Overview
The SN65HVD50D, produced by Texas Instruments, is a high-output, full-duplex RS-485 driver and receiver. This device is part of the SN65HVD5x family, designed for balanced transmission lines and compliance 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 is characterized for operation from –40°C to 85°C. The SN65HVD50D is fully enabled with no external enabling pins, making it suitable for a variety of industrial and communication applications.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 5 | 5.5 | V |
| Signaling Rate | - | - | 25 Mbps | Mbps |
| Differential Load Resistance (RL) | 54 | - | 60 | Ω |
| High-Level Input Voltage (VIH) | - | - | 2 V | V |
| Low-Level Input Voltage (VIL) | 0 | - | 0.8 V | V |
| Differential Input Voltage (VID) | -12 | - | 12 V | V |
| High-Level Output Current (IOH) | -60 | - | - | mA |
| Low-Level Output Current (IOL) | 60 | - | - | mA |
| Propagation Delay Time (tPLH, tPHL) | 4 | 8 | 12 | ns |
| Differential Output Signal Rise Time (tr) | 3 | 6 | 12 | ns |
| Differential Output Signal Fall Time (tf) | 3 | 6 | 11 | ns |
| Supply Current (ICC) | - | - | 2.7 mA | mA |
| Thermal Shutdown Junction Temperature (TJSD) | - | - | 165°C | °C |
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 current less than 1 μA.
- 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.
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 SN65HVD50D?
The SN65HVD50D operates from –40°C to 85°C.
- What are the signaling rates supported by the SN65HVD50D?
The SN65HVD50D supports signaling rates of 25 Mbps.
- Does the SN65HVD50D have ESD protection?
- What is the standby current of the SN65HVD50D?
The standby current is less than 1 μA when both the driver and receiver are disabled.
- Is the SN65HVD50D compatible with RS-422 and RS-485 networks?
- What is the differential output voltage of the SN65HVD50D?
The differential output voltage (|VOD|) ranges from 1.5 V to 3.5 V over the common-mode voltage range.
- Does the SN65HVD50D have glitch-free power-up and power-down bus I/Os?
- What is the thermal shutdown junction temperature of the SN65HVD50D?
The thermal shutdown junction temperature is 165°C.
- Can the SN65HVD50D be used in harsh noise environments?
- How many nodes can be supported on the bus with the SN65HVD50D?
