SY89473U

Precision LVPECL 2:1 Multiplexer with 1:2

Fanout and Internal Termination

Precision Edge is a registered trademark of Micrel, Inc.

MLF and MicroLeadFrame are registered trademarks of Amkor Technology.

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

May 2007

M9999-052207-B

General Description

The SY89473U is a 2.5V/3.3V precision, high-speed 2:1

differential MUX capable of processing clocks up to

2.5GHz and data up to 2.5Gbps.

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

input termination architecture that directly interfaces to

any differential signal (AC- or DC-coupled) as small as

termination resistor networks in the signal path. The

output is 800mV, 100K-compatible, LVPECL with fast

rise/fall times guaranteed to be less than 190ps.

The SY89473U 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 SY89473U is

part of Micrel’s high-speed, Precision Edge

line. For multiple-clock switchover solutions, please refer

to the SY89840–SY89843U family.

All support documentation can be found on Micrel’s web

Functional Block Diagram

Precision Edge

®

Features

• Selects between two input channels and provides two

copies of the selected output

• Guaranteed AC performance over temperature and

supply voltage:

- DC to 2.5Gbps data throughput

- <20ps Output-to-output skew

• Unique patented input isolation design minimizes

crosstalk

• Ultra-low Jitter Design:

• Unique patent-pending input termination and VT pin

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

LVDS)

• 800mV (100K) LVPECL output swing

• 2.5V ±5% or 3.3V ±10% supply voltage

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

Applications

• Clock switchover

• Data distribution

Markets

• LAN/WAN

• Enterprise servers

• ATE

• Test and measurement