SY87701L Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 3.3V 32-1250Mbps AnyRate™ CLOCK AND DATA RECOVERY

3.3V 32-1250Mbps AnyRate™
CLOCK AND DATA RECOVERY
SY87701L
FEATURES
s Industrial temperature range (–40°C to +85°C)
s 3.3V power supply
s Clock and data recovery from 32Mbps up to
1.25Gbps NRZ data stream
s Complies with Bellcore, ITU/CCITT and ANSI
specifications for applications such as OC-1, OC-3,
OC-12, ATM, FDDI, etc.
s Two on-chip PLLs: one for clock generation and
another for clock recovery
s Selectable reference frequencies
s Differential PECL high-speed serial I/O
s Line receiver input: No external buffering needed
s Link fault indication
s 100K ECL compatible I/O
s Available in 28-pin SOIC and 32-pin EP-TQFP
packages
DESCRIPTION
The SY87701L is a complete Clock Recovery and Data
Retiming integrated circuit for data rates from 32Mbps
up to 1.25Gbps NRZ. The device is ideally suited for
SONET/SDH/ATM and Fibre Channel applications and
other high-speed data transmission systems.
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 source
as reference.
The SY87701L also includes a link fault detection
circuit.
APPLICATIONS
s SONET/SDH/ATM OC-1, OC-3, OC-12, OC-24
s Fibre Channel, Escon
s Gigabit Ethernet/Fast Ethernet
s Proprietary architecture up to 1.25Gbps
BLOCK DIAGRAM
PLLR P/N
RDINP
(PECL)
RDINN
CD
(PECL)
PHASE
DETECTOR
0
1
PHASE/
FREQUENCY
DETECTOR
CHARGE
PUMP
VCO
LINK
FAULT
DETECTOR
RDOUTP
(PECL)
RDOUTN
RCLKP
(PECL)
RCLKN
LFIN
(TTL)
REFCLK
PHASE/
(TTL)
FREQUENCY
DETECTOR
CHARGE
PUMP
VCO
1
0
DIVIDER
BY 8, 10, 16, 20
DIVSEL 1/2
(TTL)
AnyRate™ is a trademark of Micrel, Inc.
SY87701L
PLLS P/N
FREQSEL 1/2/3
(TTL)
1
CLKSEL
(TTL)
TCLKP
(PECL)
TCLKN
VCC
VCCA
VCCO
GND
Rev.: B Amendment: /0
Issue Date: September 2000