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Home » NEWEST Products » New by Manufacturer » Texas Instruments » SN65HVD7x 3.3V-Supply RS-485 Interface ICs - TI
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Texas Instruments SN65HVD7x 3.3V-Supply RS-485 Interface ICs with IEC ESD Protection

TI SN65HVD7x 3.3V-Supply RS-485 Interface ICs

Texas Instruments SN65HVD7x 3.3V-Supply RS-485 Interface ICs with IEC ESD Protection have robust 3.3V drivers and receivers in a small package for demanding industrial applications. The bus pins of these TI devices are robust to ESD events with high levels of protection to Human-Body Model and IEC Contact Discharge specifications. TI SN65HVD78, SN65HVD75, and SN65HVD72 each combine a differential driver and a differential receiver that operate from a single 3.3V power supply. The driver differential outputs and the receiver differential inputs are connected internally to form a bus port suitable for half-duplex (two-wire bus) communication. These TI interface ICs feature a wide common-mode voltage range, making the devices suitable for multi-point applications over long cable runs. SN65HVD7x devices are characterized from -40°C to 125°C.

  • Bus I/O Protection
    • > ±15kV HBM protection
    • > ±12kV IEC61000-4-2 Contact Discharge
    • > ±12kV IEC61000-4-2 Air-Gap Discharge
  • Extended Industrial Temperature Range: -40°C to 125°C
  • Large Receiver Hysteresis (80mV) for Noise Rejection
  • Low Unit-loading allows over 200 connected nodes
  • Low Power Consumption
    • Low Standby Supply Current: <2µA
    • ICC <1mA Quiescent During Operation
  • 5V Tolerant Logic Inputs Compatible With 3.3V or 5V Controllers
  • Signaling Rate Options Optimized for: 250 kbps, 20 Mbps, 50 Mbps
  • Factory Automation
  • Telecomm Infrastructure
  • Motion Control

Part Number Signaling Rate Cable Length (m)
SN65HVD72 Up to 250kbps Up to 2000
SN65HVD75 Up to 20 Mbps Up to 100
SN65HVD78 Up to 50Mbps Up to 50

Logic Diagram (Positive Logic)
Logic Diagram (Positive Logic)
Texas Instruments SN65HVD72EVM Evaluation Module

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Additional Resources
User's Guide

Texas Instruments SN65HVD72EVM evaluation module helps designers evaluate the device performance, supporting fast development, and analysis of data transmission systems using the SN65HVD72 / SN65HVD75 / SN65HVD78 transceivers. This TI EVM board comes with the SN65HVD75 (20Mbps) device soldered to the board. The EVM kit includes an IC sample pack with the SN65HVD72 (250kbps) and the SN65HVD78 (50Mbps) device. Either device can be evaluated by replacing the SN65HVD75 with the desired speed grade device.

  • The EVM allows for the quick, easy, and accurate evaluation of TI's HVD7x family of RS-485 products
    • Hardware: SN65HVD7X EVM PWB
  • Screw-type SMA jacks and Bergstik headers serve as the I/O connections
  • Banana jacks serve as the DC power input terminals

The bus terminals of the SN65HVD7x transceiver family possess on-chip ESD protection against ±15kV human body model (HBM) and ±12kV IEC61000-4-2 contact discharge. The IEC-ESD test is far more severe than the HBM-ESD test. The 50% higher charge capacitance, CS, and 78% lower discharge resistance, RD of the IECmodel produce significantly higher discharge currents than the HBM-model.

While the implementation of IEC-ESD protection on-chip increases the robustness of portable equipment significantly, it is certainly insufficient to protect a transceiver against the high-energy battering from electrical fast transients (EFT) pulse trains and surge transients, no matter how small the transient voltage and surge transients. In the case of a sequence of electrical fast transients, also known as pulse train, the constant bombardment of these transients does not allow the internal protection circuits to recover. The electrical energy of a transient that is dumped onto the transceiver's internal protections cells is converted into thermal energy, or heat that literally fries the protection cells, thus destroying the transceiver.

It is obvious that even a 15kV IEC-ESD protection circuit will barely survive a single, 1kV EFT pulse, let alone a 4kV EFT pulse-train, which has risen to the standard requirement in many industrial automation and e-metering applications. In order to protect bus nodes against high-energy transients, the implementation of external transient protection devices is therefore necessary. The figure below suggests a design providing protection against light and heavy surge transients, in addition to ESD and EFT transients. It provides surge protection of ≥ 500V transients only, while the right protection circuits can withstand surge transients of 5kV.

SN65HVD72D CRCW060310R0JNEAHP CDSOT23-SM712 TBU-CA065-200-WH MOV-10D201K
  • Texas Instruments