SY87721L 3.3V 28Mbps-2.7Gbps AnyRate® Clock and Data Recovery with Integrated Clock Multiplier Unit0 pages

SY87721L
1
Micrel, Inc.
M9999-012508
hbwhelp@micrel.com or (408) 955-1690
3.3V 28Mbps-2.7Gbps AnyRate®
CLOCK AND DATA RECOVERY WITH
INTEGRATED CLOCK MULTIPLIER UNIT
FEATURES DESCRIPTION
SY87721L
Recovers any data and clock from 28Mbps to
2.7Gbps
• OC-1, OC-3, OC-12, OC-48, ATM
• Gigabit Ethernet, Fast Ethernet
• Fibre Channel, 2x Fibre Channel
• P1394, Infiniband
• SMPTE-259, SMPTE-292
• Proprietary optical transport
Integrated clock multiplier unit with low jitter
generation
Complies with Bellcore, ITU/CCITT and ANSI
specifications
Selectable mux for pass through; avoids jitter
accumulation when switching through backplanes
Available in 64-Pin EPAD-TQFP package
The SY87721L is a complete Clock Recovery and Data
retiming integrated circuit for data rates from 28Mbps up to
2.7Gbps NRZ including SONET FEC data rates. Included
in the device, is a fully integrated Clock Multiplier Unit (CMU)
that is capable of generating frequencies that cover the
same data rate range as the CDR. The device is ideally
suited for SONET/SDH/ATM, Fibre Channel, and Gigabit
Ethernet applications, as well as other high-speed data
transmission applications.
Clock recovery and data retiming is performed by
synchronizing the on-chip VCO directly to the incoming data
stream. The VCO center frequency is controlled by the
reference clock frequency and the selected divide ratio.
On-chip clock generation is performed through the use of a
frequency multiplier PLL with a byte rate or code group rate
source as reference.
Rev.: D Amendment: /0
Issue Date: January 2008
SIMPLIFIED BLOCK DIAGRAM
SY87721L
AnyRate
Data In
Reference
Clock
2
2
2
2
AnyRate
Data Out
Transmit
Clock
2
CDR
Recovered
Clock
CMU
APPLICATIONS
SONET/SDH/ATM-based transmission systems,
modules, and test equipment
Transponders and section repeaters
Multiplexers: access, add drop (ADM), and terminal (TM)
Terabit routers and broadband cross-connects
Fiber optic test equipment
AnyRate is a registered trademark of Micrel, Inc.