Overview
The SN65HVD22DR, produced by Texas Instruments, is a high-performance RS-485 transceiver that exceeds the typical requirements of the TIA/EIA-485-A standard. This device is part of the SN65HVD2x family, designed for bidirectional data transmission on multipoint twisted-pair cables. It operates over an extended range of common-mode voltages and features high ESD protection, wide receiver hysteresis, and failsafe operation, making it suitable for harsh environments and long-cable networks.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 5 | 5.5 | V |
| Operating Temperature Range | –40 | 85 | °C | |
| Junction Temperature Range | –40 | 130 | °C | |
| Common-Mode Voltage Range | –20 | 25 | V | |
| Signaling Rate | 500 kbps | |||
| ESD Protection | 16 kV HBM | |||
| Receiver Hysteresis | 100 | 130 | mV | |
| Standby Supply Current | 1 µA |
Key Features
- Common-mode voltage range (–20 V to 25 V) more than doubles TIA/EIA-485 requirement.
- Receiver equalization extends cable length and signaling rate.
- Reduced unit-load for up to 256 nodes.
- Bus I/O 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.
- Controlled driver output slew rate for low radiated noise and improved signal quality with long stubs.
Applications
- Long cable solutions in factory automation, security networks, and building HVAC systems.
- Severe electrical environments such as electrical power inverters, industrial drives, and avionics.
- Digital motor controllers, remote sensors and terminals, industrial process control, security stations, and environmental control systems.
Q & A
- What is the common-mode voltage range of the SN65HVD22DR?
The common-mode voltage range is from –20 V to 25 V, more than doubling the TIA/EIA-485 requirement.
- What is the maximum signaling rate for the SN65HVD22DR?
The maximum signaling rate is up to 500 kbps.
- How many nodes can be connected using the SN65HVD22DR?
Up to 256 nodes can be connected.
- What level of ESD protection does the SN65HVD22DR offer?
The device offers bus I/O protection to over 16-kV HBM.
- What is the standby supply current of the SN65HVD22DR?
The standby supply current is 1 µA (maximum).
- Does the SN65HVD22DR have failsafe operation?
Yes, it has failsafe receiver operation for open-circuit, short-circuit, and idle-bus conditions.
- What is the operating temperature range of the SN65HVD22DR?
The operating temperature range is from –40°C to 85°C.
- What is the receiver hysteresis of the SN65HVD22DR?
The receiver hysteresis is more than 100 mV.
- Is the SN65HVD22DR suitable for harsh environments?
Yes, it is designed for harsh environments and long-cable networks.
- What type of packaging is available for the SN65HVD22DR?
The device is available in an 8-pin SOIC (D) package.
