SY58020U_14 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – 6GHz, 1:4 CML Fanout Buffer/Translator with Internal I/O Termination

SY58020U
6GHz, 1:4 CML Fanout Buffer/Translator
with Internal I/O Termination
General Description
The SY58020U is a 2.5V/3.3V precision, high-speed, fully
differential 1:4 CML fanout buffer. Optimized to provide
four identical output copies with less than 15ps of skew
and 27fs_RMS of typical additive phase jitter, the SY58020U
can process clock signals as fast as 6GHz.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that interfaces to differential
LVPECL, LVDS, and CML signals (AC- or DC-coupled) as
small as 100mV without any level-shifting or termination
resistor networks in the signal path. For AC-coupled input
interface applications, an on-board output reference
voltage (V_REF-AC) is provided to bias the V_T pin. The outputs
are optimized to drive 400mV typical swing into 50Ω loads,
with extremely fast rise/fall times guaranteed to be less
than 60ps.
The SY58020U operates from a 2.5V ±5% supply or 3.3V
±10% supply and is guaranteed over the full industrial
temperature range (–40°C to +85°C). For applications that
require LVPECL outputs, consider the SY58021U or
SY58022U 1:4 fanout buffer with 800mV and 400mV
output swing, respectively. The SY58020U is part of
Micrel’s high-speed, Precision Edge^® product line.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• Precision 1:4, 400mV CML fanout buffer
• Guaranteed AC performance over temperature/voltage:
− > 6GHz f_MAX clock
− < 60ps t_r / t_f times
− < 250ps t_pd
− < 15ps max. skew
• Low-jitter performance:
− 27fs_RMS typical additive phase jitter
• Accepts an input signal as low as 100mV
• Unique patented input termination and V_T pin accepts
DC-coupled and AC-coupled differential inputs:
LVPECL, LVDS, and CML
• 50Ω source terminated CML outputs
• Power supply 2.5V ±5% and 3.3V ±10%
• Industrial temperature range: –40°C to +85°C
• Available in 16-pin (3mm x 3mm) QFN package
Applications
• All SONET and All GigE clock distribution
• Fibre Channel clock and data distribution
• Backplane distribution
• Data distribution: OC-48, OC-48+FEC, XAUI
• High-end, low skew, multiprocessor synchronous clock
distribution
Functional Block Diagram
Typical Performance
Precision Edge is a trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
October 27, 2014
Revision 5.0
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