Microchip SY89841U Bedienungsanleitung

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February 2005 M9999-021405

[email protected] or (408) 955-1690

SY89841U

Precision LVDS Runt Pulse

Eliminator 2:1 Multiplexer

Precision Edge

®

Features

•Selects between two sources, and provides a

glitch-free, stable LVDS output

•Guaranteed AC performance over temperature

and supply voltage:

–wide operating frequency: 1kHz to >1.5GHz

–<870ps In-to-Out t

pd

–<150ps t

r

/t

f

•Unique patent-pending input isolation design

minimizes crosstalk

•Fail-safe input prevents oscillations

•Ultra-low jitter design:

–<1ps

rms

random jitter

–<1ps

rms

cycle-to-cycle jitter

–<10ps

pp

total jitter (clock)

–<0.7ps

rms

MUX crosstalk induced jitter

•Unique patent-pending input termination and VT

pin accepts DC-coupled and AC-coupled inputs

(CML, PECL, LVDS)

•350mV LVDS output swing

•2.5V +5% power supply

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

•Available in 16-pin (3mm x 3mm) MLF™ package

Applications

•Redundant clock switchover

•Fail-safe clock protection

Markets

•LAN/WAN

•Enterprise servers

•ATE

•Test and measurement

General Description

The SY89841U is a low jitter LVDS, 2:1 input

multiplexer (MUX) optimized for redundant source

switchover applications. Unlike standard

multiplexers, the SY89841U unique 2:1 Runt Pulse

Eliminator (RPE) MUX prevents any short cycles or

“runt” pulses during switchover. In addition, a unique

Fail-safe Input protection prevents metastable

conditions when the selected input clock fails to a

DC voltage (voltage between the pins of the

differential input drops below 100mV).

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 (200mV

pp

) without any

level shifting or termination resistor networks in the

signal path. The outputs are 350mV, LVDS with fast

rise/fall times guaranteed to be less than 150ps.

The SY89841U operates from a 2.5V ±5% supply

and is guaranteed over the full industrial

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

SY89841U 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.

Precision Edge is a registered trademark of Micrel, Inc.

Micro

LeadFrame and MLF are trademarks of Amkor Technology, Inc.

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