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Quad transceivers claims lowest jitter

Posted: 06 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:transceiver? PCIe? Fibre Channel?

DS50PCI401, DS50PCI401 transceivers

National Semiconductor Corp. has released the DS50PCI401 and the DS64BR401 quad transceivers that increase backplane and cable reach up to 30 percent farther than competitive devices in data center servers and storage area networks.

The DS50PCI401 is PCI-SIG-approved to the PCIe Gen1 (2.5Gbit/s) and Gen2 (5Gbit/s) specifications. The DS64BR401 supports both 3Gbit/s and 6Gbit/s 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 190mW typical per lane. It supports a selectable low-power state as well as power-down of individual lanes. The device compensates for transmission medium losses, reducing deterministic jitter on eight transmission channels. It equalizes more than 10m of PCIe cable or 40 inches of FR-4 PCB at transmission rates up to 5Gbit/s. 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. It offers automatic rate detect feature that adjusts the output signal conditioning to achieve the maximum benefit at Gen1 and Gen2 data rates. Also the DS50PCI401 supports PCIe specific out-of-band (OOB) signaling such as transmit idle, receive detect and beacon signal pass through.

The DS64BR401 four-lane, bidirectional SATA/SAS transceiver provides both adjustable receive equalization and transmit de-emphasis, and has undergone extensive interoperability testing with third-party host and target devices. It equalizes up to 10m of SATA/SAS cable or 40 inches of FR-4 PCB at transmission rates up to 6.4Gbit/s, with less than 0.25 UI of residual jitter at the equalizer output.

With a typical power consumption of 200mW typical per lane, the DS64BR401 supports OOB signaling with approximately 3ns typical of envelope distortion, ensuring compatibility with the SATA/SAS specification. It also offers an adjustable voltage output differential of 600mV peak-to-peak (p-p) to 1200mV p-p. The DS64BR401 provides automatic power management on an individual lane basis via an SMBus interface.

The DS50PCI401 and DS64BR401 are the latest additions to National's growing family of quad-, dual- and single-channel PowerWise signal conditioning products. National fabricates these devices on its high-performance SiGe BiCMOS-8 process technology.

The transceivers are available now in a 10mm x 5.5mm, 54-pin leadless LLP package. The DS50PCI401 PCIe transceiver is priced at $9.95 each, and the DS64BR401 SATA/SAS transceiver is priced at $11.25 each. All prices are in 1,000-unit quantities.

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