SY58031U Ultra-Precision 1:8 CML Fanout Buffer with Internal I/O Termination General Description The SY58031U is a 2.5V/3.3V precision, high-speed, fully differential CML 1:8 fanout buffer. The SY58031U is Precision Edge optimized to provide eight identical output copies with less than 20ps of skew and only 75fs phase jitter. It can RMS Features process clock signals as fast as 6GHz. Precision 1:8, 400mV CML fanout buffer The differential input includes Micrels unique, 3-pin input Guaranteed AC performance over temperature and termination architecture that allows the SY58031U to voltage: directly interface to CML, LVPECL, and LVDS differential signals (AC- or DC-coupled) without any level-shifting or Clock frequency range: DC to >6GHz termination resistor networks in the signal path. The result <60ps t /t time r f is a clean, stub-free, low-jitter interface solution. The CML <270ps t pd outputs feature 400mV typical swing into 50 loads and <20ps output-to-output skew provide an extremely fast rise/fall time guaranteed to be less than 60ps. Low-jitter performance: 75fs phase jitter (typ.) RMS The SY58031U operates from a 2.5V 5% supply or 3.3V 10% supply and is guaranteed over the full industrial 50 source-terminated CML outputs temperature range (40C to +85C). For applications that 400mV CML output swing into 50 load require high-speed 1:8 LVPECL fanout buffers, consider Fully differential I/O the SY58032U and SY58033U. The SY58031U is part of Accepts an input signal as low as 100mV Micrels high-speed, Precision Edge product line. Unique, patent-pending input termination and VT pin Datasheets and support documentation are available on accepts DC-coupled and AC-couple differential inputs Micrels web site at: www.micrel.com. (LVPECL, LVDS, and CML) Power supply 2.5V 5% or 3.3V 10% Block Diagram Industrial temperature range: 40C to +85C Available in 32-pin, 5mm 5mm QFN package Q0 /Q0 Applications Q1 /Q1 All SONET and GigE clock distribution Q2 /Q2 All Fibre Channel clock and data distribution IN 50 Q3 Network routing engine timing distribution V T /Q3 50 High-end, low-skew multiprocessor synchronous clock /IN Q4 distribution /Q4 V REF-AC Q5 /Q5 Q6 /Q6 Q7 /Q7 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. SY58031U Ordering Information (1) Part Number Package Type Operating Package Marking Lead Finish Range SY58031UMG QFN-32 Industrial SY58031U with Pb-free bar-line indicator Pb-Free NiPdAu (2) SY58031UMGTR QFN-32 Industrial SY58031U with Pb-free bar-line indicator Pb-Free NiPdAu Note: 1. Contact factory for die availability. Dice are guaranteed at T = 25C, DC electricals only. A 2. Tape and Reel. Revision 5.0 October 1, 2013 2 hbwhelp micrel.com or (408) 955-1690