SY58021U Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 4GHz, 1:4 LVPECL FANOUT BUFFER/ TRANSLATOR WITH INTERNAL TERMINATION

Micrel, Inc.
4GHz, 1:4 LVPECL FANOUT
BUFFER/ TRANSLATOR
WITH INTERNAL TERMINATION
Precision Edge^®
Precision E^Sd^Y5g⁸e^0®21U
SY58021U
FEATURES
Precision 1:4, LVPECL fanout buffer
Guaranteed AC performance over temperature/
voltage:
• >4GHz f_MAX (clock)
• <100ps t_r / t_f Times
• <300ps t_pd
• <15ps max skew
Low jitter performance
• <10ps_pp total jitter (clock)
• <1ps_rms random jitter (data)
• <10ps_pp deterministic jitter (data)
Accepts an input signal as low as 100mV
Unique input termination and VT pin accepts
DC-coupled and AC-coupled differential inputs:
LVPECL, LVDS, and CML
100k LVPECL compatible 800mV swing output
Power supply 2.5V ±5% and 3.3V ±10%
–40°C to +85°C temperature range
Available in 16-pin (3mm × 3mm) MLF™ package
APPLICATIONS
s All SONET and All GigE clock distribution
s Fibre Channel clock and data distribution
s Backplane distribution
s High-end, low skew, multiprocessor synchronous
clock distribution
FUNCTIONAL BLOCK DIAGRAM
Precision Edge^®
DESCRIPTION
The SY58021U 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 15ps of skew and
less than 10ps_pp total jitter, the SY58021U can process
clock signals as fast as 4GHz.
The differential input includes Micrel’s unique, 3-pin input
termination architecture interfaces to differential LVPECL,
CML, and LVDS signals (AC- or DC-coupled) as small as
100mV without any level-shifting or termination resistor
networks in the signal path. For AC-coupled input interface
applications, an on-board output reference voltage (V_REF-
AC^{) is provided to bias the VT pin. The outputs are 100k}
LVPECL compatible, with extremely fast rise/fall times
guaranteed to be less than 100ps.
The SY58021U 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). For applications that
require faster rise/fall times, or greater bandwidth, consider
the SY58022U 1:4 fanout buffer with 400mV LVPECL output
swing, or the SY58020U 1:4 CML fanout buffer. The
SY58021U 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 PERFORMANCE
IN
Q0
50Ω
/Q0
V_T
50Ω
/IN
Q1
V_REF-AC
/Q1
Q2
/Q2
Q3
/Q3
Precision Edge is a registered trademark of Micrel , Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
M9999-062405
[e-mail] or [phone]
1
1.25GHz Output
TIME (100ps/div.)
Rev.: D Amendment: /0
Issue Date: June 2005