Microchip SY89855U Handleiding

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SY89855U

Precision Low Power Differential LVPECL 4:1

MUX with 1:2 Fanout and Internal

Termination

Micrel Inc. • 2180 Fortu

ne Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-08

00 • fax + 1 (408) 474-1000 • http://www.micrel.com

August 2007

M9999-082907-C

[email protected]

or (408) 955-1690

General Description

The SY8985

5U is a 2.5V/3.3V precision, high-speed,

4:1 differential multiplexer with 100K LVPECL (800mV)

compatible outputs, capable of handling clocks up to

2.5GHz and data streams up to 2.5Gbps. In addition, a

1:2 fanout buffer provides two copies of the selected

inputs.

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

input termination architecture that allows customers to

interface to any differential signal (AC- or DC-coupled)

as small as 100mV without any level shifting or

termination resistor networks in the signal path. The

result is a clean, stub-free, low-jitter interface solution.

The outputs are 800mV LVPECL, (100K temperature

compensated) with fast rise/fall times guaranteed to be

less than 180ps.

The SY89855U operates from a 2.5V ±5% supply or a

3.3V ±10% supply and is guaranteed over the full

industrial temperature range of –40°C to +85°C. For

applications that require higher performance, consider

the SY58029U. The SY89855U 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

.

Typical Performance

Precision Edge

®

Features

•Select 1 of 4 differential inputs

•Provide

s two copies of the selected input

•Low power 260mW (V

CC

= 2.5V)

•Guaranteed AC performance over temperature and

voltage:

–DC-to->2.5Gbps data rate throughput

–

<410ps In-to-Q t

pd

–<180p

s t

r

/ t

f

times

•Ultra low-jitter design:

–

<10

p

s

PP

total jitter (clock)

–<1ps

RMS

random jitter

–<10ps

PP

deterministic jitter

–<0.7ps

RMS

crosstalk-induced jitter

•Unique, patent-pending input design minimizes

crosstalk

•Accepts an input signal as low as 100mV

•Unique patented input termination and VT pin

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

LVDS)

•800mV 100K LVPECL output swing

•Power supply 2.5V ±5% or 3.3V ±10%

•–40°C to +85°C temperature range

•

Available in 32-pin (5mm x 5mm) QFN packag

e

Applications

•Redundant clock and/or data distribution

•All SONET/OC-3 to OC-48 clock/data distribution

•Loopback

•All Fibre Channel applications

•All GigE applications

Markets

•LAN/WAN communication

•Enterprise servers

•ATE

•Test and measurement

Precision Edge is a registeredtrademark of Micrel, Inc.

Product specificaties