SY89474UMG Datasheet, PDF (1/11 Pages) Micrel Semiconductor – Precision LVDS 2:1 Multiplexer with 1 2 Fanout and Internal Termination

SY89474U
Precision LVDS 2:1 Multiplexer with 1:2
Fanout and Internal Termination
General Description
The SY89474U is a 2.5V 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 325mV LVDS with fast rise/fall times guaranteed
to be less than 150ps.
The SY89474U operates from a 2.5V ±5% supply and is
guaranteed over the full industrial temperature range of
-40°C to +85°C. The SY89474U is part of Micrel’s high-
speed, Precision Edge^® product line. For multiple clock
switchover solutions, please refer to the SY89840U–
SY89845U family.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Functional Block Diagram
Features
®
Precision Edge
• Selects between two input channels and provides two
copies of the selected input
• Guaranteed AC performance over temperature and
supply voltage:
− DC to 2.5Gbps data throughput
− DC to 2.5GHz f_MAX (clock)
− <470ps In-to-Out tpd
− <150ps t_r/t_f
− <20ps output-to-output skew
• Unique, patent-pending input isolation design
minimizes crosstalk
• Ultra-low jitter design:
− <1ps_RMS random jitter
− <10ps_PP deterministic 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)
• 325mV LVDS output swing
• 2.5V ±5% supply voltage
• −40°C to +85°C industrial temperature range
• Available in 24-pin (4mm x 4mm) QFN package
Applications
• Clock switchover
• Data 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 2005
M9999-081105
[e-mail] or [phone]