SN65HVD1477D

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The SN65HVD1477D is an RS-485 transceiver chip from Texas Instruments. It is a low-power, high-speed transceiver that is designed to meet the 21 Mbps data rate in point-to-point and multi-point bus control environments. It is mainly used in industrial control systems such as PLCs and motor drives, where signal speeds and signal integrity are critical.

The SN65HVD1477D is specifically designed for use with RS-485 buses in differential mode. The SN65HVD1477D contains two differential drivers, two differential receivers, and a galvanic isolator. The two drivers are capable of providing up to 11 mA of output current with a typical slew rate of 10 V/µs. The two receivers have a maximum input voltage range of ±20V and an input impedance of 300Ω. The galvanic isolator provides a high level of protection from ground loop and transient voltages, protecting both the driver and receiver circuitry.

The SN65HVD1477D enables robust communication across long bus cables, providing excellent signal integrity. The transmit and receive outputs are differential to minimize the effect of common mode noise from adjacent cables, and the on-chip termination resistors ensure optimal signal integrity. The integrated EMI filter attenuates the high frequency signals that could otherwise lead to erroneous communication.

The SN65HVD1477D has a number of features that enable it to operate in harsh industrial environments. It has an on-chip wide-temperature range operation, allowing it to maintain performance up to 130°C. It also has an integrated ESD protection circuit which increases the part’s robustness against electro-static discharge events. In addition, it has an integrated power-good indicator to indicate if the part is operating correctly.

In summary, the SN65HVD1477D is an integrated RS-485 transceiver that provides a robust and reliable communication link for point-to-point and multi-point bus control systems. Its differential drivers and receivers ensure excellent signal integrity even when used over long bus cables. Its integrated EMI filter and on-chip termination resistors help to minimize interference from external sources. Its wide-temperature range operation and robust ESD protection circuit make it an excellent choice for harsh industrial environments.

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