National Semiconductor's Dual Mux-Buffer with Integrated Equalizer Delivers Industry's Best Signal Integrity

NationalSemiconductor Corporation, a leading supplier of high-speedinterface devices, today introduced a signal conditioning and repeatingproduct that extends the reach of high-speed switch, router, storage areanetwork (SAN) and server backplanes. The DS40MB200 can also be used as aredundancy switch in backplanes, and can extend the reach of PCI expressconnectivity in PCs, security systems and professional video applications. The DS40MB200 is a dual 1:2 and 2:1 multiplexer with integrated equalizerson every input, configurable pre-emphasis on every output and up to 4 Gbps ofserial I/O performance, providing the lowest jitter and longest cable reach inthe industry. In many applications, cost-effective backplanes and cablesrequire equalization and boost to ensure reliable data transfer between thesource and destination. The DS40MB200 is optimized for error-freetransmission on more than 80 inches of FR4 backplanes or up to 15 meters oflow-cost cables. "Similar products on the market today can't reach the level of jitterperformance, pre-emphasis boost or edge rates that National's DS40MB200provides," said Jeff Waters, product line director for NationalSemiconductor's Interface Division. "With National's DS40MB200, our customerscan dramatically reduce signal integrity problems when driving signals off-board over long data transmission lines or inexpensive cables." The DS40MB200 easily attaches to a field programmable gate-array (FPGA) orapplication-specific integrated circuit (ASIC) to provide signal pathredundancy, signal buffering and improved serial I/O performance on low-costinterconnects. It features six kilovolts of ESD (electrostatic discharge)immunity. The high-speed serial inputs feature an integrated receiveequalizer to compensate for input transmission line loss. Technical Features of the DS40MB200 Multiplexer/Buffer The DS40MB200's high-speed serial inputs feature an integrated equalizer,the outputs feature configurable pre-emphasis, and the input stages have afixed-equalizer to reduce ISI (inter-symbol interference) distortion fromboard traces. The multiplexer/buffer compensates for up to 5 dB oftransmission loss. Each output drive has four configurable steps of pre-emphasis to compensate against transmission losses from long FR4 backplanes.The pre-emphasis levels can be independently controlled for the line-side andswitch-side drivers. The outputs buffer and condition the signal so that thelower and higher frequencies reach similar amplitudes at the end of thebackplane and minimize deterministic jitter. The two independent channels each contain a transmitter with a fan-out oftwo and a receiver with a 2:1 input multiplexer. The multiplexers can beconfigured to handle system redundancy requirements from the line card to thecontroller card. They also can be configured to provide a loop-back functionthrough the device for either device-level or system-level testing. Theinternal loop-back paths from switch-side input to switch-side output enableat-speed testing. All receiver inputs and driver outputs are terminatedinternally utilizing terminating resistors on-chip. The inputs are compatibleto AC-coupled LVDS (low voltage differential signaling), LVPECL (low voltagepositive emitter coupled logic) and CML (common mode logic). For more information on the DS40MB200, to order samples and an evaluationboard, or to download an application note, visithttp://www.national.com/pf/DS/DS40MB200.html . An on-demand online seminar,"Boosting FPGA and CPLD Interface Performance for Off-board DataTransmission," is available for viewing athttp://www.national.com/onlineseminar/2005/interface/interface.html . National's Interface Products National Semiconductor, the LVDS technology innovator and market leader,offers a wide range of interconnect solutions that transfer high-speed digitalsignals using world-class analog technology. These solutions help systemdesigners develop high-performance applications in a variety of markets,including communication and industrial systems. The products feature highreliability, low power and low noise, as well as dramatic systems savings incable and connector costs. National Semiconductor is the world's largestsupplier of high-speed LVDS products, according to Databean's 2005 Analog ICMarket Share survey. For more information on National's interface products,visit http://www.national.com/appinfo/interface/ . Pricing and Availability Available now and packaged in a 48-pin LLP(R), the DS40MB200 is priced at$17.40 in 1,000-unit quantities. About National Semiconductor National Semiconductor, the industry's premier analog company, createshigh-value analog devices and subsystems. National's leading-edge productsinclude power management circuits, display drivers, audio and operationalamplifiers, communication interface products and data conversion solutions.National's key markets include wireless handsets, displays and a variety ofbroad electronics markets, including medical, automotive, industrial, and testand measurement applications. Headquartered in Santa Clara, California,National reported sales of $1.91 billion for fiscal 2005, which ended May 29,2005. Additional company and product information is available athttp://www.national.com. NOTE: National Semiconductor and LLP are registered trademarks ofNational Semiconductor Corporation. Media Information Gayle Bullock 1-408-721-2033 gayle.bullock@nsc.com Reader Information Design Support Group 800-272-9959 http://www.national.com

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