Microchip SY89465U Bedienungsanleitung

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SY89465U

Precision LVDS 1:10 Fanout with 2:1 Runt

Pulse Eliminator MUX and Internal Termination

Micrel Inc. • 218

0 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • ht

tp://www.micrel.com

August 2010

M9999-080510-C

[email protected]

or (408) 955-1690

General Description

The SY8946

5U is a low-jitter, 1:10 LVDS fanout

buffer with a 2:1 differential input multiplexer (MUX)

optimized for redundant source switchover

applications. Unlike standard multiplexers, the

SY89465Us 2:1 Runt Pulse Eliminator (RPE) MUX

prevents any short cycles or “runt” pulses during

switchover. In addition, a unique Fail-Safe Input

(FSI) 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, 3-pin internal

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 outputs are LVDS-compatible with

fast rise/fall times guaranteed to be less than 220ps.

The SY89465U operates from a 2.5V ±5% supply

and is guaranteed over the full industrial

temperature range of –40°C to +85°C. The

SY89465U 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 10

precision LVDS copies

•Guaranteed AC performance over temperature and

supply voltage:

–Wide operating frequency: 1kHz to >1.5GHz

–<1200ps In-to-Out t

pd

–<2

20ps t

r

/t

f

•Uniq

ue, patent-pending input isolation design

minimizes adjacent channel crosstalk

•Fail-Safe Input prevents oscillations

•Ultra-low jitter design:

–

183 fs

RMS

phase jitter (typical)

–<0.7ps

RMS

MUX crosstalk-induced jitter

•Unique patented input termination and VT pin accepts

DC-

and AC-cou

pled inputs (CML, PECL, LVDS)

•325mV LVDS output swing

•2.5V ±5% supply voltage

•−40

°C to +85°C industrial temperatur

e range

•Output enable

•Available in 44-pin (7mm x 7mm) QFN package

Applications

•Redundant clock switchover

•Fail-safe clock protection

Markets

•LAN/WAN

•Enterprise servers

•ATE

•Test and measurement

Precision Edge is a registeredtrademark of Micrel, Inc.

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