SY89858U_10 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – Precision Low Power 1:8 LVPECL

SY89858U
Precision Low Power 1:8 LVPECL
Fanout Buffer with Internal Termination
General Description
The SY89858U is a 2.5V/3.3V precision, high-
speed, fully differential LVPECL 1:8 fanout buffer
optimized to provide eight identical output copies
with less than 30ps of skew and less than 10ps_pp
total jitter. It can process clock signals as fast as
2.0GHz.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that allows the
SY89858U to directly interface to LVPECL, CML,
and LVDS differential signals (AC- or DC-coupled)
as small as 100mV without any level shifting or
termination resistor networks in the signal path. The
result is a clean, stub-free, low-jitter interface
solution. The LVPECL (100k temperature
compensated) outputs feature 800mV typical swing
into 50Ω loads, and provide fast rise/fall times
guaranteed to be less than 200ps.
The SY89858U operates from a 2.5V ±5% supply or
3.3V ±10% supply and is guaranteed over the full
industrial temperature range of –40°C to +85°C. For
applications that require a higher speed fanout
buffer, consider the SY58032U. The SY89858U 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.
Features
Precision Edge^®
• Precision 1:8, LVPECL fanout buffer
• Low power: 238mW (2.5V)
• Guaranteed AC performance over temperature
and supply voltage:
– Wide operating frequency: DC to 2.0GHz
– <380ps In-to-Out t_pd
– <200ps t_r/t_f
– <30ps skew
• Ultra-low jitter design:
– <1ps_RMS random jitter
– <1ps_RMS cycle-to-cycle jitter
– <10ps_PPtotal jitter
• 100k LVPECL compatible outputs
• Fully differential inputs/outputs
• Accepts an input signal as low as 100mV
(200mV_pp)
• 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%
• -40°C to +85°C industrial temperature range
• Available in 32-pin (5mm x 5mm) QFN package
Applications
• All SONET and GigE clock distribution
• All Fibre Channel clock and data distribution
• Network routing engine timing distribution
• High-end, low-skew multiprocessor synchronous
clock distribution
Markets
• LAN/WAN
• Enterprise servers
• ATE
• Test and measurement
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 2007
M9999-082907-C
[e-mail] or [phone]