VSC8479YYY

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TXPCLK with Phase Adjust

TXMCLK

Ref Clk

Distribution and

Clean up

Tx Ref Clock

Rx Ref Clock

High-Speed Data

1:16

DEMUX

SFI-4

Phase 1/

16Low-Speed Data

RXMCLK

RXPOCLK

I

industry leading optimization of power, performance, programmability, price and feature integration. The

1.15W total power dissipation enables 300 pin MSA module vendors to provide performance and functionality

advantages while dropping the overall power dissipation of their existing modules. The VSC8479 is a perfect

choice for XFP motherboards with proven inter-operability with all major XFP module vendors.

The receiver path has a high sensitivity receiver with a programmable VGA and input bandwidth equalization

(EQ) to provide stressed input data eye compensation. No external post amplifi er is required for most

applications. The high-speed output is swing and pre-emphasis programmable to support a variety laser driver

and XFI host ASIC applications.

The VSC8479 fully supports all features, functions and clock modes required for 300-pin multi-source

agreement (MSA) transponder module full compliance. All loopback modes are supported with multiple line

testing.

Robust cross talk immunity enables the VSC8479 to operate the Tx and Rx paths asynchronously to each

other while exceeding SONET level jitter generation and jitter tolerance performance. A high-speed output clock

can be optionally enabled for higher performance applications. An adjustable loss of signal (LOS) indicator is

integrated into the device enabling optical modulation amplitude monitoring.

The power supply scheme provides a high degree of fl exibility. The device can operate on a single +1.8 V supply

with an optional +3.3 V I/O supply for 3.3 V compliant interfacing. The Tx path and Rx path can be powered

down independently. The single chip, small footprint (17 x 17 mm) allows for both cost reduction and board size

reduction for price and size aggressive, small form factor module applications. All VSC8479 devices are tested

at high-speed to insure the highest performance and quality standards you’ve come to expect from Microsemi.