Overview
The SN65HVD22DRG4, produced by Texas Instruments, is part of the SN65HVD2x family of extended common-mode RS-485 transceivers. These devices are designed to offer enhanced performance and reliability in various industrial and communication applications. The SN65HVD22DRG4 is particularly suited for environments requiring high signaling rates, long cable lengths, and robust ESD protection.
This transceiver meets and exceeds the requirements of the TIA/EIA-485-A standard, operating over an extended range of common-mode voltages from –20 V to 25 V. It features a controlled driver output slew rate, which reduces high-frequency noise emissions and improves signal quality, especially in emission-sensitive applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 5 | 5.5 | V |
| Voltage at any bus I/O terminal | –20 | 25 | V | |
| Signaling Rate | 500 kbps | |||
| Number of Nodes | 256 | |||
| Operating Temperature (TA) | –40 | 85 | °C | |
| Junction Temperature (TJ) | –40 | 130 | °C | |
| Driver Output Current | –110 | 110 | mA | |
| Receiver Output Current | –8 | 8 | mA | |
| Supply Current (ICC) | 4 | 7 | 9 | mA |
| Standby Supply Current | 1 | µA |
Key Features
- Extended common-mode voltage range from –20 V to 25 V, exceeding TIA/EIA-485-A requirements.
- Receiver equalization for improved jitter performance and extended cable lengths.
- Controlled driver output slew rate to reduce high-frequency noise emissions.
- Support for up to 256 nodes.
- High ESD protection (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.
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.
Q & A
- What is the common-mode voltage range of the SN65HVD22DRG4?
The common-mode voltage range is from –20 V to 25 V.
- What is the maximum signaling rate supported by the SN65HVD22DRG4?
The maximum signaling rate is up to 500 kbps.
- How many nodes can be connected using the SN65HVD22DRG4?
Up to 256 nodes can be connected.
- What is the operating temperature range of the SN65HVD22DRG4?
The operating temperature range is from –40°C to 85°C.
- What is the standby supply current of the SN65HVD22DRG4?
The standby supply current is 1 µA (maximum).
- Does the SN65HVD22DRG4 have ESD protection?
Yes, it has high ESD protection (over 16-kV HBM).
- What is the purpose of the receiver equalization feature in the SN65HVD22DRG4?
The receiver equalization feature improves jitter performance and allows for longer cable lengths.
- What are some typical applications of the SN65HVD22DRG4?
Typical applications include long cable solutions in factory automation, security networks, and building HVAC systems, as well as severe electrical environments like electrical power inverters and industrial drives.
- How does the controlled driver output slew rate benefit the SN65HVD22DRG4?
The controlled driver output slew rate reduces high-frequency noise emissions and improves signal quality, especially in emission-sensitive applications.
- What is the failsafe receiver feature in the SN65HVD22DRG4?
The failsafe receiver ensures proper operation during open-circuit, short-circuit, and idle-bus conditions.
