SY58035U_10 Datasheet, PDF (1/11 Pages) Micrel Semiconductor – 4.5GHz, 1:6 LVPECL FANOUT BUFFER WITH 2:1 MUX INPUT AND INTERNAL TERMINATION

Micrel, Inc.
4.5GHz, 1:6 LVPECL Fanout
Buffer WITH 2:1 MUX Input
AND INTERNAL TERMINATION
Precision Edge^®
Precision E^Sd^Y5g⁸e^0®35U
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 t_pd
• <110ps t_r / t_f times
• <20ps skew (output-to-output)
■ Ultra-low jitter design:
• 50fs_RMS phase jitter (typ)
■ Low supply voltage operation:  2.5V and 3.3V
■ Unique input termination and VT pin accepts DC-
coupled 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
DESCRIPTION
Precision Edge^®
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
IN0
50Ω
V_T0
50Ω
/IN0
V_REF-AC0
IN1
50Ω
V_T1
50Ω
/IN1
V_REF-AC1
SEL
(TTL/CMOS)
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.
M9999-073010
[e-mail] or [phone]
1
2:1 Mux
0
Mux
1S
1:6 Fanout
Q0
/Q0
Q1
/Q1
Q2
/Q2
Q3
/Q3
Q4
/Q4
Q5
/Q5
Rev.: F
Amendment: /0
Issue Date: July 2010