SY89854U Datasheet, PDF (1/13 Pages) Micrel Semiconductor – Precision Low Power 1:4 LVPECL Fanout Buffer/Translator with Internal Termination

SY89854U
Precision Low Power 1:4 LVPECL Fanout
Buffer/Translator with Internal Termination
General Description
The SY89854U is a 2.5V/3.3V precision, high-
speed, fully differential 1:4 LVPECL fanout buffer.
Optimized to provide four identical output copies
with less than 20ps of skew and less than 10ps_(pp)
total jitter, the SY89854U can process clock signals
as fast as 2GHz.
The differential input includes Micrel’s unique, patent
pending 3-pin input termination architecture that
interfaces 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. For AC-coupled input interface
applications, an on-board output reference voltage
(VREF-AC) is provided to bias the center-tap (VT)
pin. The outputs are 800mV LVPECL, with fast
rise/fall times guaranteed to be less than 180ps.
The SY89854U 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 SY89854U 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.
Typical Applications
200MHz (Q - /Q)
Features
Precision Edge^®
• Precision 1:4, LVPECL fanout buffer
• Low power: 137mW (2.5V typ)
• Guaranteed AC performance over temperature
and supply voltage:
– DC- to > 2GHz Clock f_MAX
– <340ps t_pd
– <180ps t_r/t_f time
– <20ps max. skew
• Ultra-low jitter design:
– <1ps_(rms) random jitter
– <10ps_(pp) deterministic jitter
– <10ps_(pp) total jitter (clock)
• Unique patent pending input termination and VT
pin accepts DC-coupled and AC-coupled inputs
(CML, PECL, LVDS)
• Typical 800mV (100k) LVPECL output swing
• Power supply 2.5V ±5% or 3.3V ±10%
• Industrial temperature range –40°C to +85°C
• Available in ultra-small (3mm x 3mm) 16-pin
MLF™ package
Applications
• SONET and All GigE clock distribution
• Fibre Channel clock and data distribution
• Backplane distribution
TIME (600ps/dvi.)
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
June 2005
M9999-060905
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