Overview
The SN65HVD78D is a 3.3-V half-duplex RS-485 transceiver produced by Texas Instruments. This device is designed for demanding industrial applications, offering robust 3.3-V drivers and receivers in a compact package. It operates from a single 3.3-V power supply and features a wide common-mode voltage range, making it suitable for multi-point applications over long cable runs. The device is characterized over an extended industrial temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 3 to 3.6 | V |
| Operating Temperature | –40 to 125 | °C |
| Signaling Rate | Up to 50 Mbps | |
| Differential Load Resistance | 54 to 60 | Ω |
| Differential Load Capacitance | 50 | pF |
| Driver Output Current | –60 to 60 | mA |
| Receiver Output Current | –8 to 8 | mA |
| Quiescent Supply Current | < 1 mA | |
| Standby Supply Current | < 2 µA | |
| Package Type | SOIC (8-pin), VSSOP (8-pin), VSON (8-pin) | |
| ESD Protection | ±4 kV IEC 61000-4-4 Fast Transient Burst |
Key Features
- Robust 3.3-V drivers and receivers with high levels of ESD protection to Human-Body Model and IEC Contact Discharge specifications.
- Signaling rate options optimized for 250 kbps, 20 Mbps, and 50 Mbps.
- 5-V tolerant logic inputs compatible with 3.3-V or 5-V controllers.
- Low power consumption with quiescent supply current less than 1 mA and standby supply current less than 2 µA.
- Glitch-free power-up and power-down bus inputs and outputs.
- Large receiver hysteresis (80 mV) for noise rejection.
- Low unit-loading allows over 200 connected nodes.
- Wide common-mode voltage range suitable for multi-point applications over long cable runs.
Applications
- Factory Automation
- Telecommunications Infrastructure
- Motion Control
Q & A
- What is the operating temperature range of the SN65HVD78D?
The operating temperature range is –40°C to 125°C.
- What are the signaling rate options for the SN65HVD78D?
The signaling rate options are 250 kbps, 20 Mbps, and 50 Mbps.
- What type of ESD protection does the SN65HVD78D offer?
The device offers ±4 kV IEC 61000-4-4 Fast Transient Burst ESD protection.
- Is the SN65HVD78D compatible with 5-V logic inputs?
Yes, the device has 5-V tolerant logic inputs compatible with 3.3-V or 5-V controllers.
- What is the typical quiescent supply current of the SN65HVD78D?
The quiescent supply current is less than 1 mA.
- What is the maximum number of nodes that can be connected using the SN65HVD78D?
The device allows over 200 connected nodes due to low unit-loading.
- What are the common applications of the SN65HVD78D?
The device is commonly used in factory automation, telecommunications infrastructure, and motion control.
- What is the receiver hysteresis of the SN65HVD78D?
The receiver hysteresis is 80 mV for noise rejection.
- Does the SN65HVD78D support half-duplex communication?
Yes, the device supports half-duplex (two-wire bus) communication.
- What are the available package types for the SN65HVD78D?
The device is available in SOIC (8-pin), VSSOP (8-pin), and VSON (8-pin) packages.
