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Dual SAS-SATA redriver supports speeds up to 6Gbps

Thu, 04/29/2010 - 5:52am
4952BrgbMaxim Integrated Products introduces the MAX4952B, a dual-channel buffer designed to redrive SAS/eSATA/SATA signals at speeds up to 6.0Gbps on both the transmit and receive channels. This device preserves signal integrity at the receiver by reestablishing full output levels, and it can reduce total system jitter (TJ) by squaring the signal. The MAX4952B is designed for applications such as servers in which the user needs to route the signal through connectors and over long backplanes, onto a mezzanine board, and through an external connector while being compliant with the Serial ATA International Organization: Serial ATA Revision 3.0 (SATA 6Gbps). It is also well suited for workstations that must carry signals over long cables and boards while overcoming losses on the PCB and in the eSATA connector.

The MAX4952B supports SAS/SATA out-of-band (OOB) signaling by using high-speed amplitude detection on the inputs and amplitude squelch on the corresponding outputs. When in SAS mode, input signals of 120mVp-p or less are detected as off and not passed to the output. When in SATA mode, the OOB detection circuitry squelches any input signal less than 50mVp-p. This approach prevents the system from responding to unwanted noise, while still allowing OOB signals to transmit through the MAX4952B.

This redriver integrates a power-down mode to squelch the output through an enable input, as well as independent output-boost controls. The independent boost control allows users to program each redriver channel to overcome losses presented by the board, as well as any other losses seen in the signal path.

The MAX4952B operates from a single 3.3V supply, and is fully specified over the 0 degrees Celsius to +70 degrees Celsius commercial temperature range. It is available in an ultra-small, 4mm x 4mm, 20-pin TQFN package. Prices start at $2.50 (1000-up, FOB USA).

Maxim Integrated Products is a publicly traded company that designs, manufactures, and sells high-performance semiconductor products. The Company was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, it has developed over 6300 products serving the industrial, communications, consumer, and computing markets.

Maxim reported revenue in excess of $1.6 billion for fiscal 2009. A Fortune 1000 company, Maxim is included in the Nasdaq 100, the Russell 1000, and the MSCI USA indices. For more information, go to www.maxim-ic.com.

DATA SHEET: A Data Sheet for this product is available on the web.
http://www.maxim-ic.com/MAX4952B

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