SY89856U Datasheet, PDF (1/11 Pages) Micrel Semiconductor – 2GHz, Low-Power, 1:6 LVPECL Fanout Buffer with 2:1 Input MUX and Internal Termination

SY89856U
2GHz, Low-Power, 1:6 LVPECL Fanout Buffer
with 2:1 Input MUX and Internal Termination
General Description
The SY89856U is a 2.5V/3.3V precision, high-
speed, 1:6 fanout capable of handling clocks up to
2.0GHz. A differential 2:1 MUX input is included for
redundant clock switchover applications.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that allows the device
to interface to any differential signal (AC- or DC-
coupled) as small as 100mV (200mV_pp) without any
level shifting or termination resistor networks in the
signal path. The outputs are LVPECL (100k,
temperature compensated), with extremely fast
rise/fall times guaranteed to be less than 200ps.
The SY89856U operates from a 2.5V ±5% supply or
a 3.3V ±10% supply and is guaranteed over the full
industrial temperature range of –40°C to +85°C. The
SY89856U 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.
Functional Block Diagram
Features
Precision Edge^®
• 6 ultra-low skew copies of the selected input
• 2:1 MUX input included for clock switchover
applications
• Low power: 225mW typical (2.5V)
• 2.5V to 3.3V supply voltage
• Unique input isolation design minimizes crosstalk
• Guaranteed AC performance over temperature
and voltage:
– Clock frequency range: DC to >2.0GHz
– <400ps IN-to-OUT t_pd
– <200ps t_r/t_f times
– <30ps skew (output-to-output)
• Ultra-low jitter design:
– <1ps_RMS random jitter
– <10ps_PP total jitter (clock)
– <1ps_RMS cycle-to-cycle jitter
– <0.7ps_RMS crosstalk-induced jitter
• Unique input termination and VT pin accepts DC-
and AC-coupled inputs (CML, PECL, LVDS)
• 100k LVPECL compatible output swing
• –40°C to +85°C industrial temperature range
• Available in 32-pin (5mm x 5mm) MLF^® package
Applications
• Redundant clock distribution
• All SONET/SDH clock/data distribution
• All Fibre Channel distribution
• All Gigabit Ethernet clock distribution
Markets
Precision Edge is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame registered are trademarks of Amkor Technology.
• LAN/WAN
• Enterprise servers
• ATE
• Test and measurement
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
February 2007
M9999-022007-B
[e-mail] or [phone]