RS-485 Transceiver With Fastest Auto Polarity Correction
Texas Instruments today introduced a low-power, half-duplex RS-485 transceiver with the fastest automatic bus-polarity correction time. In many industrial applications, such as e-metering networks, DMX512 networks, industrial automation, HVAC systems and process control, it is easy to connect wires incorrectly, which can cause system failure. For large networks, miswiring without quick correction can cause productiondelays, resulting in significant revenue loss. When hot-plugged, the SN65HVD888 provides cross-wire immunity 80 percent faster than the competition, detecting and correcting the bus polarity within 76 milliseconds of bus idling.
The SN65HVD888 is available in a standard 8-pin SOIC package, which eliminates the need for board redesign while providing a robust, reliable upgrade to a standard RS-485 device. In addition, the SN65HVD888 supports up to 256 nodes on the bus, eliminating the need for repeaters.
Key features and benefits of the SN65HVD888
Better electrostatic discharge (ESD)/electrical fast transients (EFT) performance: At +/-12 kV IEC61000-4-2 contact discharge and +4 kV IEC61000-4-4 fast transient burst, it is more reliable than competing devices in noisyenvironments.
Highest transient immunity: Large receiver hysteresis at 60 mV is 15-percent higher than the nearest competitor, providing better immunity to noise on the bus lines.
Fastest correction time: Correcting polarity 80 percent faster than the closest competing device ensures the system is functioning properly in the shortest possible time.
Lowest power consumption: An optimized combination of low quiescent and standby supply currents makes the device suitable for battery-powered applications.
Tools and support
The RS-485 half-duplex evaluation moduleis available to evaluate device performance, to support fast development and analysis of data transmission systems using the SN65HVD888. It can be ordered today for US$49.
Support is available on the Industrial Interface Forum in the TI E2E™ Community, where engineers can ask questions and get answers from TI experts.
Availability, packaging and pricing
The SN65HVD888 is available in a standard 8-pin SOIC package. Suggested retail pricing in 1,000-unit quantities starts at US$1.10.
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