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National Semiconductor Introduces Industry's First Quad Multipoint-LVDS Transceiver.

Transceiver's Smooth Edge Rates Maximize Noise Margin in AdvancedTCA and MicroTCA Backplanes

SANTA CLARA, Calif., May 8 /PRNewswire-FirstCall/ -- National Semiconductor Corp. today introduced the industry's first quad multipoint-low-voltage differential signaling (M-LVDS) transceiver designed for backplane clock distribution in Advanced Telecom and Computing Architecture (ATCA) and MicroTCA line cards. The new quad-channel transceiver is compliant with the EIA/TIA-899 M-LVDS standard. It provides the optimum balance of integration and ease of design to reduce board space and design time in end equipment such as wireless base stations, communications routers and LXI test instruments.

The DS91M040 drives and receives clock and data signals in multipoint network applications supporting up to four networks simultaneously. It can manage as many as 32 loads at clock frequencies up to 125 MHz and data transfers up to 250 Mbps. The transceiver addresses multipoint and multidrop clock and data distribution applications where a common bus connects multiple drivers and receivers.

The transceiver's smooth edges, with 2 nanosecond (ns) typical rise and fall times, minimize signal reflections due to unterminated backplane stubs. A feedback-controlled output provides constant amplitude regardless of whether the backplane is fully loaded or populated with a single card. Both features allow the DS91M040 to deliver the highest noise margin over a wide variety of conditions.

The DS91M040 also includes pin-control of the M-LVDS receiver, which allows designers to enable a receiver failsafe (type 2) or provide no failsafe (type 1) depending on the application. This unique feature reduces a manufacturers' required inventory by eliminating the need to stock two separate transceivers. Additionally, the DS91M040 provides an upgrade path to manufacturers that use RS-485 transceivers.

Technical Features - DS91M040 Quad M-LVDS Transceiver

The DS91M040 provides four half-duplex transceiver channels that accept low-voltage transistor-transistor logic (LVTTL) and low-voltage CMOS (LVCMOS) signals at the driver inputs and converts them to differential M-LVDS signal levels. The receiver accepts low-voltage differential signals -- such as LVDS, Bus-LVDS, M-LVDS, low-voltage positive-emitter-coupled logic (LVPECL) and common-mode logic (CML) -- and converts them to 3V LVCMOS signals. The DS91M040 supports both M-LVDS type 1 and type 2 receiver inputs and shields adjoining circuits with 15 kV of electrostatic discharge (ESD) protection on the M-LVDS input/output (I/O) pins. The separate enable controls for each channel provide designers with maximum flexibility because each channel can serve as a driver or receiver, or may be shut down for lower power consumption. The DS91M040 is offered in a small 5 mm by 5 mm, 32-pin LLP(R) package.

About National's LVDS Portfolio

National Semiconductor's LVDS technology is a low-power, low-noise method for high-speed data transmission over copper interconnects. LVDS solves current and future high-performance data transmission challenges in bandwidth-hungry applications by delivering data at gigabits per second at milliwatts of power. National is the world's largest supplier of high-speed LVDS products, according to Databean's 2007 Analog IC Market Share survey. National's LVDS products include interface line drivers and receivers, LVDS-LVDS signal conditioners, LVDS-LVDS switching/multiplexing/repeating functions, LVDS serializer/deserializers, FPD link display solutions and ADCs with high-speed digital interfaces. For more information on National's LVDS products, visit

Pricing and Availability

Available now, the DS91M040 is priced at $3.79 each in 1,000-unit quantities. For more information on the DS91M040 or to order samples and an evaluation board, visit

About National Semiconductor

National Semiconductor, the industry's premier analog company, creates high-value analog devices and subsystems. National's leading-edge products include power management circuits, display drivers, audio and operational amplifiers, interface products and data conversion solutions. National's key analog markets include wireless handsets, displays, communications infrastructure, medical, automotive, industrial, and test and measurement applications. Headquartered in Santa Clara, Calif., National reported sales of $1.93 billion for fiscal 2007, which ended May 27, 2007. Additional company and product information is available at
 LLP is a registered trademarks of National Semiconductor Corporation.

 Media Contact Reader Information
 Mark Alden Design Support Group
 National Semiconductor (800) 272-9959
 (408) 721-6929 World Wide Web

CONTACT: Media, Mark Alden, +1-408-721-6929,; or Reader Information, Design Support Group, 1-800-272-9959, both of National Semiconductor Corp.

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Publication:PR Newswire
Date:May 8, 2008
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