VSC8222 VSC8223
Multi-rate SONET/SDH, Fibre Channel, and Gigabit Ethernet CDR
GENERAL DESCRIPTION:
The VSC8222 and VSC8223 are high performance,
multi-rate clock and data recovery ICs that
support SONET/SDH systems operating at
OC-48 (STM-16), OC-12 (STM-4), OC-3 (STM-
1), Fibre Channel (1.0625 Gbps and 2.125
Gbps), Gigabit Ethernet (1.25 Gbps and 2.5
Gbps), and FEC data rates. High speed input and output signals
are terminated on-chip to maintain the highest degree of signal
integrity possible. The devices output a differential bit clock
and differential retimed data.
BLOCK DIAGRAM:
LOS
LOL
BYPASS
Two selectable, externally supplied reference clock inputs
support the Phase Lock Loop (PLL) operation and are used to
maintain a lock condition when the high-speed data is missing at
the input. The PLL has four different Loop bandwidth settings,
allowing the designer to adjust the jitter transfer and tolerance
attributes of the device. The PLL can be bypassed to accommodate
rates not supported by the PLL.
The VSC8222 and VSC8223 require a 2.5 V supply and are available
in a 7x7x1.4mm 48-pin, thermally enhanced PQFP package.
MUX
DATA
O/P
SDO
SDO
SDI
VTT
SDI
I/P
CRU BLOCK
MUX
CLOCK
O/P
SCO
SCO
REFCLK1
REFCLK1
REFCLK0
REFCLK0
MUX
REFCLK
FREQ.
SELECT
LOCK TO
REFERENCE
BLOCK
RCLK_SEL RCLK_FSEL[1:0]
LREF_DIS
LREF
SCO_EN
A P P L I C AT I O N D I A G R A M :
Clock Recovery
VSC7971WE
VSC7971-W
DATA
TIA
VSC8222
CLOCK
ASIC
VSC7939
VSC7940
LD
VSC8222
Data Retiming
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
741 Calle Plano
Camarillo, CA 93012, USA
Tel: +1 805.388.3700
Fax: +1 805.987.5896
www.vitesse.com
©2003 Vitesse Semiconductor Corporation
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
