
- How many nodes can be connected on a bus using the SN65HVD485ED?
Up to 64 nodes can be connected on a bus.
- Does the SN65HVD485ED have any failsafe features?
Yes, it has a bus-open-failsafe receiver and internal biasing for open-circuit, bus-idle, or short-circuit conditions.
- What is the typical supply current of the SN65HVD485ED?
The typical supply current is less than 2 mA, exclusive of the load.
- Does the SN65HVD485ED have thermal protection?
Yes, it includes a thermal-shutdown function to protect the device from system-fault conditions.
- Is the SN65HVD485ED compliant with any industry standards?
Yes, it meets or exceeds the requirements of the TIA/EIA-485A standard.
- What is the significance of the industry-standard SN75176 footprint?
The SN65HVD485ED matches the industry-standard footprint of the SN75176 device, making it a compatible replacement in many applications.
