SY55858U 2.5V/3.3V/5V 3.0GHz Dual 2 X 2 CML Crosspoint Switch w/Internal Termination0 pages

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SuperLite™
Micrel, Inc. SY55858U
M9999-110705
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
Guaranteed AC parameters over temperature:
• fMAX > 3.0GHz (3Gbps)
• tr/ tf < 120ps
• Within-device skew < 25ps
Non-blocking “switch architecture”
Configurable as dual 2:1 mux, dual 1:2 fanout buffer,
1:4 fanout buffer, quad buffer, or dual 2 x 2 switch
50Ù compatible outputs
Unique input termination and VT pin for DC-coupled
and AC-coupled input signals–CML or PECL
Fully differential inputs/outputs
TTL/CMOS compatible control logic
Wide supply voltage range: 2.3V to 3.6V
Wide operating temperature range: –40°C to +85°C
Available in 32-pin EPAD-TQFP package
The SY55858U is a low-voltage, high-speed dual 2 x 2
crosspoint switch with a flexible input that accepts CML
or PECL, and a 50Ù compatible differential CML (currentmode
logic) output. The non-blocking design allows any
input to connect to any output. Varying the state of the
select inputs allows SY55858U to be used in backup,
fault tolerant, protection and backplane distribution
applications.
The signal inputs (DA0–1 and DB0–1) have a unique
internal termination design that allows access to the
termination network through VT pins. This feature allows
the device to easily interface to other logic standards
such as AC-coupled or DC-coupled PECL/LVPECL
signals. For applications that require a single-channel
2 x 2 crosspoint, consider the SY55854.
FEATURES
2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML
CROSSPOINT SWITCH
W/INTERNAL TERMINATION
SuperLite™
SY55858U
APPLICATIONS
SONET/SDH optical transport
Backplane redundancy
Add-drop Multiplexers
Rev.: D Amendment: /0
Issue Date: November 2005
SuperLite is a trademark of Micrel, Inc.
SuperLite™