Overview
The SN65HVD20DR, produced by Texas Instruments, is a high-performance RS-485 transceiver that exceeds the typical requirements of RS-485 devices. It is part of the SN65HVD2x family, designed for bidirectional data transmission on multipoint twisted-pair cables. This device operates from a single 5-V power supply and combines a 3-state differential driver and a differential receiver, offering minimum loading to the bus. The SN65HVD20DR is suitable for applications requiring extended common-mode voltage ranges and high ESD protection, making it ideal for harsh environments such as long-cable networks and industrial settings.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (8) | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage | 4.5 to 5.5 | V |
| Common-Mode Voltage Range | -20 to 25 | V |
| Signaling Rate | Up to 25 Mbps | - |
| Number of Nodes | Up to 64 | - |
| Cable Length | Up to 50 m at 25 Mbps | m |
| ESD Protection | Over 16-kV HBM | - |
| Receiver Hysteresis | More than 100 mV | mV |
| Standby Supply Current | 1 µA (maximum) | µA |
| Junction Temperature | -40 to 130 | °C |
Key Features
- Extended common-mode voltage range (-20 V to 25 V), more than doubling the TIA/EIA-485 requirement.
- High ESD protection to over 16-kV HBM.
- Failsafe receiver for open-circuit, short-circuit, and idle-bus conditions.
- Low standby supply current of 1 µA (maximum).
- More than 100 mV receiver hysteresis.
- Reduced unit-load for up to 256 nodes in other family members.
- Receiver equalization extends cable length and signaling rate in some family members.
- Controlled driver output slew rate for low radiated noise and improved signal quality in emission-sensitive applications.
Applications
- Long-cable networks and industrial settings where harsh environments are prevalent.
- Digital motor controllers.
- Remote sensors and terminals.
- Industrial process control.
- Security stations.
- Environmental control systems.
- Factory automation.
- Building HVAC systems.
- Electrical power inverters.
- Industrial drives.
- Avionics.
Q & A
- What is the operating temperature range of the SN65HVD20DR?
The operating temperature range is from -40°C to 85°C.
- What is the common-mode voltage range of the SN65HVD20DR?
The common-mode voltage range is from -20 V to 25 V.
- What is the maximum signaling rate of the SN65HVD20DR?
The maximum signaling rate is up to 25 Mbps.
- How many nodes can be connected using the SN65HVD20DR?
Up to 64 nodes can be connected.
- What is the maximum cable length supported by the SN65HVD20DR at its maximum signaling rate?
The maximum cable length is up to 50 meters at 25 Mbps.
- What level of ESD protection does the SN65HVD20DR offer?
The device offers ESD protection to over 16-kV HBM.
- What is the standby supply current of the SN65HVD20DR?
The standby supply current is 1 µA (maximum).
- Does the SN65HVD20DR have failsafe operation?
- What is the receiver hysteresis of the SN65HVD20DR?
The receiver hysteresis is more than 100 mV.
- What are some typical applications of the SN65HVD20DR?
Typical applications include digital motor controllers, remote sensors and terminals, industrial process control, security stations, and environmental control systems.
