Overview
The SN65HVD74D is a 3.3-V full-duplex RS-485 transceiver produced by Texas Instruments. This device is part of the SN65HVD7x family, which extends the RS-485 portfolio with robust 3.3-V drivers and receivers, offering high levels of ESD protection. The SN65HVD74D operates from a single 3.3-V power supply and features separate input and output pins for full-duplex bus communication designs. It is designed to provide reliability in harsh operating environments, with an extended industrial temperature range of –40°C to 125°C and large receiver hysteresis for noise rejection.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | –0.5 | 5.5 | V | |
| Voltage Range at any Bus Pin (A, B, Y, or Z) | –13 | 16.5 | V | |
| Input Voltage Range at any Logic Pin (D, DE, or RE) | –0.3 | 5.7 | V | |
| Operating Temperature Range | –40 | 125 | °C | |
| Quiescent Supply Current (ICC) | 1.1 mA | mA | ||
| Standby Supply Current | 10 nA (Typ) | < 5 µA (Max) | µA | |
| Receiver Output High-Level Voltage (VOH) | 2.4 | VCC–0.3 | V | |
| Receiver Output Low-Level Voltage (VOL) | 0.2 | 0.4 | V | |
| Driver Short-Circuit Output Current (IOS) | –150 | 150 | mA |
Key Features
- 1/8 Unit-load options available, supporting up to 256 nodes on the bus.
- High levels of ESD protection: > ±30-kV HBM, > ±12-kV IEC61000-4-2 contact discharge, and > ±4-kV IEC61000-4-4 fast transient burst.
- Extended industrial temperature range: –40°C to 125°C.
- Large receiver hysteresis (70 mV) for noise rejection.
- Low power consumption: < 1.1-mA quiescent current during operation, and low standby supply current: 10 nA (Typ), < 5 µA (Max).
- Glitch-free power-up and power-down protection for hot-plugging applications.
- 5-V tolerant logic inputs compatible with 3.3-V or 5-V controllers.
- Signaling rate options optimized for 400 kbps, 20 Mbps, and 50 Mbps.
Applications
- E-meters.
- Industrial Automation.
- Building Automation.
- Security and Surveillance.
- Encoders and Decoders.
- Factory Automation.
- Telecommunications Infrastructure.
- Motion Control.
Q & A
- What is the operating temperature range of the SN65HVD74D?
The operating temperature range is –40°C to 125°C.
- What are the signaling rate options for the SN65HVD74D?
The signaling rate options are optimized for 400 kbps, 20 Mbps, and 50 Mbps.
- How many nodes can be connected on the bus using the SN65HVD74D?
Up to 256 nodes can be connected on the bus.
- What is the quiescent supply current of the SN65HVD74D?
The quiescent supply current is less than 1.1 mA during operation.
- Does the SN65HVD74D have ESD protection?
Yes, it has high levels of ESD protection, including > ±30-kV HBM, > ±12-kV IEC61000-4-2 contact discharge, and > ±4-kV IEC61000-4-4 fast transient burst.
- Is the SN65HVD74D compatible with 5-V logic inputs?
Yes, it has 5-V tolerant logic inputs compatible with 3.3-V or 5-V controllers.
- What is the standby supply current of the SN65HVD74D?
The standby supply current is 10 nA (Typ) and less than 5 µA (Max).
- Does the SN65HVD74D support hot-plugging applications?
Yes, it has glitch-free power-up and power-down protection for hot-plugging applications.
- What are the common applications of the SN65HVD74D?
Common applications include E-meters, Industrial Automation, Building Automation, Security and Surveillance, Encoders and Decoders, Factory Automation, Telecommunications Infrastructure, and Motion Control.
- What package types are available for the SN65HVD74D?
The SN65HVD74D is available in standard SOIC and small-footprint MSOP packages.
