Instrukcja obsługi Microchip SY89845U

Przeczytaj poniżej 📖 instrukcję obsługi w języku polskim dla Microchip SY89845U (18 stron) w kategorii nieskategoryzowany. Ta instrukcja była pomocna dla 48 osób i została oceniona przez 4 użytkowników na średnio 4.5 gwiazdek

SY89845U

Precision CML Runt Pulse Eliminator 2:1 MUX

with 1:2 Fanout and Internal Termination

Precision Edge is a registered trademark of Micrel, Inc.

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

May

2005M9999 524-0

05

hbwhelp@micrel.com-or (408) 955

1690

General Description

The SY89845U is a low jitter CML, 2:1 differential

input multiplexer (MUX) optimized for redundant

source switchover applications. Unlike standard

multiplexers, the SY89845U unique 2:1 Runt Pulse

Eliminator (RPE) MUX prvents any short cycles or e

“runt” pulses during switchover. In adition, a unique d

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 inteface to any differential signal (ACor DCr- -

coupled) as small as 100mV (200mVPP ) without any

level shifting or termintion resistor networks in the a

signal path. The ouputs are 400mV CML with fast t

rise/fall times guaranteed to be less than 80ps.

The SY89845U operates from a 2.5V ±5% or 3.3V

±10% supply and is guaranteed over the full

industrial temperture range of 40°C to +85°C. The a–

SY89845U is partspeed, Precision -of Micrel’s high

Edge ® product line.

All supiport documentation can be found on Mcrel’s

web site at: www.micrel.com.

Precision Edge®

Features

•Selects between two sources, and provides a glitch-

free, stable CML output

•Guaranteed AC performance over temperature and

supply voltage:

–Wide operating frequency: 1kHz to >1.5GHz

–--< 840ps IntoOut tpd

–< 80ps tr/tf

•Unique, patent-pending input isolation design

minimizes crosstalk

•Fail- Safe Inputprevents oscillations

•Ultra-low jitter design:

– <1psRMS random jitter

– <1psRMS cycle--tocycle jitter

– <10psPP total jitter (clock)

– <0.7psRMS MUX crosstalk induced jitter

•Unique patented input termination and VT pin accepts

DC--and ACcoupled inputs (CML, PECL, LVDS)

•400mV CML output swing

•2.5V ±5% or 3.3V ±10% supply voltage

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

•Available in 24-pin (4mm x 4mm) QFN package

Applications

•Redundant clock switchover

•Fail-safe clock protection

Markets

• LAN/WAN

•Enterprise servers

• ATE

•Test and measurement

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