SY89855U_10 Datasheet, PDF (1/13 Pages) Micrel Semiconductor – Precision Low Power Differential LVPECL 4:1

SY89855U
Precision Low Power Differential LVPECL 4:1
MUX with 1:2 Fanout and Internal
Termination
General Description
The SY89855U is a 2.5V/3.3V precision, high-speed,
4:1 differential multiplexer with 100K LVPECL (800mV)
compatible outputs, capable of handling clocks up to
2.5GHz and data streams up to 2.5Gbps. In addition, a
1:2 fanout buffer provides two copies of the selected
inputs.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that allows customers to
interface to any differential signal (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 outputs are 800mV LVPECL, (100K temperature
compensated) with fast rise/fall times guaranteed to be
less than 180ps.
The SY89855U operates from a 2.5V ±5% supply or a
3.3V ±10% supply and is guaranteed over the full
industrial temperature range of –40°C to +85°C. For
applications that require higher performance, consider
the SY58029U. The SY89855U 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
Features
Precision Edge^®
• Select 1 of 4 differential inputs
• Provides two copies of the selected input
• Low power 260mW (V_CC = 2.5V)
• Guaranteed AC performance over temperature and
voltage:
– DC-to->2.5Gbps data rate throughput
– <410ps In-to-Q t_pd
– <180ps t_r / t_f times
• Ultra low-jitter design:
– <10ps_PP total jitter (clock)
– <1ps_RMS random jitter
– <10ps_PP deterministic jitter
– <0.7ps_RMS crosstalk-induced jitter
• Unique, patent-pending input design minimizes
crosstalk
• Accepts an input signal as low as 100mV
• Unique patented input termination and VT pin
accepts DC- and AC-coupled inputs (CML, LVPECL,
LVDS)
• 800mV 100K LVPECL output swing
• Power supply 2.5V ±5% or 3.3V ±10%
• –40°C to +85°C temperature range
• Available in 32-pin (5mm x 5mm) QFN package
Applications
• Redundant clock and/or data distribution
• All SONET/OC-3 to OC-48 clock/data distribution
• Loopback
• All Fibre Channel applications
• All GigE applications
Markets
• LAN/WAN communication
• 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]