Overview
The SN65HVD78DRBR, produced by Texas Instruments, is a 3.3-V half-duplex RS-485 transceiver designed for demanding industrial applications. This device combines a differential driver and a differential receiver, operating from a single 3.3-V power supply. It is suitable for multi-point applications over long cable runs due to its wide common-mode voltage range. The transceiver features robust bus pins with high levels of protection against ESD events, adhering to Human-Body Model and IEC Contact Discharge specifications. It is characterized over an extended industrial temperature range of –40°C to 125°C, making it versatile for various industrial environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | VSON (DRB) | - |
| Pins | 8 | - |
| Operating Temperature Range | –40 to 125 | °C |
| Supply Voltage | 3.0 to 3.6 | V |
| Signaling Rate Options | 250 kbps, 20 Mbps, 50 Mbps | - |
| Bus Input Current (disabled driver) | 240 µA (VI = 12 V), –267 µA (VI = –7 V) | µA |
| Supply Current (quiescent) | 750 µA (driver and receiver enabled) | µA |
| Driver Differential Output Rise/Fall Time | 1 to 3 ns (RL = 54 Ω, CL = 50 pF) | ns |
| Receiver Propagation Delay Time | 75 to 100 ns | ns |
Key Features
- Small-size VSSOP and VSON packages to save board space, or SOIC for drop-in compatibility.
- Bus I/O protection with >±15 kV HBM protection, >±12 kV IEC 61000-4-2 contact discharge, and >±4 kV IEC 61000-4-4 fast transient burst.
- Extended industrial temperature range of –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 ICC < 1 mA quiescent during operation.
- 5-V tolerant logic inputs compatible with 3.3-V or 5-V controllers.
- Glitch-free power-up and power-down bus inputs and outputs.
Applications
- Factory Automation
- Telecommunications Infrastructure
- Motion Control
The SN65HVD78DRBR is well-suited for various industrial and communication applications where robust and reliable data transmission is critical.
Q & A
- What is the operating temperature range of the SN65HVD78DRBR?
The operating temperature range is –40°C to 125°C.
- What are the signaling rate options for the SN65HVD78DRBR?
The signaling rate options are 250 kbps, 20 Mbps, and 50 Mbps.
- What is the supply voltage range for the SN65HVD78DRBR?
The supply voltage range is 3.0 to 3.6 V.
- What kind of ESD protection does the SN65HVD78DRBR offer?
The device offers >±15 kV HBM protection, >±12 kV IEC 61000-4-2 contact discharge, and >±4 kV IEC 61000-4-4 fast transient burst.
- How many nodes can be connected using the SN65HVD78DRBR?
The device allows over 200 connected nodes due to its low unit-loading.
- Is the SN65HVD78DRBR 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 SN65HVD78DRBR?
The typical quiescent supply current is less than 1 mA.
- Does the SN65HVD78DRBR support glitch-free power-up and power-down?
Yes, the device supports glitch-free power-up and power-down bus inputs and outputs.
- What are the common applications of the SN65HVD78DRBR?
The device is commonly used in factory automation, telecommunications infrastructure, and motion control.
- What package options are available for the SN65HVD78DRBR?
The device is available in VSSOP, SOIC, and VSON packages.
