SY89467U Precision LVPECL 1:20 Fanout with 2:1 MUX and Internal Termination with Fail-Safe Input General Description Precision Edge The SY89467U is a 2.5/3.3V, 1:20 LVPECL fanout Features buffer with a 2:1 differential input multiplexer (MUX). A unique Fail-Safe Input (FSI) protection prevents Selects between two inputs, and provides 20 metastable output conditions when the selected precision LVPECL copies input clock fails to a DC voltage (when voltage Fail-Safe Input between the pins of the differential input drops Prevents outputs from oscillating when input is significantly below 100mV). invalid The differential input includes Micrels unique, 3-pin Guaranteed AC performance over temperature and internal termination architecture that can interface to supply voltage: any differential signal (AC- or DC-coupled) as small DC-to >1.5 GHz throughput as 100mV (200mV ) without any level shifting or PP < 1200ps Propagation Delay (In-to-Q) termination resistor networks in the signal path. The outputs are 800mV, LVPECL with fast rise/fall times 270ps Rise/Fall times guaranteed to be less than 270ps. Ultra-low jitter design: <1ps random jitter The SY89467U operates from a 2.5V 5% or 3.3V RMS <1ps cycle-to-cycle jitter 10% supply and is guaranteed over the full RMS <10ps total jitter (clock) industrial temperature range of 40C to +85C. The PP SY89467U is part of Micrels high-speed, Precision <0.7ps MUX crosstalk induced jitter RMS Edge product line. Unique, patented MUX input isolation design minimizes adjacent channel crosstalk All support documentation can be found on Micrels web site at: www.micrel.com. Unique patented internal termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS) Functional Block Diagram Wide input voltage range: V to GND CC 2.5V 5% or 3.3V 10% supply voltage -40C to +85C industrial temperature range Available in 64-pin TQFP 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. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY89467U (1) Ordering Information Package Operating Lead Part Number Package Marking Type Range Finish SY89467UHY with Matte-Sn SY89467UHY T64-1 Industrial Pb-Free bar-line Indicator Pb-Free SY89467UHY with Matte-Sn (2) SY89467UHYTR T64-1 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 64-Pin EPAD-TQFP (T64-1) April 2008 2 M9999-040808-C hbwhelp micrel.com or (408) 955-1690