SY89858U
Precision Low Power 1:8 LVPECL Fanout
Buffer with Internal Termination
General Description
The SY89858U is a 2.5V/3.3V precision, high-
speed, fully differential LVPECL 1:8 fanout buffer
optimized to provide eight identical output copies
with less than 30ps of skew and less than 10ps
pp
total jitter. It can process clock signals as fast as
2.0GHz.
The differential input includes Micrel鈥檚 unique, 3-pin
input termination architecture that allows the
SY89858U to directly interface to LVPECL, CML,
and LVDS differential signals (AC- or DC-coupled)
as small as 100mV without any level shifting or
termination resistor networks in the signal path. The
result is a clean, stub-free, low-jitter interface
solution. The LVPECL (100k temperature
compensated) outputs feature 800mV typical swing
into 50
loads, and provide fast rise/fall times
guaranteed to be less than 200ps.
The SY89858U operates from a 2.5V 鹵5% supply or
3.3V 鹵10% supply and is guaranteed over the full
industrial temperature range of 鈥?0擄C to +85擄C. For
applications that require a higher speed fanout
buffer, consider the SY58032U. The SY89858U is
part of Micrel鈥檚 high-speed, Precision Edge鈩?/div>
product line. All support documentation can be found
on Micrel鈥檚 web site at: www.micrel.com.
Precision Edge鈩?/div>
Features
鈥?/div>
Precision 1:8, LVPECL fanout buffer
鈥?/div>
Low power: 238mW (2.5V)
鈥?/div>
Guaranteed AC performance over temperature
and supply voltage:
鈥?Wide operating frequency: DC to 2.0GHz
鈥?<380ps In-to-Out t
pd
鈥?<200ps t
r
/t
f
鈥?<30ps skew
鈥?/div>
Ultra-low jitter design:
鈥?<1ps
rms
random jitter
鈥?<1ps
rms
cycle-to-cycle jitter
鈥?<10ps
pk-pk
total jitter
鈥?/div>
100k LVPECL compatible outputs
鈥?/div>
Fully differential inputs/outputs
鈥?/div>
Accepts an input signal as low as 100mV
(200mV
pp
)
鈥?/div>
Unique patent pending input termination and VT
pin accepts DC-coupled and AC-coupled
differential inputs (LVPECL, LVDS, and CML)
鈥?/div>
Power supply 2.5V +5% or 3.3V +10%
鈥?/div>
鈥?0擄C to +85擄C industrial temperature range
鈥?/div>
Available in 32-pin (5mm x 5mm) MLF鈩?package
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
All SONET and GigE clock distribution
All Fibre Channel clock and data distribution
Network routing engine timing distribution
High-end, low-skew multiprocessor synchronous
clock distribution
Markets
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Precision Edge is a trademark of Micrel, Inc
MicroLeadFrame
and MLF are trademarks of Amkor Technology, Inc.
LAN/WAN
Enterprise servers
ATE
Test and measurement
November 2004
M9999-110804
hbwhelp@micrel.com
or (408) 955-1690
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