VSC8222 データシートの表示（PDF） - Vitesse Semiconductor
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VSC8222 Datasheet PDF : 2 Pages
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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.
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.
BLOCK DIAGRAM:
LOS LOL
BYPASS
SDI
VTT
I/P
SDI
REFCLK1
REFCLK1
REFCLK0
REFCLK0
MUX
REFCLK
FREQ.
SELECT
CRU BLOCK
LOCK TO
REFERENCE
BLOCK
MUX
DATA
O/P
SDO
SDO
MUX
CLOCK
O/P
SCO
SCO
RCLK_SEL RCLK_FSEL[1:0]
LREF_DIS
LREF SCO_EN
APPLICATION DIAGRAM:
Clock Recovery
VSC7971WE
VSC7971-W
TIA
VSC8222
DATA
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
©2003 Vitesse Semiconductor Corporation
741 Calle Plano
Camarillo, CA 93012, USA
Tel: +1 805.388.3700
Fax: +1 805.987.5896
www.vitesse.com
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