Overview
The SN65HVD78DRBT is a low-power, half-duplex RS-485 transceiver produced by Texas Instruments. This device is part of the SN65HVD7x family, which is designed for demanding industrial applications. It operates from a single 3.3-V power supply and features robust drivers and receivers in small packages, making it ideal for space-constrained designs. The transceiver supports data transmission rates up to 50 Mbps and is characterized over a wide ambient temperature range from –40°C to 125°C.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 3 | 3.6 | V | ||
| Signaling Rate | 50 Mbps | ||||
| Driver Differential Output Rise/Fall Time | RL = 54 Ω, CL = 50 pF | 1 | 3 | 6 | ns |
| Driver Propagation Delay | 0.7 | 1 | µs | ||
| Receiver Output Rise/Fall Time | CL = 15 pF | 5 | 10 | ns | |
| Receiver Propagation Delay | 60 | 70 | ns | ||
| Supply Current (Quiescent) | Driver and receiver enabled, no load | 750 | 950 | µA | |
| Standby Supply Current | Driver and receiver disabled | < 2 | µA | ||
| ESD Protection | ±15 kV HBM, ±12 kV IEC 61000-4-2, ±4 kV IEC 61000-4-4 | ||||
| Operating Temperature Range | –40°C | 125°C | |||
| Package Types | SOIC (8), VSSOP (8), VSON (8) |
Key Features
- Small-size VSSOP packages save board space, or SOIC for drop-in compatibility.
- Bus I/O protection with ±15 kV HBM, ±12 kV IEC 61000-4-2 contact discharge, and ±4 kV IEC 61000-4-4 fast transient burst.
- Extended industrial temperature range from –40°C to 125°C.
- Large receiver hysteresis (80 mV) for noise rejection.
- Low unit-loading allows over 200 connected nodes.
- Low power consumption with low standby supply current (< 2 µA) and quiescent supply current (< 1 mA).
- 5-V tolerant logic inputs compatible with 3.3-V or 5-V controllers.
- Signaling rate options optimized for 250 kbps, 20 Mbps, and 50 Mbps.
- Glitch-free power-up and power-down bus inputs and outputs.
Applications
- Factory Automation
- Telecommunications Infrastructure
- Motion Control
Q & A
- What is the maximum signaling rate of the SN65HVD78DRBT? The maximum signaling rate is 50 Mbps.
- What are the package options available for the SN65HVD78DRBT? The device is available in SOIC (8), VSSOP (8), and VSON (8) packages.
- What is the operating temperature range of the SN65HVD78DRBT? The operating temperature range is from –40°C to 125°C.
- How much ESD protection does the SN65HVD78DRBT offer? The device offers ±15 kV HBM, ±12 kV IEC 61000-4-2 contact discharge, and ±4 kV IEC 61000-4-4 fast transient burst ESD protection.
- What is the standby supply current of the SN65HVD78DRBT? The standby supply current is less than 2 µA when both the driver and receiver are disabled.
- Is the SN65HVD78DRBT compatible with 5-V logic inputs? Yes, the device has 5-V tolerant logic inputs compatible with 3.3-V or 5-V controllers.
- How many nodes can be connected using the SN65HVD78DRBT? The device allows over 200 connected nodes due to its low unit-loading.
- What are the key features of the receiver in the SN65HVD78DRBT? The receiver features large hysteresis (80 mV) for noise rejection and glitch-free power-up and power-down bus inputs and outputs.
- What are some typical applications of the SN65HVD78DRBT? Typical applications include factory automation, telecommunications infrastructure, and motion control.
- How does the SN65HVD78DRBT handle power-up and power-down? The device features glitch-free power-up and power-down bus inputs and outputs.
