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TI RS-485 transceivers stretch voltage range

Posted: 28 Apr 2003 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? sn65hvd2x? sn65hvd20? sn65hvd21? sn65hvd22?

A line of RS-485 transceivers from Texas Instruments Inc. offers a common-mode voltage range of -20V to 25V, or more than double the range specified in TIA/EIA-485.

Devices in the SN65HVD2X series are designed for bidirectional data transmission on multipoint twisted-pair cables in factory automation, security networks, building HVAC systems, or other applications where the environment is too harsh for ordinary transceivers.

Some examples include digital motor controllers, remote sensors and terminals, industrial process control, security stations, and environmental control systems. The transceivers can also be used in electrical power inverters, industrial drives and avionics, TI said.

The SN65HVD20 provides a signal rate of up to 25Mbps for interconnecting networks of up to 64 nodes. The SN65HVD21 and SN65HVD22 feature driver slew rate control up to 5Mbps and 500Kbps, respectively, and allow up to 256 connected nodes.

Transceivers in the HVD2x family are said to offer performance exceeding that of typical RS-485 devices. Features include a 1?A maximum standby supply current, bus I/O electrostatic-discharge protection to more than 16kV (HBMl), receiver hysteresis >100mV, and fail-safe operation for open circuit, short circuit, and idle-bus conditions.

Follow-on devices (SN65HVD23 and SN65HVD24) are expected to be among the first to provide receiver equalization technology for improved jitter performance on differential bus applications, with data rates of as much as 25Mbps and 3Mbps at cable lengths that approach 160m and 500m, respectively.

The SN65HVD20, SN65HVD21 and SN65HVD22 are available now in eight-pin packaging, at $1.93 in quantities of 1,000.

EE Times

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