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SY89465U Datasheet(PDF) 1 Page - Micrel Semiconductor

Part No. SY89465U
Description  Precision LVDS 1:10 Fanout with 2:1 Runt Pulse Eliminator MUX and Internal Termination
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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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.
MLF and MicroLeadFrame are 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 • http://www.micrel.com
December 2005
M9999-120105-A
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:
– <1psRMS random jitter
– <1psRMS cycle-to-cycle jitter
– <10psPP total jitter (clock)
– <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) MLF™ package
Applications
• Redundant clock switchover
• Fail-safe clock protection
Markets
• LAN/WAN
• Enterprise servers
• ATE
• Test and measurement




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