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VSC7111 Datasheet
Product Overview
1
Product Overview
The VSC7111 is a quad-channel, low-cost, asynchronous buffer capable of data rates
from 0 Gbps to 11.5 Gbps. The VSC7111 can be used as a quad signal conditioner that
simplifies the design of high-speed signal paths (such as backplanes and cables) by
providing input and output signal equalization to reduce or reverse signal degradation
caused by losses in the transmission path. It is specifically designed to be used in
applications such as 10GBASE-KR backplanes, Quad Data Rate (QDR) Infiniband,
8G Fibre Channel, PCI-Express Gen 3, and 6G SAS/SATA.
The VSC7111 has four input and four output ports. Each port has integrated
terminations. Pre-defined signal-flow modes include 2:4 fanout and protection mode
(2:1 selector and 1:2 fanout).
Featuring programmable input signal equalization and output pre-emphasis (each with
multiple settings), the VSC7111 is also ideal for countering signal degradation over a
wide variety of transmission media types and lengths. The device can optionally adapt
its input equalization based on metrics gathered from the input signals.
Typical power consumption for the device is 158 mW per active channel in full power
mode, and 119 mW mW per active channel in Green mode. Unused channels can be
deactivated to save the power associated with those ports. Further power savings can
be realized by setting the output level settings to the minimum effective value for a
specific application.
The VSC7111 has a loss of signal (LOS) detector on every input port with
programmable thresholds. Out-of-band (OOB) signal forwarding can be enabled for
each of the outputs, which squelches the outputs in response to an LOS detect at the
corresponding input, thereby propagating an OOB envelope through the switch.
Optional programming of the VSC7111 is performed through a two-wire or four-wire
serial interface. The two-wire interface address can be selected using the serial address
pins, or a proprietary method that allows for address selection after power-up. The
four-wire serial interface uses the SSB pin to select the device.
The device can also be operated with no programming required by using Static Modes,
which provide control over a subset of the available device settings through the control
pins.
The VSC7111 device is packaged in a compact, 32-pin QFN with a 5 mm × 5 mm body
size. The device uses a single 2.5 V power supply and operates over a temperature
range of –40 °C ambient to 85 °C junction.
Revision 2.0
September 2010
Confidential
Page 9
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
