Microchip SY89467U Handleiding

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SY89467U

Precision LVPECL 1:20 Fanout with 2:1 MUX

and Internal Termination with Fail-Safe Input

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

April 2008M9999-040808-C

[email protected] or (408) 955-1690

General Description

The SY89467U is a 2.5/3.3V, 1:20 LVPECL fanout

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

A unique Fail-Safe Input (FSI) protection prevents

metastable output conditions when the selected

input clock fails to a DC voltage (when voltage

between the pins of the dierential input drops

signicantly below 100mV).

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

internal termination architecture that can interface 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

outputs are 800mV, LVPECL with fast rise/fall times

guaranteed to be less than 270ps.

The SY89467U operates from a 2.5V ±5% or 3.3V

±10% supply and is guaranteed over the full

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

SY89467U 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.

Functional Block Diagram

Precision Edge®

Features

•Selects between two inputs, and provides 20

precision LVPECL copies

•Fail-Safe Input

– Prevents outputs from oscillating when input is

invalid

•Guaranteed AC performance over temperature and

supply voltage:

– DC-to >1.5 GHz throughput

– < 1200ps Propagation Delay (In-to-Q)

– 270ps Rise/Fall times

•Ultra-low jitter design:

– <1psRMS random jitter

– <1psRMS cycle-to-cycle jitter

– <10psPP total jitter (clock)

– <0.7psRMS MUX crosstalk induced jitter

•Unique, patented MUX input isolation design

minimizes adjacent channel crosstalk

•Unique patented internal termination and VT pin

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

LVDS)

•Wide input voltage range: VCC to GND

•2.5V ±5% or 3.3V ±10% supply voltage

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

•Available in 64-pin TQFP package

Applications

•Fail-safe clock protection

•SONET clock distribution

•Backplane distribution

Markets

•LAN/WAN

•Enterprise servers

•ATE

•Test and measurement

Precision Edge is a registered trademark of Micrel, Inc.

MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.

Product specificaties