SY87702L_06 Datasheet, PDF (1/14 Pages) Micrel Semiconductor – 3.3V 28Mbps-2.5Gbps AnyRate CLOCK AND DATA RECOVERY

Micrel, Inc.
3.3V 28Mbps-2.5Gbps AnyRate^®
CLOCK AND DATA RECOVERY
SY87702L
SY87702L
FEATURES
DESCRIPTION
■ 3.3V power supply
■ Complies with Bellcore, ITU/CCITT and ANSI
specifications for applications such as OC-1, OC-3,
OC-12, OC-48*, and ATM
■ Compatible with FDDI, Gigabit Ethernet, Fibre
Channel, 2X Fibre Channel, SMPTE 259 and 292, and
proprietary applications
■ Low power
■ Clock and data recovery from 28Mbps up to 2.5Gbps
NRZ data stream
■ Selectable reference frequencies via programmable
multiplier
■ Differential PECL and CML high-speed serial outputs
■ Line receiver input: no external buffering needed
■ Link fault indication
■ 100K ECL compatible I/O
■ Available in 64-Pin EP-TQFP package
■ Product obsolete. Use SY87721L for new designs
The SY87702L is a complete Clock Recovery and Data
retiming integrated circuit for data rates from 28Mbps up to
2.5Gbps NRZ. 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 and can be used as a Clock
Multiplier Unit (CMU). The integrated CMU can provide this
clock signal at the TCLK outputs. Additionally, the TCLK
output can be selected to provide a copy of the RCLK
frequency.
For SONET/SDH applications, the SY87702L includes a
Link Fault Detection circuit. This circuit, enabled by the output
of an optical module driving the CD input low, causes the
recovery PLL of the SY87702L to lock to the reference
clock's multiplied frequency under Loss-of-Signal conditions.
This low jitter clock is provided at the RCLK outputs and is
at the same frequency as that provided at the TCLK output.
*Meets OC-48 Jitter Tolerance and Transfer
APPLICATIONS
■ Transponders and section repeaters
■ Multiplexer's: access, add drop (ADM), and terminal
(TM)
■ SONET/SDH/ATM: -based transmission systems,
modules, and test equipment
■ Terabit routers and broadband cross-connects
■ Fibre optic test equipment
■ HDTV switching and transmission
AnyRate^® is a registered trademark of Micrel, Inc.
M9999-072706
1
[e-mail] or [phone]
Rev.: D Amendment: /0
Issue Date: July 2006