SN65HVD3082EDR IC

Technical Specifications of SN65HVD3082EDR

Datasheet	SN65HVD3082EDR datasheet
Category	Integrated Circuits (ICs)
Family	Interface – Drivers, Receivers, Transceivers
Manufacturer	Texas Instruments
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Receiver Hysteresis	30mV
Data Rate	200kbps
Voltage – Supply	4.5 V ~ 5.5 V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package	8-SOIC

SN65HVD3082EDR Description

The SNx5HVD308xE transceivers can be used in RS-485 data bus networks that work in half-duplex mode. They work with 5V power and are compatible with TIA/EIA-485A. Because the transition times between states are controlled, these devices are good for sending data over long twisted-pair lines. Both the SN65HVD3082E and the SN75HVD3082E are great for speeds of up to 200 kbps. The SN65HVD3085E is good for applications that need signaling rates of up to 1 Mbps. The SN65HVD3088E, on the other hand, can handle signaling rates of up to 20 Mbps.

Even without a load, these parts can work with as little as 0.3 mA of supply power. Because their supply current drops to a few nanoamps when they are not being used, these devices are great for uses that are very power-conscious. Due to their high ESD protection levels and wide common-mode range, these components work well in noise-sensitive applications like telecom rack interconnects, cabled chassis interconnects, and industrial automation networks.

The SN75176, which is used a lot, has the same size as these devices. The power-on-reset circuits keep the outputs in a high-impedance state until the source voltage is stable. If there is a problem with the system, the device won’t break because of the thermal stop feature. The SN75HVD3082E can be used in temperatures from 0 to 70 degrees Celsius, while the SN65HVD308xE can be used in temperatures from -40 degrees Celsius to 85 degrees Celsius. It has been found that the D package of the SN65HVD3082E can work in temperatures from -40 degrees Celsius to 105 degrees Celsius.

SN65HVD3082EDR Feature Description

For open-circuit, bus-idle, or short-circuit fail-safe situations, the SNx5HVD308xE sets the receiver input limits with an internal bias. A usual hysteresis of 30 mV has been built into the design to help it deal with noise better. The Human Body Model (HBM) is used to protect the transceiver bus ports from electrostatic discharges that are less than 15 kilovolts.

The devices have a feature called “thermal shutdown” that turns them off when it gets too hot, so they don’t get damaged by working in hot places. At a temperature of 165 degrees Celsius (nominal), the thermal shutdown mode is turned on. This lets the device switch to a low-power state with high-impedance outputs.

SN65HVD3082EDR Features

• 1/8: A bus can hold up to 256 units.
• Up to 15 kV ESD safety for bus pins
• The SN75176 shape is an industry standard.
• Fail-safe receiver (open bus, short bus, and idle bus).
• Power-up and power-down bus inputs and outputs that don’t make any noise.

Pin Configuration and Functions

The 8SOIC half-duplex transceiver, IC SN65HVD3082EDR, is used to send and receive data over a single twisted-pair wire in both directions. It has eight pins in its arrangement. Pin 1, which is marked Vcc, is connected to the positive supply voltage. This gives the IC power within the range of voltages that were defined. The twisted pair wire sends data signals to pins 2 and 3, which are called RSIN1 and RSIN2.

Pins 7 and 6, which are called RSOUT1 and RSOUT2, are the receiver output pins. They sent the data signals that were received. Pin 4, which is marked RE/DE, is the receiver enable/driver enable control pin. It lets you switch between the send and receive modes. Pin 5, DI/RO, is used to send data when the mode is set to send, and it sends data when the mode is set to receive. Lastly, GND, pin 8, is the link to the ground. With these pins and the functions that go with them, the SN65HVD3082EDR can provide reliable half-duplex communication in apps like industrial automation and car systems.

Parameter Measurement Information

Test load capacitance includes both probe and jig capacitance (unless otherwise stated). Signal generator features include rise and fall times of less than 6 ns, a 100 kHz pulse rate, and a 50% duty cycle. ZO = 50 (unless stated differently).

Power Supply Recommendations

To make sure each supply works reliably at all data rates and supply voltages, a 100-nF ceramic capacitor must be placed as close to the supply pins as possible. This makes up for the resistance and inductance of the PCB power planes and helps to reduce the source voltage ripple on the outputs of switched-mode power supplies.

Application Information

The SNx5HVD308xE devices are half-duplex RS-485 transceivers that are often used for sending data in an asynchronous way. Different working modes can be set up with the driver and receiver enable pins. Using separate enable lines gives you the most power because you can turn on and off both the driver and the receiver separately.

Even though this setup needs two control lines, it lets you listen to the bus activity selectively, whether the driver is sending data or not. By combining the enable signals into a single direction-control signal, the interface to the device can be made simpler. When the direction-control line is high, the transmitter works as a driver. When the direction-control line is low, it works as a receiver. Also, if you connect the receiver-enable input to ground and only handle the driver-enable input, you only need one line. In this setup, a node gets both the data from the bus and the data it sends, so it can check that the right data has been sent.

SN65HVD3082EDR Typical Application

An RS-485 bus is comprised of multiple transceivers connected in parallel to a bus cable. The characteristic impedance, Z0, of a cable is matched by the value of the termination resistor, RT, at each end. Line reflections are prevented. This technique, known as parallel termination, allows for greater data rates to function over longer cable lengths.

Layout

• Layout Guidelines

In order to protect against EFT and surge transients that can happen in industrial settings, it is sometimes necessary to build reliable bus nodes with external transient protection devices. Due to the wide frequency range of transients (about 3 MHz to 3 GHz), high-frequency layout methods must be used when designing PCBs.

• Put the protection circuits near the bus connector to stop noise spikes from getting into the board.
• Make sure the protection parts go in the same direction as the signal. Don’t push the transient currents to go around the signal path to get to the protection device.
• Place bypass capacitors between 100 nF and 220 nF as close as you can to the VCC pins of the transceiver, UART, and driver ICs on the board.
• Use at least two vias to connect bypass capacitors and protection devices to VCC and ground. This will reduce the amount of useful via-inductance.
• Use pullup or pulldown resistors with values between 1 k and 10 k on enable lines to reduce the amount of noise current in these lines during transient events.
• Connect pulse-proof resistors in series to the A and B bus lines if the TVS limiting voltage is higher than the maximum voltage of the transceiver bus pins. These resistors stop the transceiver from latching up by limiting the amount of leftover clamping current that flows into it.

Conclusion

In conclusion, the SN65HVD3082EDR transceivers allow RS-485 data bus networks to communicate in a strong and efficient way. With a wide range of features like high ESD protection, fail-safe operation, and a design that saves power, these transceivers are great for a wide range of uses, ensuring that data is sent reliably and that the best performance is reached even in tough environments.

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