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SY89112U_11 Datasheet, PDF (1/14 Pages) Micrel Semiconductor – 2.5/3.3V Low-Jitter, Low-Skew 1:12 LVPECL Fanout Buffer with 2:1 Input MUX | |||
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SY89112U
2.5/3.3V Low-Jitter, Low-Skew 1:12
LVPECL Fanout Buffer with 2:1 Input MUX
and Internal Termination
General Description
The SY89112U is a low-jitter, low-skew, high-speed
LVPECL 1:12 differential fanout buffer optimized for
precision telecom and enterprise server distribution
applications. The input includes a 2:1 MUX for clock
switchover application. Unlike other multiplexers, this input
includes a unique isolation design to minimize channel-to-
channel crosstalk. The SY89112U distributes clock
frequencies from DC to >2GHz guaranteed over
temperature and voltage. The SY89112U incorporates a
synchronous output enable (EN) so that the outputs will
only be enabled/disabled when they are already in the
LOW state. This reduces the chance of generating âruntâ
clock pulses.
The SY89112U differential input includes Micrelâs unique,
patent-pending 3-pin input termination architecture that
directly interfaces to any differential signal (AC- or DC-
coupled) as small as 100mV (200mVpp) without any level
shifting or termination resistor networks in the signal path.
For AC-coupled input interface, an on-board output
reference voltage (VREF-AC) is provided to bias the
center-tap (VT) pin. The outputs are 800mV, 100K-
compatible LVPECL with fast rise/fall times guaranteed to
be less than 220ps.
The SY89112U operates from a 2.5V ±5% or 3.3V ±10%
supply and is guaranteed over the full industrial
temperature range of â40°C to +85°C. The SY89112U is
part of Micrelâs high-speed, Precision Edge® product line.
All support documentation can be found on
Micrelâs web site at www.micrel.com.
Features
Precision Edge®
⢠Selects between 1 of 2 inputs, and provides 12
precision, low skew LVPECL output copies
⢠Guaranteed AC performance over temperature and
voltage:
â DC to >2GHz throughput
â <550ps propagation delay CLK-to-Q
â <220ps rise/fall time
â <25ps output-to-output skew
⢠Ultra-low jitter design:
â 109fsRMS phase jitter (typ.)
â <0.7psRMS crosstalk induced jitter
⢠Unique, patent-pending input termination and VT pin
accepts DC-coupled and AC-coupled differential inputs
⢠Unique, patent-pending 2:1 input MUX provides
superior isolation to minimize channel-to-channel
crosstalk
⢠800mV, 100K LVPECL output swing
⢠Power supply 2.5V +5% or 3.3V +10%
⢠Industrial temperature range â40°C to +85°C
⢠Available in 44-pin (7mm x 7mm) QFN package
Applications
⢠Multi-processor server
⢠SONET/SDH clock/data distribution
⢠Fibre Channel distribution
⢠Gigabit Ethernet clock distribution
Precision Edge is a registered trademark of Micrel, Inc
Micrel Inc. ⢠2180 Fortune Drive ⢠San Jose, CA 95131 ⢠USA ⢠tel +1 (408) 944-0800 ⢠fax + 1 (408) 474-1000 ⢠http://www.micrel.com
March 2011
M9999-030211-E
hbwhelp@micrel.com or (408) 955-1690
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