Overview
The SN65HVD55DR is a high-output, full-duplex RS-485 driver and receiver produced by Texas Instruments. This device is designed for balanced transmission lines and is compliant with ANSI TIA/EIA-485A, TIA/EIA-422-B, ITU-T v.11, and ISO 8482:1993 standards. It operates with a 5-V power supply and features separate input and output pins for full-duplex bus communication designs. The SN65HVD55DR is packaged in a 14-pin SOIC (D) package and is characterized for operation from –40°C to 85°C, making it suitable for a wide range of industrial and commercial applications.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 5.0 | 5.5 | V |
| Signaling Rate | - | - | 1 Mbps | Mbps |
| Differential Load Resistance (RL) | 54 | - | 60 | Ω |
| High-Level Input Voltage (VIH) | - | - | 2 VCC | V |
| Low-Level Input Voltage (VIL) | 0 | - | 0.8 | V |
| Differential Input Voltage (VID) | -12 | - | 12 | V |
| High-Level Output Current (IOH) | -60 | - | - | mA |
| Low-Level Output Current (IOL) | 60 | - | - | mA |
| Operating Temperature Range | -40 | - | 85 | °C |
| Package Type | - | - | SOIC (D) 14-pin | - |
Key Features
- 1/8 Unit-load option available, supporting up to 256 nodes on the bus
- Bus-pin ESD protection exceeds 15 kV HBM
- Optional driver output transition times for signaling rates of 1 Mbps, 5 Mbps, and 25 Mbps
- Low-current standby mode with less than 1 µA current when both driver and receiver are disabled
- Glitch-free power-up and power-down bus I/Os
- Bus idle, open, and short circuit failsafe
- Designed for RS-422 and RS-485 networks
- High output feature providing more noise margin than typical RS-485 drivers, suitable for long cable and harsh noise environments
Applications
- Utility meters
- Chassis-to-chassis interconnects
- DTE/DCE Interfaces
- Industrial, process, and building automation
- Point-of-sale (POS) terminals and networks
Q & A
- What is the operating temperature range of the SN65HVD55DR?
The operating temperature range is from –40°C to 85°C.
- What is the maximum signaling rate supported by the SN65HVD55DR?
The maximum signaling rate supported is 1 Mbps for this specific model, though other models in the series support up to 25 Mbps.
- What type of package does the SN65HVD55DR come in?
The SN65HVD55DR comes in a 14-pin SOIC (D) package.
- What is the ESD protection level of the SN65HVD55DR?
The bus-pin ESD protection exceeds 15 kV HBM.
- How many nodes can be supported on the bus with the SN65HVD55DR?
The 1/8 unit-load option allows for up to 256 nodes on the bus.
- What is the standby current when both the driver and receiver are disabled?
The standby current is less than 1 µA when both the driver and receiver are disabled.
- Is the SN65HVD55DR designed for glitch-free power-up and power-down?
Yes, the SN65HVD55DR features glitch-free power-up and power-down bus I/Os.
- What standards is the SN65HVD55DR compliant with?
The SN65HVD55DR is compliant with ANSI TIA/EIA-485A, TIA/EIA-422-B, ITU-T v.11, and ISO 8482:1993 standards.
- What is the high-level output current of the SN65HVD55DR?
The high-level output current is -60 mA.
- What is the differential input voltage range of the SN65HVD55DR?
The differential input voltage range is from -12 V to 12 V.
