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 Precision Edge optimized for precision telecom and enterprise server Features distribution applications. The SY89859U distributes clock frequencies from DC to >2.5GHz, and data rates Selects between 1 of 8 inputs, and provides 2 to 2.5Gbps guaranteed over temperature and voltage. precision, low skew 100K-compatible LVPECL output copies The SY89859U differential input includes Micrels unique, 3-pin input termination architecture that Low power: 150mW typ. (2.5V) directly interfaces to any differential signal (AC- or Guaranteed AC performance over temperature and DC-coupled) as small as 100mV (200mVpp) without voltage: level shifting or termination resistor networks in the DC to >2.5Gbps signal path. The outputs are 800mV, 100K-compatible DC to >2.5GHz LVPECL with extremely fast rise/fall time guaranteed <690ps propagation delay to be less than 180ps. <180ps t /t time The SY89859U features a patent-pending isolation r f design that significantly improves on channel-to- <20ps skew (output-to-output) channel crosstalk-induced jitter performance. Unique, patent-pending channel-to-channel isolation design provides superior crosstalk The SY89859U operates from a 2.5V 5% or 3.3V 10% supply and is guaranteed over the full industrial performance temperature range of 40C to +85C. The SY89859U Ultra-low jitter design: is part of Micrels high-speed, Precision Edge product <1ps random jitter RMS line. <10ps deterministic jitter PP All support documentation can be found on <10ps total jitter (clock) PP Micrels web site at: www.micrel.com. <1ps cycle-to-cycle jitter RMS <0.7ps crosstalk-induced jitter RMS 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% 40C to +85C industrial temperature range Available in 44-pin (7mm x 7mm) QFN package Applications Data communication systems All SONET/SDH data/clock applications All Fibre Channel applications All Gigabit Ethernet applications United States Patent No. RE44,134 Precision Edge is a registered trademark of Micrel, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY89859U Functional Block Diagram December 2007 2 M9999-120607-D hbwhelp micrel.com or (408) 955-1690