Overview
The SN65HVD74DGKR is a 3.3-V full-duplex RS-485 transceiver produced by Texas Instruments. This device is part of the SN65HVD7x family, which is designed for high-speed data transmission in harsh operating environments. The SN65HVD74DGKR combines a differential driver and a differential receiver, operating from a single 3.3-V power supply, making it suitable for multi-point applications over long cable runs.
This transceiver is fully enabled with no external enabling pins, simplifying the design process. It features high levels of ESD protection, including > ±30-kV HBM and > ±12-kV IEC61000-4-2 contact discharge, and a wide operating temperature range from –40°C to 125°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | -0.5 | - | 5 | V |
| Voltage Range at any Bus Pin (A, B, Y, or Z) | -13 | - | 16.5 | V |
| Receiver High-Level Output Voltage (VOH) | 2.4 | - | VCC - 0.3 | V |
| Receiver Low-Level Output Voltage (VOL) | 0.2 | - | 0.4 | V |
| Driver Input, Driver Enable, and Receiver Enable Input Current (II) | -3 | - | 3 | µA |
| Receiver Output High-Impedance Current (IOZ) | - | - | - | µA |
| Driver Differential Output Rise/Fall Time (tr, tf) | 100 | - | 750 | ns |
| Driver Propagation Delay (tPHL, tPLH) | 350 | - | 550 | ns |
| Operating Temperature Range | -40 | - | 125 | °C |
| Package Type | - | - | MSOP (8 pins) | - |
| Body Size (Nominal) | - | - | 3.00 mm × 3.00 mm | - |
Key Features
- Full-duplex RS-485 transceiver with separate input and output pins for bus communication.
- Operates from a single 3.3-V power supply.
- High ESD protection: > ±30-kV HBM and > ±12-kV IEC61000-4-2 contact discharge.
- Wide common-mode voltage range, suitable for multi-point applications over long cable runs.
- Large receiver hysteresis for immunity to conducted differential noise.
- Low standby current: less than 5 µA when both driver and receiver are disabled.
- Available in small-footprint MSOP and standard SOIC packages.
- Supports up to 256 nodes on the bus.
- Wide operating temperature range from –40°C to 125°C.
Applications
- Industrial automation and control systems.
- Building automation and HVAC systems.
- Point-of-sale terminals and other commercial equipment.
- Medical devices requiring reliable data transmission.
- Automotive systems, including in-vehicle networks.
- Remote sensors and data acquisition systems.
Q & A
- What is the operating voltage range of the SN65HVD74DGKR?
The SN65HVD74DGKR operates from a single 3.3-V power supply, with a voltage range of –0.5 V to 5 V.
- What is the maximum ESD protection level for the SN65HVD74DGKR?
The device offers > ±30-kV HBM and > ±12-kV IEC61000-4-2 contact discharge ESD protection.
- What is the maximum number of nodes supported on the bus?
The SN65HVD74DGKR supports up to 256 nodes on the bus.
- What are the package options available for the SN65HVD74DGKR?
The device is available in MSOP (8 pins) and SOIC (8 pins) packages.
- What is the operating temperature range of the SN65HVD74DGKR?
The device operates over a temperature range from –40°C to 125°C.
- How much standby current does the SN65HVD74DGKR consume when disabled?
The standby current is less than 5 µA when both the driver and receiver are disabled.
- What is the typical driver propagation delay for the SN65HVD74DGKR?
The typical driver propagation delay is between 350 ns and 550 ns.
- What is the receiver output rise/fall time for the SN65HVD74DGKR?
The receiver output rise/fall time is between 13 ns and 25 ns.
- Is the SN65HVD74DGKR suitable for multi-point applications?
Yes, it is suitable for multi-point applications over long cable runs due to its wide common-mode voltage range.
- What are some common applications of the SN65HVD74DGKR?
Common applications include industrial automation, building automation, point-of-sale terminals, medical devices, automotive systems, and remote sensors.
