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SY89112U

2.5/3.3V Low-Jitter, Low-Skew 1:12 LVPECL

Fanout Buer with 2:1 Input MUX and

Internal Termination

Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 9440800 • fax + 1 (408) 4741000 • San --http://www.micrel.com

April 8, 2014

0-6.0 40814

hbwhelp@micrel.com or (408) 955-1690

General Description

The SY89112U is a low-jitter, low-skew, high-speed

LVPECL 1:12 dierential fanout buer 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 “runt”

clock pulses.

The SY89112U differential input includes Micrel’s unique,

patent-pending 3-pin input termination architecture that

directly interfaces to any dierential 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 40°C to +85°C. The SY89112U is –

part of Micrel’s high-speed, Precision Edge® product line.

Datasheets and support documentation are available on

Micrel’s web site at: . www.micrel.com

Features

Selects between 1 of 2 inputs, and provides 12

precision, low skew LVPECL output copies

Guaranteed AC performance over temperature and

voltage:

DC to >2GHz throughput

<550ps propagation delay CLK--toQ

<220ps rise/fall time

<25ps output--output skewto

Ultra-low jitter design:

50fsRMS phase jitter (typ.)

<0.7psRMS crosstalk induced jitter

Unique, patent-pending input termination and VT pin

accepts DC-coupled and AC-coupled dierential inputs

Unique, patent-pending 2:1 input MUX provides superior

isolation to minimize channel--channel crosstalkto

800mV, 100K LVPECL output swing

Power supply 2.5V +5% or 3.3V +10%

Industrial temperature range 40°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.

Produktspecifikationer