SY87721L Datasheet, PDF (1/15 Pages) Micrel Semiconductor – 3.3V 28Mbps-2.7Gbps ANYRATE CLOCK AND DATA RECOVERY WITH INTEGRATED CLOCK MULTIPLIER UNIT

Micrel, Inc.
3.3V 28Mbps-2.7Gbps AnyRate^®
CLOCK AND DATA RECOVERY WITH
INTEGRATED CLOCK MULTIPLIER UNIT
SY87721L
SY87721L
FEATURES
s 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
s Integrated clock multiplier unit with low jitter
generation
s Complies with Bellcore, ITU/CCITT and ANSI
specifications
s Selectable mux for pass through; avoids jitter
accumulation when switching through backplanes
s Available in 64-Pin EPAD-TQFP package
DESCRIPTION
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.
SIMPLIFIED BLOCK DIAGRAM
AnyRate
Data In
2
SY87721L
CDR
Reference
Clock
2
CMU
AnyRate
Data Out
2
2
Recovered
Clock
2
Transmit
Clock
APPLICATIONS
s SONET/SDH/ATM-based transmission systems,
modules, and test equipment
s Transponders and section repeaters
s Multiplexers: access, add drop (ADM), and terminal (TM)
s Terabit routers and broadband cross-connects
s Fiber optic test equipment
AnyRate is a registered trademark of Micrel, Inc.
M9999-072705
[e-mail] or [phone]
1
Rev.: B Amendment: /0
Issue Date: July 2005