For more information on Vitesse products, visit the Vitesse web site

at www.vitesse.com or contact Vitesse Sales at (800) VITESSE

or sales@vitesse.com

©2003 Vitesse Semiconductor Corporation

2.5G Multi-rate SONET/SDH Transceiver Family

VSC8142, 8145, 8147

The VSC8142, VSC8145 and VSC8147 are

extended multi-rate transceivers with

integrated Clock Recovery Unit (CRU) and Clock

Multiplier Unit (CMU) for use in SONET/SDH,

DWDM, and other optical transport systems.

The devices perform all required serialization

and deserialization functions for OC-48, OC-

12, OC-3, FEC, Gigabit Ethernet, Fibre Channel and FDDI/Fast

Ethernet data rates.

The integrated CRU Phase Locked Loop (PLL) recovers the high-

speed clock from the input Non-Return to Zero (NRZ) data signal.

The integrated CMU PLL multiplies a low-speed reference clock to

provide the high-speed serial line clock for internal logic and output

retiming. Both CRU and CMU can be bypassed to accommodate

rates not supported by the PLLs. The parallel interface incorporates

an on-board FIFO with auto-reset to eliminating interfacetiming

issues. The devices support serial looptiming as well as Facility,

Equipment, and Split loopback modes.

The VSC8142, VSC8145 and VSC8147 exceed the Telecordia and

ITU-T standards for jitter generation, tolerance and transfer

providing ample design margin.

The typical 800mW power

dissipation, along with the thermally-enhance packages, eliminates

the need for external heatsinks and allow the devices to be used in

diverse operating environments.

All device are available in

commercial and industrial temperature ranges.

BLOCK DIAGRAM:

GENERAL DESCRIPTION:

741 Calle Plano

Camarillo, CA 93012, USA

Tel: +1 805.388.3700

Fax: +1 805.987.5896

www.vitesse.com

BENEFITS:

Full SONET/SDH Jitter Compliance:

- Low Jitter Generation: less than 5mUI (typical)

- High Jitter Tolerance: exceeds 2x the SONET mask

Wide-ranging PLLs that not only Provide Support for the Standard

SONET/SDH Rates, but also for:

- Fibre Channel, 2xFibre Channel

- Gigabit Ethernet

- FEC

- FDDI

- Fast Ethernet

Integrated CRU and CMU can be Bypassed if an External CDR is

Required, (e.g, the All-Rate/Adaptive VSC8123 CDR)

The Order of the MSB and LSB on the Low-speed Interfaces can

be Reversed, Giving the Designer Increased Flexibility When

Laying Out the Board

On-board FIFO Auto-Reset Function Eliminates the Need to use

an External Logic

Loss of Signal Detection on High-speed Data Inputs for Robust

Line Monitoring Support

Automatic Lock to Reference Clock on LOS Detection Provides

Continuous Clocking for Upstream Devices

Integrated High-speed and Low-speed Test Capabilities Provide

System Diagnostic Support

RSDI

RefClk

TSDO

TSCLKO

CRU

CMU

RCLK4

TDI(0:3)

RDO(0:3)

RefClk

TCLK40

TCLK41

FIFO

DEMUX

MUX