Microchip SY89218U Bedienungsanleitung

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SY89218U

Precision 1:15 LVDS Fanout Buffer with 2:1

MUX and Four ÷1/÷2/÷4 Clock Divider Output

Banks

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 2007

M9999-082407-

C

[email protected] or (408) 955-1690

General Description

The SY89218U is a

2.5V precision, high-speed,

integrated clock divider and LVDS fanout buffer capable

of handling clocks up to 1.5GHz. Optimized for

communications applications, the four independently

controlled output banks are phase-matched and can be

configured for pass through (÷1), ÷2 or ÷4 divider ratios.

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

input termination architecture that allows the user 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

low-skew, low-jitter outputs are LVDS compatible with

extremely fast rise/fall times guaranteed to be less than

200ps.

The /MR (master reset) input asynchronously resets the

outputs. A four-clock delay after de-asserting /MR allows

the counters to synchronize and start the outputs from

the same state without any runt pulse.

The SY89218U is part of Micrel’s Precision Edge

®

product family. All support documentation can be found

at Micrel's web site at: www.micrel.com

.

Features

•

Low-skew LV

DS output ba

nks with ind

epend

ently

programmable ÷1, ÷2 and ÷4 divider options

•Four output banks, 15 total outputs

•Guaranteed AC performance over temperature and

voltage:

–Accepts a clock frequency up to 1.5GHz

–<1600ps IN-to-OUT propagation delay

–<200ps rise/fall time

–

<35ps within bank skew

•Fail Safe Input

–Prevents outputs from oscillating

•Ultra-low jitter design:

–<1ps

RMS

random jitter

–<10ps

PP

total jitter (clock)

•Patent-pending input termination and VT pin accepts

DC-and AC-coupled inputs (CML, PECL, LVDS)

•LVDS-compatible outputs

•CMOS/TTL-compatible output enable (EN) and

divider select control

•2.5V ±5% power supply

•–40°C to +85°C temperature range

•Available in 64-pin TQFP

Applications

•All SONET/SDH applications

•All Fibre Channel applications

•All Gigabit Ethernet applications

Markets

•LAN/WAN routers/switches

•Storage

•ATE

•Test and measurement

Precision Edge is a registeredtrademark of Micrel, Inc.

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