SY89468U Precision LVDS 1:20 Fanout with 2:1 MUX and Internal Termination with Fail-Safe Input General Description Precision Edge The SY89468U is a 2.5V, 1:20 LVDS fanout buffer with a 2:1 differential input multiplexer (MUX). A Features unique Fail-Safe Input (FSI) protection prevents Selects between two inputs, and provides 20 metastable output conditions when the selected precision LVDS copies input clock fails to a DC voltage (voltage between Fail-Safe Input the pins of the differential input drops significantly Prevents outputs from oscillating when input is 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 >1.5GHz 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 LVDS compatible with very fast rise/fall < 270ps Rise/Fall times times guaranteed to be less than 270ps. Ultra-low jitter design: The SY89468U operates from a 2.5V 5% supply <1ps random jitter RMS and is guaranteed over the full industrial <1ps cycle-to-cycle jitter RMS temperature range of 40C to +85C. The <10ps total jitter (clock) PP SY89468U 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 VCC to GND 2.5V 5% supply voltage -40C to +85C industrial temperature range Available in 64-pin EPAD-TQFP package Applications Fail-safe clock protection Ultra-low jitter LVDS clock or data distribution Rack-based Telecom/Datacom 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. SY89468U (1) Ordering Information Part Number Package Operating Package Marking Lead Type Range Finish SY89468UHY with Matte-Sn SY89468UHY H64-1 Industrial Pb-Free bar-line Indicator Pb-Free SY89468UHY with Matte-Sn (2) SY89468UHYTR H64-1 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 (H64-1) November 2008 2 M9999-110308-D hbwhelp micrel.com or (408) 955-1690