SY58021U 4GHz, 1:4 LVPECL Fanout Buffer/Translator with Internal Termination Precision Edge General Description The SY58021U is a 2.5V/3.3V precision, high-speed, fully Precision Edge differential 1:4 LVPECL fanout buffer. Optimized to provide Features four identical output copies with less than 15ps output skew and only 70 fs phase jitter, the SY58021U can RMS Precision 1:4 LVPECL fanout buffer process clock signals as fast as 4GHz. Low jitter performance: The differential input includes Micrels unique, 3-pin input 70fs phase jitter (typical) RMS termination architecture interfaces to differential LVPECL, Accepts an input signal as low as 100mV CML, and LVDS signals (AC- or DC-coupled) as small as Unique input termination and VT pin accepts DC- 100mV without any level-shifting or termination resistor coupled and AC-coupled differential inputs: LVPECL, networks in the signal path. For AC-coupled input interface LVDS, and CML applications, an on-board output reference voltage (V ) REF AC 100k LVPECL-compatible 800mV swing output is provided to bias the VT pin. The outputs are 100k LVPECL compatible, with extremely fast rise/fall times Power supply 2.5V 5% and 3.3V 10% guaranteed to 70fs. 40C to +85C temperature range The SY58021U operates from a 2.5V 5% supply or 3.3V Available in 16-pin (3mm 3mm) QFN package 10% supply and is guaranteed over the full industrial temperature range (40C to +85C). For applications that Applications require faster rise/fall times, or greater bandwidth, consider the SY58022U 1:4 fanout buffer with 400mV LVPECL All SONET and GigE clock distribution output swing, or the SY58020U 1:4 CML fanout buffer. The Fibre Channel clock and data distribution SY58021U is part of Micrels high-speed, Precision Edge Backplane distribution product line. High-end, low-skew, multiprocessor, synchronous clock Data sheets and support documentation can be found on distribution Micrels web site at www.micrel.com. Block Diagram 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. SY58021U (1) Ordering Information Part Number Package Type Operating Range Package Marking Lead Finish SY58021UMI QFN-16 Industrial 021U Sn-Pb (2) SY58021UMITR QFN-16 Industrial 021U Sn-Pb Pb-Free (3) SY58021UMG QFN-16 Industrial 021U with Pb-Free bar-line indicator NiPdAu Pb-Free (2, 3) SY58021UMGTR QFN-16 Industrial 021U with Pb-Free bar-line indicator NiPdAu Notes: 1. Contact factory for die availability. Dice are guaranteed at T = 25 C, DC electrical only. A 2. Tape and Reel. 3. Pb-Free package recommended for new designs. Pin Configuration 16-Pin QFN M9999-090111-B September 2011 2 hbwhelp micrel.com or (408) 955-1690