sy89840u Micrel Semiconductor, sy89840u Datasheet

sy89840u

Manufacturer Part Number

sy89840u

Description

Precision Lvpecl Runt Pulse Eliminator 2 1 Multiplexer

Manufacturer

Micrel Semiconductor

Datasheet

1.SY89840U.pdf (15 pages)

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General Description

The SY89840U is a low jitter PECL, 2:1 differential input

multiplexer (MUX) optimized for redundant source

switchover applications. Unlike standard multiplexers,

the SY89840U unique 2:1 Runt Pulse Eliminator (RPE)

MUX prevents any short cycles or “runt” pulses during

switchover. In addition, a unique Fail-Safe Input

protection prevents metastable conditions when the

selected input clock fails to a DC voltage (voltage

between the pins of the differential input drops below

100mV).

The differential input includes Micrel’s unique, 3-pin

input termination architecture that allows customers to

interface to any differential signal (AC or DC-coupled) as

small as 100mV (200mV

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 SY89840U 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 SY89840U is

part of Micrel’s high-speed, Precision Edge

line. All support documentation can be found on Micrel’s

web site at: www.micrel.com.

February 2005

Precision Edge is a registered trademark of Micrel, Inc.

MLF and MicroLeadFrame are trademarks of Amkor Technology, 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

) without any level shifting or

product

Precision LVPECL Runt Pulse Eliminator 2:1

Features

• Selects between two sources, and provides a glitch-free,

• Guaranteed AC performance over temperature and supply

• Unique patent-pending input isolation design minimizes

• Fail-safe input prevents oscillations

• Ultra-low jitter design:

• Unique patent-pending input termination and VT pin

• 800mV LVPECL output swing

• 2.5V ±5% or 3.3V ±10% supply voltage

• –40°C to +85°C industrial temperature range

• Available in 16-pin (3mm x 3mm) MLF

Applications

• Redundant clock switchover

• Failsafe clock protection

Markets

• LAN/WAN

• Enterprise servers

• ATE

• Test and measurement

stable LVPECL output

voltage:

– Wide operating frequency: 1kHz to >1.5GHz

– < 880ps In-to-Out t

– < 190ps t

crosstalk

– <1ps

– <10ps

– <0.7ps

accepts DC-coupled and AC-coupled inputs (CML,

PECL, LVDS)

rms

random jitter

cycle-to-cycle jitter

total jitter (clock)

MUX crosstalk induced jitter

SY89840U

Multiplexer

hbwhelp@micrel.com

Precision Edge

or (408) 955-1690

™

M9999-021705

package

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