SY58020U Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 6GHz, 1:4 CML FANOUT BUFFER/TRANSLATOR WITH INTERNAL I/O TERMINATION

Micrel
6GHz, 1:4 CML FANOUT
BUFFER/TRANSLATOR WITH
INTERNAL I/O TERMINATION
Precision Edge™
Precision Ed^Sg^Ye⁵⁸™^020U
SY58020U
FEATURES
Precision 1:4, 400mV CML fanout buffer
Guaranteed AC performance over temperature/
voltage:
• > 6GHz f_MAX clock
• < 60ps t_r / t_f times
• < 250ps t_pd
• < 15ps max. skew
Low jitter performance:
• < 10ps_(pk-pk) total jitter (clock)
• < 1ps_(rms) random jitter (data)
• < 10ps_(pk-pk) deterministic jitter (data)
Accepts an input signal as low as 100mV
Unique input termination and V_T pin accepts
DC-coupled and AC-coupled differential
inputs: LVPECL, LVDS, and CML
50Ω source terminated CML outputs
Power supply 2.5V ±5% and 3.3V ±10%
Industrial temperature range: –40°C to +85°C
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 Data distribution: OC-48, OC-48+FEC, XAUI
s High-end, low skew, multiprocessor synchronous
clock distribution
FUNCTIONAL BLOCK DIAGRAM
Precision Edge™
DESCRIPTION
The SY58020U is a 2.5V/3.3V precision, high-speed, fully
differential 1:4 CML fanout buffer. Optimized to provide four
identical output copies with less than 15ps of skew and less
than 10ps_(pk-pk) total jitter, the SY58020U can process clock
signals as fast as 6GHz.
The differential input includes Micrel’s unique, 3-pin input
termination architecture interfaces to differential LVPECL,
LVDS, and CML signals (AC-coupled 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 V_T pin. The outputs are
optimized to drive 400mV typical swing into 50Ω loads, with
extremely fast rise/fall times guaranteed to be less than
60ps.
The SY58020U 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 LVPECL outputs, consider the SY58021U or
SY58022U 1:4 fanout buffer with 800mV and 400mV output
swing, respectively. The SY58020U is part of Micrel’s high-
speed, Precision Edge™ product line. Data sheets and
support documentation can be found on Micrel’s web site at
www.micrel.com.
TYPICAL PERFORMANCE
IN
50Ω
V_T
50Ω
/IN
V_REF-AC
Q0
2GHz Output
/Q0
Q1
/Q1
Q2
/Q2
Q3
/Q3
Precision Edge is a trademark of Micrel, Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
1
TIME (70ps/div.)
Rev.: A Amendment: /0
Issue Date: July 2003