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SY89465U Datasheet(PDF) 1 Page - Micrel Semiconductor |
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SY89465U Datasheet(HTML) 1 Page - Micrel Semiconductor |
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1 / 20 page  SY89465U Precision LVDS 1:10 Fanout with 2:1 Runt Pulse Eliminator MUX and Internal Termination 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 • http://www.micrel.com August 2010 M9999-080510-C hbwhelp@micrel.com or (408) 955-1690 General Description The SY89465U is a low-jitter, 1:10 LVDS fanout buffer with a 2:1 differential input multiplexer (MUX) optimized for redundant source switchover applications. Unlike standard multiplexers, the SY89465Us 2:1 Runt Pulse Eliminator (RPE) MUX prevents any short cycles or “runt” pulses during switchover. In addition, a unique Fail-Safe Input (FSI) protection prevents metastable conditions when the selected input clock fails to a DC voltage (voltage between the pins of the differential input drops below 100mV). The differential input includes Micrel’s, 3-pin internal termination architecture that allows customers to interface to any differential signal (AC- or DC- coupled) as small as 100mV (200mVPP) without any level shifting or termination resistor networks in the signal path. The outputs are LVDS-compatible with fast rise/fall times guaranteed to be less than 220ps. The SY89465U operates from a 2.5V ±5% supply and is guaranteed over the full industrial temperature range of –40°C to +85°C. The SY89465U is part of Micrel’s high-speed, Precision Edge ® product line. All support documentation can be found on Micrel’s web site at: www.micrel.com. Precision Edge ® Features • Selects between two sources, and provides 10 precision LVDS copies • Guaranteed AC performance over temperature and supply voltage: – Wide operating frequency: 1kHz to >1.5GHz – <1200ps In-to-Out tpd – <220ps tr/tf • Unique, patent-pending input isolation design minimizes adjacent channel crosstalk • Fail-Safe Input prevents oscillations • Ultra-low jitter design: – 183 fsRMS phase jitter (typical) – <0.7psRMS MUX crosstalk-induced jitter • Unique patented input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS) • 325mV LVDS output swing • 2.5V ±5% supply voltage • −40°C to +85°C industrial temperature range • Output enable • Available in 44-pin (7mm x 7mm) QFN package Applications • Redundant clock switchover • Fail-safe clock protection Markets • LAN/WAN • Enterprise servers • ATE • Test and measurement |
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