SY89846U 1.5GHz Precision, LVPECL 1:5 Fanout with 2:1 MUX and Fail Safe Input with Internal Termination Precision Edge General Description The SY89846U is a 2.5/3.3V, 1:5 LVPECL fanout Precision Edge buffer with a 2:1 differential input multiplexer (MUX). Features A unique Fail-Safe Input (FSI) protection prevents metastable output conditions when the selected Selects between two inputs, and provides 5 precision input clock fails to a DC voltage (voltage between LVPECL copies the pins of the differential input drops significantly Fail-Safe Input below 100mV). Prevents outputs from oscillating when input is The differential input includes Micrels unique, 3-pin invalid internal termination architecture that can interface to Guaranteed AC performance over temperature and any differential signal (AC- or DC-coupled) as small supply voltage: as 100mV (200mV ) without any level shifting or PP DC-to >1.5GHz throughput termination resistor networks in the signal path. The < 900ps Propagation Delay (IN-to-Q) outputs are 800mV, LVPECL with fast rise/fall times < 250ps Rise/Fall times guaranteed to be less than 250ps. Ultra-low jitter design: The SY89846U operates from a 2.5V 5% or 3.3V 150fs RMS phase jitter (Typ) 10% supply and is guaranteed over the full 0.7ps MUX crosstalk induced jitter RMS industrial temperature range of 40C to +85C. The Unique, patented MUX input isolation design SY89846U is part of Micrels high-speed, Precision minimizes adjacent channel crosstalk Edge product line. Unique patented internal termination and VT pin All support documentation can be found on Micrels accepts DC- and AC-coupled inputs (CML, PECL, web site at: www.micrel.com. LVDS) Wide input voltage range. VCC to GND 2.5V 5% or 3.3 10% supply voltage Functional Block Diagram -40C to +85C industrial temperature range Available in 32-pin (5mm x 5mm) QFN package Applications Fail-safe clock protection SONET clock distribution Backplane distribution Markets LAN/WAN Enterprise servers ATE Test and measurement 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. SY89846U (1) Ordering Information Part Number Package Operating Package Marking Lead Finish Type Range SY89846U with NiPdAu SY89846UMG QFN-32 Industrial Pb-Free bar-line Indicator Pb-Free SY89846U with NiPdAu (2) SY89846UMGTR QFN-32 Industrial Pb-Free bar-line Indicator Pb-Free Notes: 1. Contact factory for die availability. Dice are guaranteed at T = 25C, DC Electricals Only. A 2. Tape and Reel. Pin Configuration 32-Pin QFN (QFN-32) Oct. 1, 2013 2 M9999-072211B hbwhelp micrel.com or (408) 955-1690