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SY58020U

Micrel Semiconductor
Part Number SY58020U
Manufacturer Micrel Semiconductor
Description 1:4 CML Fanout Buffer/Translator
Published Nov 10, 2006
Detailed Description SY58020U 6GHz, 1:4 CML Fanout Buffer/Translator with Internal I/O Termination General Description The SY58020U is a 2.5...
Datasheet PDF File SY58020U PDF File

SY58020U
SY58020U

Overview
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 27fsRMS 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 (VREF-AC) is provided to bias the VT 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 fMAX clock − < 60ps tr / tf times − < 250ps tpd − < 15ps max.
skew • Low-jitter performance: − 27fsRMS typical additive phase jitter • Accepts an input signal as low as 100mV • Unique patented input termination and VT 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 • F...


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