SY89859U Datasheet, PDF (1/13 Pages) Micrel Semiconductor – Precision Low-Power 8:1 MUX with Internal Termination and 1:2 LVPECL Fanout Buffer

SY89859U
Precision Low-Power 8:1 MUX with Internal
Termination and 1:2 LVPECL Fanout Buffer
General Description
The SY89859U is a low jitter, low-power, high-speed
8:1 multiplexer with a 1:2 differential fanout buffer
optimized for precision telecom and enterprise server
distribution applications. The SY89859U distributes
clock frequencies from DC to >2.5GHz, and data rates
to 2.5Gbps guaranteed over temperature and voltage.
The SY89859U differential input includes Micrel’s
unique, 3-pin input termination architecture that
directly interfaces to any differential signal (AC- or
DC-coupled) as small as 100mV (200mVpp) without
level shifting or termination resistor networks in the
signal path. The outputs are 800mV, 100K-compatible
LVPECL with extremely fast rise/fall time guaranteed
to be less than 180ps.
The SY89859U features a patent-pending isolation
design that significantly improves on channel-to-
channel crosstalk-induced jitter performance.
The SY89859U operates from a 2.5V ±5% or 3.3V
±10% supply and is guaranteed over the full industrial
temperature range of –40°C to +85°C. The SY89859U
is part of Micrel’s high-speed, Precision Edge^® product
line.
All support documentation can be found on
Micrel’s web site at: www.micrel.com.
Precision Edge is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology.
Features
Precision Edge^®
• Selects between 1 of 8 inputs, and provides 2
precision, low skew 100K-compatible LVPECL
output copies
• Low power: 150mW typ. (2.5V)
• Guaranteed AC performance over temperature and
voltage:
– DC to >2.5Gbps
– DC to >2.5GHz
– <690ps propagation delay
– <180ps t_r/t_f time
– <20ps skew (output-to-output)
• Unique, patent-pending channel-to-channel
isolation design provides superior crosstalk
performance
• Ultra-low jitter design:
– <1ps_RMS random jitter
– <10ps_PP deterministic jitter
– <10ps_PP total jitter (clock)
– <1ps_RMS cycle-to-cycle jitter
– <0.7ps_RMS crosstalk-induced jitter
• Unique, patented input termination and VT pin
accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
• Power supply 2.5V ±5% or 3.3V ±10%
• –40°C to +85°C industrial temperature range
• Available in 44-pin (7mm x 7mm) MLF^® package
Applications
• Data communication systems
• All SONET/SDH data/clock applications
• All Fibre Channel applications
• All Gigabit Ethernet applications
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
February 2007
M9999-022007-B
[e-mail] or [phone]