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Dual multiplexer-buffers tout lowest jitter

Santa Clara, Calif.&#8212National Semiconductor's
DS15MB200, SCAN15MB200, and DS08MB200 tout the lowest jitter performance of any dual multiplexer-buffer in the industry&#8212 18 picoseconds&#8212for low-voltage differential signaling (LVDS) interfaces.

These devices can manage redundant differential data streams at speeds up to 1.5 gigabits per second (Gbps) per channel. Each half of the device provides a 1:2 buffer and a 2:1 multiplexer for duplicating one signal into two output streams or selecting from two alternate input data sources. The multiplexers' LVDS capability suit them for conditioning signals from low-cost field-programmable gate arrays (FPGAs) and application-specific integrated circuits (ASICs), which typically do not have high-performance output drivers. In that context, the multiplexers can drive both data and clock signals over a longer distance, according to the company, and so designers can use lower-cost cables and connectors. With their small LLP package, the multiplexers can also be placed closer to the ASIC or FPGA connector to optimize signal integrity.



The outputs of the DS15MB200 and SCAN15MB200, each capable of 1.5 Gbps per channel, have configurable (high-frequency) pre-emphasis with a separate control for each output to compensate for lossy (inexpensive) backplanes or cables. In addition, the SCAN15MB200 supports IEEE 1149.1 (JTAG) and 1149.6 test features to verify connections and test the high-speed data paths. The third multiplexer-buffer, the DS08MB200, manages data rates up to 800 Mbps (no pre-emphasis or 1149.1 support). All three devices integrate 100-ohm input and output termination that improves signal integrity by terminating the backplane or cable as close to the input/output as possible.

Click here for the DS15MB200, here for the SCAN15MB200, and here for the DS08MB200. Available now, the DS15MB200 is priced at $5.95 each, the SCAN15MB200 is $6.25 and the DS08MB200 is $4.25, all in 1k-unit quantities.

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

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