Overview
The SN65HVD70DR is a 3.3-V full-duplex RS-485 transceiver produced by Texas Instruments. This device is designed to operate in harsh environments and offers high levels of ESD protection, including > ±30-kV HBM and > ±12-kV IEC61000-4-2 contact discharge. It combines a differential driver and a differential receiver, enabling full-duplex bus communication from a single 3.3-V power supply. The transceiver is available in a 14-pin SOIC package and is characterized over a wide temperature range from –40°C to 125°C, ensuring reliability in various operating conditions.
Key Specifications
| Parameter | Description |
|---|---|
| Supply Voltage | 3.3 V |
| Data Rate | Up to 400 kbps |
| Package Type | SOIC-14 |
| Package Dimensions | 8.65 mm × 3.91 mm |
| Operating Temperature | –40°C to 125°C |
| ESD Protection | > ±30-kV HBM, > ±12-kV IEC61000-4-2 contact discharge |
| Driver Enable | Active-high driver enable and active-low receiver enable |
| Standby Current | < 5 µA when both driver and receiver are disabled |
Key Features
- Full-duplex operation with separate input and output pins for driver and receiver.
- High ESD protection levels: > ±30-kV HBM and > ±12-kV IEC61000-4-2 contact discharge.
- Wide common-mode voltage range, making it suitable for multi-point applications over long cable runs.
- Large receiver hysteresis for immunity to conducted differential noise.
- Active-high driver enable and active-low receiver enable with internal pull-down and pull-up resistors.
- Low standby current of less than 5 µA when both driver and receiver are disabled.
Applications
The SN65HVD70DR is suitable for various industrial and commercial applications that require reliable RS-485 communication. These include:
- Industrial automation and control systems.
- Building automation and HVAC systems.
- Point-of-sale terminals and other commercial equipment.
- Remote sensors and data acquisition systems.
- Multi-point bus communication systems over long cable runs.
Q & A
- What is the operating voltage of the SN65HVD70DR?
The SN65HVD70DR operates from a single 3.3-V power supply.
- What is the maximum data rate supported by the SN65HVD70DR?
The device supports data rates up to 400 kbps.
- What type of package is the SN65HVD70DR available in?
The SN65HVD70DR is available in a 14-pin SOIC package.
- What are the operating temperature ranges for the SN65HVD70DR?
The device operates over a temperature range from –40°C to 125°C.
- What level of ESD protection does the SN65HVD70DR offer?
The device offers > ±30-kV HBM and > ±12-kV IEC61000-4-2 contact discharge ESD protection.
- How do you enable or disable the driver and receiver in the SN65HVD70DR?
The driver is enabled with an active-high driver enable pin (DE), and the receiver is enabled with an active-low receiver enable pin.
- What is the standby current when both the driver and receiver are disabled?
The standby current is less than 5 µA when both the driver and receiver are disabled.
- Is the SN65HVD70DR suitable for multi-point applications?
Yes, the device is suitable for multi-point applications due to its wide common-mode voltage range.
- What kind of noise immunity does the SN65HVD70DR offer?
The device offers immunity to conducted differential noise due to its large receiver hysteresis.
- Are there internal pull-up or pull-down resistors on the enable pins?
Yes, the driver enable pin has an internal pull-down resistor, and the data input pin has an internal pull-up resistor.
