sy89112u Micrel Semiconductor, sy89112u Datasheet

sy89112u

Manufacturer Part Number

sy89112u

Description

2.5/3.3v Low Jitter, Low Skew 1 12 Lvpecl Fanout Buffer With 2 1 Input Mux And Internal Termination

Manufacturer

Micrel Semiconductor

Datasheet

1.SY89112U.pdf (13 pages)

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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

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 differential

signal (AC- or DC-coupled) as small as 100mV

(200mV

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

All support documentation can be found on

Micrel’s web site at

January 2008

Precision Edge is a registered trademark of Micrel, Inc

MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.

product line.

) without any level shifting or termination

www.micrel.com.

crosstalk.

The

SY89112U

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

Fanout Buffer with 2:1 Input MUX and

Features

• Selects between 1 of 2 inputs, and provides 12

• Guaranteed AC performance over temperature

• Ultra-low jitter design:

• Unique, patent-pending input termination and VT

• Unique, patent-pending 2:1 input MUX provides

• 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) MLF

Applications

• Multi-processor server

• SONET/SDH clock/data distribution

• Fibre Channel distribution

• Gigabit Ethernet clock distribution

precision, low skew LVPECL output copies

and voltage:

– DC to >2GHz throughput

– <550ps propagation delay CLK-to-Q

– <220ps rise/fall time

– <25ps output-to-output skew

– <1ps

– <10ps

– <1ps

– <0.7ps

pin accepts DC-coupled and AC-coupled

differential inputs

superior isolation to minimize channel-to-channel

crosstalk

Internal Termination

RMS

SY89112U

cycle-to-cycle jitter

total jitter (clock)

random jitter

hbwhelp@micrel.com

crosstalk induced jitter

Precision Edge

M9999-012908-B

or (408) 955-1690

package

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