sy89465u Micrel Semiconductor, sy89465u Datasheet

sy89465u

Manufacturer Part Number

sy89465u

Description

Sy89465u Precision Lvds 1 10 Fanout With 2 1 Runt Pulse Eliminator Mux And Internal Termination

Manufacturer

Micrel Semiconductor

Datasheet

1.SY89465U.pdf (19 pages)

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December 2007

General Description

The SY89465U is a low jitter, 1:10 LVDS fanout

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

optimized

applications. Unlike standard multiplexers, the

SY89465Us 2:1 Runt Pulse Eliminator (RPE) MUX

prevents any short cycles or “runt” pulses during

switchover. In addition, a unique Fail-Safe Input

(FSI) 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, 3-pin internal

termination architecture that allows customers to

interface to any differential signal (AC- or DC-

coupled) as small as 100mV (200mV

level shifting or termination resistor networks in the

signal path. The outputs are LVDS-compatible with

fast rise/fall times guaranteed to be less than 220ps.

The SY89465U operates from a 2.5V ±5% supply

and

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

SY89465U is part of Micrel’s high-speed, Precision

Edge

All support documentation can be found on Micrel’s

web site at: www.micrel.com.

Precision Edge is a registered trademark of Micrel, Inc.

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

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

product line.

guaranteed

for

redundant

over

source

the

full

) without any

switchover

industrial

Pulse Eliminator MUX and Internal Termination

Features

• Selects between two sources, and provides 10

• Guaranteed AC performance over temperature and

• Unique, patent-pending input isolation design

• Fail-Safe Input prevents oscillations

• Ultra-low jitter design:

• Unique patented input termination and VT pin accepts

• 325mV LVDS output swing

• 2.5V ±5% supply voltage

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

• Output enable

• Available in 44-pin (7mm x 7mm) MLF

Applications

• Redundant clock switchover

• Fail-safe clock protection

Markets

• LAN/WAN

• Enterprise servers

• ATE

• Test and measurement

Precision LVDS 1:10 Fanout with 2:1 Runt

precision LVDS copies

supply voltage:

– Wide operating frequency: 1kHz to >1.5GHz

– < 1200ps In-to-Out t

– < 220ps t

minimizes adjacent channel crosstalk

– <1ps

– <10ps

– <0.7ps

DC- and AC-coupled inputs (CML, PECL, LVDS)

RMS

total jitter (clock)

random jitter

cycle-to-cycle jitter

MUX crosstalk induced jitter

SY89465U

hbwhelp@micrel.com

or (408) 955-1690

Precision Edge

M9999-120607-B

package

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