Overview
The SN65HVD22D, 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, making it suitable for applications requiring extended common-mode voltage ranges and high ESD protection.
The SN65HVD22D is particularly suited for harsh environments and long-cable networks, such as those found in factory automation, security networks, and building HVAC systems. Its features include controlled driver output slew rate for low radiated noise and improved signal quality, especially in emission-sensitive applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | 8-SOIC | |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage | 4.5 to 5.5 | V |
| Data Rate | Up to 500 kbps | |
| Common-Mode Voltage Range | -20 to 25 | V |
| Receiver Hysteresis | 100 to 130 mV | |
| ESD Protection | Over 16-kV HBM | |
| Standby Supply Current | 1 µA (maximum) | |
| Number of Nodes | Up to 256 |
Key Features
- Extended common-mode voltage range (-20 V to 25 V), more than doubling the TIA/EIA-485 requirement.
- Controlled driver output slew rate for low radiated noise and improved signal quality with long stubs.
- 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.
- Bus I/O protection and failsafe operation.
Applications
- Digital motor controllers.
- Remote sensors and terminals.
- Industrial process control.
- Security stations.
- Environmental control systems.
- Long-cable solutions in factory automation and building HVAC systems.
- Severe electrical environments such as electrical power inverters, industrial drives, and avionics.
Q & A
- What is the operating temperature range of the SN65HVD22D?
The operating temperature range is -40°C to 85°C.
- What is the maximum data rate supported by the SN65HVD22D?
The maximum data rate supported is up to 500 kbps.
- How many nodes can be connected using the SN65HVD22D?
Up to 256 nodes can be connected.
- What is the common-mode voltage range of the SN65HVD22D?
The common-mode voltage range is -20 V to 25 V.
- What kind of ESD protection does the SN65HVD22D offer?
The device offers ESD protection to over 16-kV HBM.
- What is the standby supply current of the SN65HVD22D?
The standby supply current is 1 µA (maximum).
- What is the receiver hysteresis of the SN65HVD22D?
The receiver hysteresis is more than 100 mV, typically 130 mV.
- Does the SN65HVD22D have failsafe operation?
Yes, it has failsafe operation for open-circuit, short-circuit, and idle-bus conditions.
- What is the package type of the SN65HVD22D?
The package type is 8-SOIC.
- What are some typical applications of the SN65HVD22D?
Typical applications include digital motor controllers, remote sensors, industrial process control, security stations, and environmental control systems.
