SY58031U_10 Datasheet, PDF (1/9 Pages) Micrel Semiconductor – ULTRA-PRECISION 1:8 CML fanout buffer WITH INTERNAL I/O TERMINATION

Micrel, Inc.
ULTRA-PRECISION 1:8
CML fanout buffer WITH
INTERNAL I/O TERMINATION
Precision Edge^®
Precision E^Sd^Y5g⁸e^0®31U
SY58031U
FEATURES
■ Precision 1:8, 400mV CML fanout buffer
■ Guaranteed AC performance over temperature and
voltage:
• Clock frequency range:  DC to >6GHz
• <60ps t_r / t_f time
• <270ps t_pd
• <20ps ouput-to-output skew
■ Low-jitter performance:
• 75fs_RMS phase jitter (typ)
■ 50Ω source-terminated CML outputs
■ 400mV CML output swing into 50Ω load
■ Fully differential I/O
■ Accepts an input signal as low as 100mV
■ Unique, patent-pending input termination and VT
pin accepts DC-coupled and AC-coupled differential
inputs: (LVPECL, LVDS, and CML)
■ Power supply 2.5V ±5% or 3.3V ±10%
■ Industrial temperature range:  –40°C to +85°C
■ Available in 32-pin (5mm x 5mm) MLF^® package
APPLICATIONS
Precision Edge^®
DESCRIPTION
The SY58031U is a 2.5V/3.3V precision, high-speed,
fully differential CML 1:8 fanout buffer. The SY58031U is
optimized to provide eight identical output copies with less
than 20ps of skew and only 75fs_RMS phase jitter. It can
process clock signals as fast as 6GHz.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows the SY58031U to directly
interface to CML, LVPECL, and LVDS differential signals
(AC- or DC-coupled) without any level-shifting or termination
resistor networks in the signal path. The result is a clean,
stub-free, low-jitter interface solution. The CML outputs
feature 400mV typical swing into 50Ω loads and provide
an extremely fast rise/fall time guaranteed to be less than
60ps.
The SY58031U 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 high-speed 1:8 LVPECL fanout buffers, consider the
SY58032U and SY58033U. The SY58031U 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.
Functional block diagram
■ All SONET and all GigE clock distribution
■ All Fibre Channel clock and data distribution
■ Network routing engine timing distribution
■ High-end, low-skew multiprocessor synchronous
clock distribution
IN
50Ω
V_T
50Ω
/IN
V_REF-AC
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]
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Rev.: E Amendment: /0
Issue Date: July 2010