SY87701L_11 Datasheet, PDF (1/14 Pages) Micrel Semiconductor – 3.3V 32-1250Mbps AnyRate CLOCK AND DATA RECOVERY Use lower-power SY87701AL for new designs

Micrel, Inc.
3.3V 32-1250Mbps AnyRate^®
CLOCK AND DATA RECOVERY
SY87701L
SY87701L
Use lower-power SY87701AL for new designs
FEATURES
■ Industrial temperature range (–40°C to +85°C)
■ 3.3V power supply
■ Clock and data recovery from 32Mbps up to
1.25Gbps NRZ data stream, clock generation from
32Mbps to 1.25Gbps
■ Complies with Bellcore, ITU/CCITT and ANSI
specifications for applications such as OC-1, OC-3,
OC-12, ATM, FDDI, Fibre Channel and Gigabit
Ethernet as well as proprietary applications
■ Two on-chip PLLs: one for clock generation and
another for clock recovery
■ Selectable reference frequencies
■ Differential PECL high-speed serial I/O
■ Line receiver input: no external buffering needed
■ Link fault indication
■ 100k ECL compatible I/O
■ Available in 32-pin EPAD-TQFP and 28-pin SOIC
packages (28-pin SOIC is available, but NOT
recommended for new designs.)
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.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
APPLICATIONS
■ SONET/SDH/ATM OC-1, OC-3, OC-12, OC-24
■ Fibre Channel, Escon, SMPTE 259
■ Gigabit Ethernet/Fast Ethernet
■ Proprietary architecture up to 1.25Gbps
BLOCK DIAGRAM
PLLR P/N
RDINP
(PECL)
RDINN
CD
(PECL)
REFCLK
(TTL)
PHASE
DETECTOR
0
1
PHASE/
FREQUENCY
DETECTOR
CHARGE
PUMP
VCO
PHASE/
FREQUENCY
DETECTOR
CHARGE
PUMP
VCO
LINK
FAULT
DETECTOR
1
0
DIVIDER
BY 8, 10, 16, 20
DIVSEL 1/2
(TTL)
AnyRate is a registered trademark of Micrel, Inc.
M9999-111506
[e-mail] or [phone]
SY87701L
PLLS P/N
FREQSEL 1/2/3
(TTL)
1
CLKSEL
(TTL)
RDOUTP
(PECL)
RDOUTN
RCLKP
(PECL)
RCLKN
LFIN
(TTL)
TCLKP
(PECL)
TCLKN
VCC
VCCA
VCCO
GND
Rev.: G Amendment: /0
Issue Date: Novembe 2006