SY58021U_10 Datasheet, PDF (1/13 Pages) Micrel Semiconductor – 4GHz, 1:4 LVPECL Fanout Buffer/Translator with Internal Termination Precision Edge

SY58021U
4GHz, 1:4 LVPECL Fanout
Buffer/Translator with Internal Termination
Precision Edge^®
General 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 output
skew and only 70 fs_RMS phase 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 )
REFAC
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.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
Precision Edge^®
• 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 maximum skew
• Low jitter performance:
− 70fs_RMS phase jitter (typical)
• 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) QFN package
Applications
• All SONET and GigE clock distribution
• Fibre Channel clock and data distribution
• Backplane distribution
• High-end, low-skew, multiprocessor, synchronous clock
distribution
Precision Edge is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
August 2010
M9999-080510-A
[e-mail] or [phone]