SY89473U Datasheet, PDF (1/11 Pages) Micrel Semiconductor – Precision LVPECL 2:1 Multiplexer with 1:2 Fanout and Internal Termination

SY89473U
Precision LVPECL 2:1 Multiplexer with 1:2
Fanout and Internal Termination
General Description
The SY89473U is a 2.5V/3.3V precision, high-speed 2:1
differential MUX capable of processing clocks up to
2.5GHz and data up to 2.5Gbps.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that directly interfaces to
any differential signal (AC- or DC-coupled) as small as
100mV (200mV_PP) without any level shifting or
termination resistor networks in the signal path. The
output is 800mV, 100K-compatible, LVPECL with fast
rise/fall times guaranteed to be less than 190ps.
The SY89473U operates from a 2.5V ±5% or 3.3V
±10% supply and is guaranteed over the full industrial
temperature range of –40°C to +85°C. The SY89473U is
part of Micrel’s high-speed, Precision Edge^® product
line. For multiple-clock switchover solutions, please refer
to the SY89840–SY89843U family.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Functional Block Diagram
Precision Edge^®
Features
• Selects between two input channels and provides two
copies of the selected output
• Guaranteed AC performance over temperature and
supply voltage:
- DC to 2.5Gbps data throughput
- DC to 2.5GHz f_MAX (clock)
- <500ps In-to-Out t_pd
- <190ps t_r/t_f
- <20ps Output-to-output skew
• Unique patented input isolation design minimizes
crosstalk
• Ultra-low Jitter Design:
- <1ps_RMS random jitter
- <1ps_RMS cycle-to-cycle jitter
- <10ps_PP total jitter (clock)
- <0.7ps_RMS crosstalk induced jitter
• Unique patent-pending input termination and VT pin
accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
• 800mV (100K) LVPECL output swing
• 2.5V ±5% or 3.3V ±10% supply voltage
• -40°C to +85°C industrial temperature range
• Available in 24-pin (4mm x 4mm) MLF^TM package
Applications
• Clock switchover
• Data distribution
Markets
• LAN/WAN
• Enterprise servers
• ATE
• Test and measurement
Precision Edge is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
May 2005
M9999-052405
[e-mail] or [phone]