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鈥檚 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 鹵5% or 3.3V
鹵10% supply and is guaranteed over the full industrial
temperature range of 鈥?0擄C to +85擄C. The SY89473U is
part of Micrel鈥檚 high-speed, Precision Edge
廬
product
line. For multiple-clock switchover solutions, please refer
to the SY89840鈥揝Y89843U family.
All support documentation can be found on Micrel鈥檚 web
site at:
www.micrel.com.
Precision Edge
廬
Features
鈥?/div>
Selects between two input channels and provides two
copies of the selected output
鈥?/div>
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
鈥?/div>
Unique patented input isolation design minimizes
crosstalk
鈥?/div>
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
鈥?/div>
Unique patent-pending input termination and VT pin
accepts DC- and AC-coupled inputs (CML, PECL,
LVDS)
鈥?/div>
800mV (100K) LVPECL output swing
鈥?/div>
2.5V 鹵5% or 3.3V 鹵10% supply voltage
鈥?/div>
-40擄C to +85擄C industrial temperature range
鈥?/div>
Available in 24-pin (4mm x 4mm) MLF
TM
package
Functional Block Diagram
Applications
鈥?/div>
Clock switchover
鈥?/div>
Data distribution
Markets
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Precision Edge is a registered trademark of Micrel, Inc.
MLF and
MicroLeadFrame
are trademarks of Amkor Technology, Inc.
Micrel Inc. 鈥?2180 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel +1 (408) 944-0800 鈥?fax + 1 (408) 474-1000 鈥?http://www.micrel.com
LAN/WAN
Enterprise servers
ATE
Test and measurement
May 2005
M9999-052405
hbwhelp@micrel.com
or (408) 955-1690
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