Microchip SY89840U Handleiding

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SY89840U

Precision LVPECL Runt Pulse Eliminator 2:1

Multiplexer

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

Oct. 1, 2013

M9999-021705

[email protected] or (408) 955-1690

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

pp

) without any level shifting or

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

®

product

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

web site at: www.micrel.com.

Precision Edge

®

Features

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

stable LVPECL output

Guaranteed AC performance over temperature and supply

voltage:

–Wide operating frequency: 1kHz to >1.5GHz

–< 880ps In-to-Out t

pd

–< 190ps t

r

/t

f

Unique patent-pending input isolation design minimizes

crosstalk

Fail-safe input prevents oscillations

Ultra-low jitter design:

–140fs RMS phase jitter (Typ)

–0.7ps

rms

MUX crosstalk induced jitter

Unique patent-pending input termination and VT pin

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

PECL, LVDS)

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) QFN package

Applications

Redundant clock switchover

Failsafe clock protection

Markets

LAN/WAN

Enterprise servers

ATE

Test and measurement

Precision Edge is a registered trademark of Micrel, Inc.

Product specificaties