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whatsoever arising out of the application or use of any product or circuit. The products sold hereunder and any other products sold by Microsemi have been subject to limited testing and should not be used in conjunction
with mission-critical equipment or applications. Any performance specifi cations are believed to be reliable but are not verifi ed, and Buyer must conduct and complete all performance and other testing of the products, alone
and together with, or installed in, any end-products. Buyer shall not rely on any data and performance specifi cations or parameters provided by Microsemi. It is the Buyer’s responsibility to independently determine suitability
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Applications
• Wideband signal switching and clean-up
• Line driver or receiver
• Backplane signal fanout, driver, or receiver
• Copper cable driver or receiver
• PCB signal enhancement
Specifi cations
• 8.5 Gbps non-return-to-zero (NRZ) per-
channel data rate
• 2.5 V core, 1.8 V, 2.5 V, and 3.3 V high-
speed I/O
• 3.2 W maximum at 3.3 V, or 2.4 W at 2.5 V,
or 2 W at 1.8 V
VSC3312-01
8
.5 Gbps 12x12 Crosspoint Switch
The VSC3312-01 is a 12-port 8.5 Gbps asynchronous switch with advanced
signal equalization designed for high-speed serial backplanes and cable
interconnect applications. VSC3312-01 switches allow multicast, loopback,
and reconfi gurable Input/Output (I/O) capability for great fl exibility in allocating
and routing signals in a broad range of applications. The VSC3312-01
includes dual time-constant equalization, which signifi cantly reduces jitter
associated with driving multigigabit signals across backplanes and cables. A
fully asynchronous architecture allows any data rate or protocol on any channel
without the need for an external reference clock. This gives the VSC3312-01
wire-like interoperability in virtually any application that uses binary signaling.
The VSC3312-01 can also be used as a buffer that simplifi es and enhances
the design of high-speed signal paths by providing signal equalization at both
inputs and outputs to reduce or reverse signal degradation due to transmission
line effects.
The VSC3312-01 has a total of 24 ports. Eight are dedicated inputs, eight
are dedicated outputs, and the remaining eight may be confi gured as either
inputs or outputs without restriction. This design provides the fl exibility of using
the device as a standard 12x12 crosspoint, or any ratio from 8x16 to 16x8.
This unique feature allows full I/O utilization in any application that has less
than a 2:1 ratio between inputs and outputs. In many cases, this translates
to a signifi cant reduction in chip count. Featuring programmable input signal
equalization and output pre-emphasis, each with multiple time constants, the
VSC3312-01 is also ideal for countering signal degradation over a wide variety
of transmission media types and lengths.
Typical power consumption for the device is 160 mW per active channel, and
unused channels may be deactivated to save the power associated with those
ports. The output drivers for the VSC3312-01 also feature a wide supply
voltage range (from 1.8 V to 3.3 V) that allows fl exibility in matching the output
swing to application requirements.
The VSC3312-01 has a LOS detector with programmable thresholds on every
input port. The LOS status can be made to appear at either of two status pins
for external use. The LOS signal can also be switched to each of the outputs in
concert with the high-speed switching core. LOS forwarding can be enabled for
each of the outputs, which will cause the outputs to be squelched in response
to a LOS detect at the corresponding input, thereby propagating signal
envelopes through the switch.
Programming of the VSC3312-01 is through a standard two-wire serial
interface. The interface address can be hardwired through static pins or through
a proprietary two-pin interface that allows for address selection after power-
up. All pin functions such as Confi g, ResetB, and Status pin states are also
accessible through registers to ensure maximum fl exibility.
Switch Card
1 Gbps to
8.5 Gbps
Lanes
1 Gbps to
8.5 Gbps
Lanes
Line Cards
VSC3312
Backplane
ASIC
ASIC
