Microchip SY89846U Bedienungsanleitung

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SY89846U

1.5GHz Precision, LVPECL 1:5 Fanout with 2:1

MUX and Fail Safe Input with Internal

Termination

Precision Edge

®

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

Oct. 1, 2013

M9999-072211B

[email protected] or (408) 955-1690

General Description

The SY89846U is a 2.5/3.3V, 1:5 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 (voltage between

the pins of the differential input drops significantly

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 (200mV

PP

) 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 250ps.

The SY89846U 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

SY89846U 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 5 precision

LVPECL copies

Fail-Safe Input

–Prevents outputs from oscillating when input is

invalid

Guaranteed AC performance over temperature and

supply voltage:

–DC-to >1.5GHz throughput

–< 900ps Propagation Delay (IN-to-Q)

–< 250ps Rise/Fall times

Ultra-low jitter design:

–150fs RMS phase jitter (Typ)

–0.7ps

RMS

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 3.3 ±10% supply voltage

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

Available in 32-pin (5mm x 5mm) QFN 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.

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