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Low-Jitter Transceivers from National Semiconductor are said to Deliver 30 Percent More Backplane and Cable Reach

30th June 2009

National Semiconductor

ES Admin

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National Semiconductor has introduced two energy-efficient, quad transceivers that are said to extend backplane and cable reach up to 30 percent farther than competitive devices. These PowerWise signal conditioning devices drive high-speed signals in data center servers and storage area networks (SANs). The DS50PCI401 is PCI-SIG-approved to the PCI Express (PCIe) Gen1 (2.5 Gbps) and Gen2 (5 Gbps) specifications, while the DS64BR401 supports both 3 Gbps and 6 Gbps SATA/SAS specifications, along with other high-speed signaling standards such as XAUI, serial Rapid IO (sRIO) and Fibre Channel.

The DS50PCI401 four-lane, bidirectional PCIe transceiver provides both adjustable receive equalization and transmit de-emphasis, along with the industry’s lowest power at 190 mW typical per lane. In addition, it supports a selectable low-power state as well as power-down of individual lanes. The DS50PCI401 compensates for transmission medium losses, reducing deterministic jitter on eight transmission channels. It equalizes more than 10 meters of PCIe cable or 40 inches of FR-4 printed circuit board (PCB) at transmission rates up to 5 Gbps. At seven meters of PCIe cable equalization, the DS50PCI401 achieves less than 0.10 unit intervals (UI) of residual jitter at the equalizer output. This extended reach enables the use of lower-cost, thinner (higher gauge) PCIe cable.

The DS50PCI401 offers a unique automatic rate detect feature that adjusts the output signal conditioning to achieve the maximum benefit at Gen1 and Gen2 data rates. In addition, the DS50PCI401 supports PCIe specific out-of-band (OOB) signaling such as transmit idle, receive detect and beacon signal pass through.