1
M9999-072810
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
■Precision 1:8, 400mV LVPECL fanout buffer
■Low-jitter performance:
• 76fsRMS phase jitter (typ)
■Guaranteed AC performance over temperature and
voltage:
• Clockfrequencyrange: DCto5.5GHz
• <80pstr / tf times
• <280pstpd
• <20psskew
■100kLVPECLcompatibleoutputs
■Fully differential inputs/outputs
■Accepts an input signal as low as 100mV
■UniqueinputterminationandVT pin accepts
DC-coupled and AC-coupled differential inputs:
(LVPECL, LVDS, and CML)
■Powersupply2.5V±5%or3.3V±10%
■Industrial temperature range: –40°C to +85°C
■Availablein32-pin(5mmx5mm)QFNPackage
FEATURES
ULTRA-PRECISION 1:8 FANOUT
BUFFER 400mV LVPECL OUTPUTS WITH
AND INTERNAL TERMINATION
Precision Edge®
SY58033U
APPLICATIONS
■AllSONETandallGigEclockdistribution
■AllFibreChannelclockanddatadistribution
■Networkroutingenginetimingdistribution
■High-end,low-skewmultiprocessorsynchronous
clockdistribution
Rev.: F Amendment: /0
Issue Date: October 2011
The SY58033U is a 2.5V/3.3V precision, high-speed, fully
differential 400mV LVPECL 1:8 fanout buffer. The SY58033U
is optimized to provide eight identical output copies with
less than 20ps of skew and only 76fsRMS phase jitter. It can
process clock signals as fast as 5.5GHz.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows the SY58033U to directly
interface to LVPECL, CML, and LVDS differential signal
(AC- or DC-coupled) without any level-shifting or termination
resistor networks in the signal path. The result is a clean,
stub-free, low-jitter solution. The LVPECL (100k temperature
compensated) outputs feature a 400mV typical swing into
50 ohms loads, and provide an extremely fast rise/fall time
guaranteed to be less than 80ps.
The SY58033U 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). Other high-speed 1:8
fanout buffers include the CML SY58031U and the 800mV
LVPECL SY58032U. The SY58033U 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
Precision Edge®
Precision Edge is a registered trademark of Micrel, Inc.
