Microchip SY89838U Handleiding

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SY89838U

Precision 1:8 LVDS Clock Fanout Buffer

with 2:1 Runt Pulse Eliminator Input MUX

May2008 M9999-051308-D

hbwhelp@micrel.comor (408) 955-1690

General Description

The

SY89838U is a low jitter, low skew, high-speed

1:8 fanout buffer with a unique, 2:1 differential input

multiplexer (MUX) optimized for redundant source

switchover applications. Unlike standard multiplexers,

the SY89838U 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 ofthe differential input drops below

200mV). The SY89838U distributes clock frequencies

from 1kHz to 1.5GHz, guaranteed, over temperature

and voltage.

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 200mV (400Mv

PP

) without any level

shifting or termination resistor networks in the signal

path. The outputs are 350mV compatible LVDSwith

fast rise/fall times guaranteed to be less than 150ps.

The SY89838U operates from a 2.5V ±5% supply and

is guaranteed over the full industrial temperature range

of –40°C to +85°C. For applications that require

800mV LVPECL outputs, consider the SY89837U. The

SY89838U 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 clocks, and provides 8

precision, low skew LVDS output copies

•2:1 MUX input provides a glitch-free, stable LVDS

output

•Guaranteed AC performance over temperature and

supply voltage:

–Wide operating frequency: 1kHz to >1.5GHz

–<150ps t

r

/t

f

–<40

ps output-to-output skew

•Unique patent-pending input isolation design

minimizes crosstalk

•Fail-safe input prevents oscillation

•Ultra-low jitter design:

–150fs RMS phase jitter

–<0.7ps

RMS

MUX crosstalk induced jitter

•Unique patent-pending input termination and VT pin

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

LVDS)

•350mV LVDS output swing

•Power supply 2.5V +5%

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

•Available in 32-pin (5mm x 5mm) QFN package

Applications

•Redundant clock switchover

•Failsafe clock protection

Markets

•LAN/WAN

•Enterprise Servers

•ATE

•Test and Measurements

Precision Edge is a registered trademark ofMicrel, Inc

Product specificaties