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Dual mux-buffer boosts signal integrity

Santa Clara, Calif. — National Semiconductor Corp.'s dual multiplexer/buffer with integrated equalizers, programmable pre-emphasis, and up to 4 Gbits/s of serial I/O performance, are said to provide the lowest jitter and longest cable reach in the industry.

The 1:2 and 2:1 multiplexer, with integrated equalizers on every input, and configurable pre-emphasis on every output, are signal conditioning and repeating products that can extend the reach of high-speed switch, router, storage area network (SAN) and server backplanes, said Jeff Waters, product line director for National Semiconductor's Interface Division.

The DS40MB200 can also be used as a redundancy switch in backplanes, and can extend the reach of PCI express connectivity in PCs, security systems and professional video applications, Waters said.

The DS40MB200 is optimized for error-free transmission on more than 80 inches of FR4 backplanes or up to 15 meters of low-cost cables.

“Similar products on the market today can't reach the level of jitter performance, pre-emphasis boost or edge rates that National's DS40MB200 provides,” Waters said. “With National's DS40MB200, our customers can dramatically reduce signal integrity problems when driving signals off-board over long data transmission lines or inexpensive cables.”

The DS40MB200 attaches to a field programmable gate-array (FPGA) or application-specific integrated circuit (ASIC) to provide signal path redundancy, signal buffering and improved serial I/O performance on low-cost interconnects. It features six kV of electrostatic discharge (ESD) immunity. The high-speed serial inputs features an integrated receive equalizer to compensate for input transmission line loss.

The DS40MB200's high-speed serial inputs feature an integrated equalizer, the outputs feature configurable pre-emphasis, and the input stages have a fixed-equalizer to reduce inter-symbol interference (ISI) distortion from board traces. The multiplexer/buffer compensates for up to 5 dB of transmission loss.
The two independent channels each contain a transmitter with a fan-out of two and a receiver with a 2:1 input multiplexer.

All receiver inputs and driver outputs are terminated internally utilizing terminating resistors on-chip. The inputs are compatible to AC-coupled low-voltage differential signaling (LVDS), low-voltage positive emitter coupled logic (LVPECL), and common mode logic (CML).

Available now and packaged in a 48-pin LLP , the DS40MB200 is priced at $17.40 in 1,000-unit quantities.Click here for the DS40MB200 data sheet.

National Semiconductor , 1-800-272-9959, www.National.com.

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