Micrel, Inc.
Precision Edge®
SY58035U
®
4.5GHz, 1:6 LVPECL Fanout
Buffer WITH 2:1 MUX Input
AND INTERNAL TERMINATION
Precision Edge
SY58035U
FEATURES
■ Provides six ultra-low skew copies of the selected
input
■ 2:1 MUX input included for clock switchover
applications
■ Guaranteed AC performance over temperature and
voltage:
•
Clock frequency range: DC to > 4.5GHz
•
<320ps IN-to-OUT tpd
•
<110ps tr / tf times
•
<20ps skew (output-to-output)
■ Ultra-low jitter design:
• 50fsRMS phase jitter (typ)
■ Low supply voltage operation: 2.5V and 3.3V
■ Unique input termination and VT pin accepts DCcoupled and AC-coupled inputs (CML, PECL, LVDS)
■ Unique input isolation design minimizes crosstalk
■ 100K LVPECL compatible output swing
■ –40°C to +85°C temperature range
■ Available in 32-pin (5mm x 5mm) MLF® package
Precision Edge®
DESCRIPTION
The SY58035U is a 2.5V/3.3V precision, high-speed, 1:6
fanout capable of handling clocks up to 4.5GHz. A differential
2:1 MUX input is included for redundant clock switchover
applications.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows the device to interface
to any differential signal (AC- or DC-coupled) as small as
100mV without any level shifting or termination resistor
networks in the signal path. The outputs are LVPECL (100K,
temperature compensated), with extremely fast rise/fall times
guaranteed to be less than 110ps.
The SY58035U 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. For applications that
require CML outputs, consider the SY58034U or for 400mV
LVPECL outputs the SY58036U. The SY58035U 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.
APPLICATIONS
■
■
■
■
Functional block diagram
Redundant clock distribution
All SONET/SDH clock/data distribution
All Fibre Channel distribution
All Gigabit Ethernet clock distribution
1:6 Fanout
Q0
/Q0
2:1 Mux
IN0
Q1
50Ω
VT0
50Ω
/Q1
0
Q2
/IN0
VREF-AC0
Mux
/Q2
S
Q3
IN1
50Ω
VT1
50Ω
1
/Q3
/IN1
Q4
VREF-AC1
/Q4
SEL
(TTL/CMOS)
Q5
/Q5
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.
M9999-073010
hbwhelp@micrel.com or (408) 955-1690
1
Rev.: F
Amendment: /0
Issue Date: July 2010
