SY89465U

Precision LVDS 1:10 Fanout with 2:1 Runt

Pulse Eliminator MUX and Internal Termination

Precision Edge is a registered trademark of Micrel, Inc.

MLF and MicroLeadFrame are 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

December 2005

M9999-120105-A

General Description

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

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

optimized for redundant source switchover

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-

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 is guaranteed over the full industrial

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

Precision Edge

®

Features

• Selects between two sources, and provides 10

precision LVDS copies

• Guaranteed AC performance over temperature and

supply voltage:

– Wide operating frequency: 1kHz to >1.5GHz

• Unique, patent-pending input isolation design

minimizes adjacent channel crosstalk

• Fail-Safe Input prevents oscillations

• Ultra-low jitter design:

• Unique patented input termination and VT pin accepts

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

• 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™ package

Applications

• Redundant clock switchover

• Fail-safe clock protection

Markets

• LAN/WAN

• Enterprise servers

• ATE

• Test and measurement