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TI releases M-LVDS line circuits for multipoint data buses

Posted: 31 Jan 2002 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? ti? driver ic? controller ic? line driver?

The SN65MLVD20x series of multipoint-LVDS (M-LVDS) line circuits provides up to 200Mbps LVDS speeds between up to 32 devices over typical distances of 30m. The devices provide low-power and low-noise solutions for high-speed backplanes and cable transmissions of multipoint data buses such as those found in industrial process controls, automobiles, RAIDs, LANs, data libraries, and computers.

The devices are claimed to be the industry's first family of single line transceivers, drivers and receivers that are compliant with the soon-to-be-published TIA/EIA-899 specification for M-LVDS.

Differential signaling provides for lower radiated EM emissions and susceptibility over widely used single-ended technologies such as BTL or GTL. The lower operating voltages provide higher speeds and lower power over 5V-based differential technologies such as RS-485 and RS-422.

SN65MLVD20x drivers can drive 30-ohm loads at 200Mbps while drawing only 19mA from a 3.3V supply and 63mW of power. Controlled output voltage transitions minimize the transmission line effects of stubs and other discontinuities along the transmission path. The devices also include features that allow for bus contention, live insertion, and other events common to multipoint bus applications.

The receivers feature a wide common-mode input voltage range of -1V to 3.4V and permit data transfers with a minimum 11V of ground noise. They draw 11mA at 200Mbps from a 3.3V supply. They also offer two differential input voltage thresholds. For the maximum SNR, Type-1 receivers detect differential voltages of as little as 50mV. Type-2 receivers feature an input threshold offset by 100mV that provides a known output with no input signal present.

The first series of M-LVDS products duplicate industry-standard footprints of the SN75176 transceiver and SN75ALS180 driver and receiver, with other footprints currently in development.

The 100Mbps SN65MLVD200 is priced at $2.52 while the 200Mbps SN65MLVD201 is priced at $3. Both are housed in SOIC-8 packages and operate at half-duplex with a differential threshold voltage centered at 0V.

The 100Mbps SN65MLVD202 is quoted at $2.63 and the 200Mbps SN65MLVD203 is quoted at $3.10, with both devices housed in SOIC-14 and operate at full-duplex and a differential threshold voltage centered at 0V.

The half-duplex SN65MLVD204 is available in SOIC-8 and quoted at $2.52. The full-duplex SN65MLVD205 is available in SOIC-14 and quoted at $2.63. Both devices operate at 100Mbps and have a differential threshold voltage centered at 100mV.

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