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TI line drivers provide high performance

Posted: 07 Oct 2004 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? ti? multipoint-lvds? m-lvds? advancedtca?

TI line drivers provide high performance

Texas Instruments Inc. (TI) introduced what it claims as the industry's first multipoint-LVDS (M-LVDS) line drivers for clock distribution, providing high performance for heavily-loaded backplanes.

Providing a drive current of 11.3mA with edge rate control, the new products are compliant with the M-LVDS specification TIA/EIA-899, and are suitable for a wide range of high-speed, inter- and intra-system communications, including wireless base station backplanes, AdvancedTCA (Advanced Telecom Computing Architecture) clock buses, network switches and routers.

"The rapid expansion of telecommunications and data communications demands transmission systems with ever greater capacity and speeds at reduced power," stated David Mulcahy, TI's interface product marketing engineer. "The MLVD128/129/047 can be used for many common telecommunications frequencies and support robust, scalable clock management in next-generation network infrastructure equipment."

The SN65MLVD128 and SN65MLVD129 offer a space and cost-saving alternative to typical methods that involve two separate devices for fanout and LVTTL to differential signal conversion. In addition, the higher output levels and lower input thresholds of the M-LVDS provide more than twice the noise margin of typical LVDS-compliant devices.

The MLVD128 and MLVD129 are 30-ohm to 50-ohm line drivers providing low-voltage differential signaling for clock frequencies up to 125MHz. According to TI, the MLVD128 1:8 fanout buffer and MLVD129 dual 1:4 device provide robust solutions for repeating a single-ended source clock differentially with low power and low EMI.

The SN65MLVD128 features an LVTTL receiver and eight line drivers configured as an 8-port M-LVDS repeater, while the MLVD129 has two LVTTL receivers and eight line drivers configured as dual 4-port M-LVDS repeaters. These line drivers have a bus pin electrostatic discharge (ESD) protection that exceeds 9kV.

The MLVD047 is a quadruple M-LVDS line driver for 30-ohm to 55-ohm loads and data rates up to 200Mbps or clock frequencies up to 100MHz. Supporting multipoint bus architectures, this product operates from a single 3.3V supply and is characterized for operation from -40C to 85C.

The M-LVDS standard

M-LVDS is the only LVDS standard for use on buses that provides the controlled edge rates, increased drive strength, improved thresholds and contention provisions that enable the flexible distributed clock distribution scheme specified by the AdvancedTCA specification of the PCI Industrial Computer Manufacturers Group, the company explained.

The SN65MLVD128, SN65MLVD129 and SN65MLVD047 are available in volume quantities from TI and its authorized distributors. The MLVD128 and MLVD129 are packaged in 48-pin TSSOP, and the SN65MLVD047 is available in 16-pin SOIC or 16-pin TSSOP. Suggested resale pricing in 1,000-piece quantities is $3.80 each for the MLVD128 and MLVD129, and $1.45 each for the MLVD047.

To order samples or to download TI's LVDS Application and Data Handbook, visit the company's website.

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