Microchip SY89474U Bedienungsanleitung

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SY89474U

Precision LVDS 2:1 Multiplexer with 1:2

Fanout and Internal Termination

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

August 2005M9999-081105

[email protected] or (408) 955-1690

General Description

The SY89474U is a 2.5V precision, high-speed 2:1

differential MUX capable of processing clocks up to

2.5GHz and data up to 2.5Gbps.

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

termination architecture that directly interfaces to any

differential signal (AC- or DC-coupled) as small as

100mV (200mVPP) without any level shifting or

termination resistor networks in the signal path. The

output is 325mV LVDS with fast rise/fall times guaranteed

to be less than 150ps.

The SY89474U operates from a 2.5V ±5% supply and is

guaranteed over the full industrial temperature range of

-40°C to +85°C. The SY89474U is part of Micrel’s high-

speed, Precision Edge® product line. For multiple clock

switchover solutions, please refer to the SY89840U–

SY89845U family.

All support documentation can be found on Micrel’s web

site at: www.micrel.com.

Functional Block Diagram

Precision Edge®

Features

•Selects between two input channels and provides two

copies of the selected input

•Guaranteed AC performance over temperature and

supply voltage:

−DC to 2.5Gbps data throughput

−DC to 2.5GHz fMAX (clock)

−<470ps In-to-Out tpd

−<150ps tr/tf

−<20ps output-to-output skew

•Unique, patent-pending input isolation design

minimizes crosstalk

•Ultra-low jitter design:

−<1psRMS random jitter

−<10psPP deterministic jitter

−<1psRMS cycle-to-cycle jitter

−<10psPP total jitter (clock)

−<0.7psRMS crosstalk induced jitter

•Unique patent-pending input termination and VT pin

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

LVDS)

•325mV LVDS output swing

•2.5V ±5% supply voltage

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

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

Applications

•Clock switchover

•Data distribution

Markets

•LAN/WAN

•Enterprise Servers

•ATE

•Test and Measurement

Precision Edge is a registered trademark of Micrel, Inc.

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