Microchip SY89221U Bedienungsanleitung

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Micrel Inc. • 2180 Fortu

ne 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

SY89221U

Precision 1:15 LVPECL Fanout Buffer with

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

Output Banks

General Description

The SY89221

U is a 2.5/3.3V precision, high-speed,

integrated clock divider and LVPECL 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 LVPECL

compatible with extremely fast rise/fall times that are

guaranteed to be less than 220ps.

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 SY89221U 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

•

Four low-skew LVPECL output banks

with

independ

entl

y

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

–<270ps rise/fall time

–<35 ps within-bank skew

•Fail Safe Input

–Prevents outputs from oscillating

•Ultra-low jitter design:

– <1p

s

RMS

random jitter

– <10ps

PP

total jitter (clock)

•Patent-pending input termination and VT pin

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

LVDS)

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

divider sele

ct cont

rol

•2.5V ±5% or 3.3V ±10% 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

•Enterprise servers

•Storage

•ATE

•Test and measurement

Precision Edge is a registeredtrademark of Micrel, Inc.

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