1

Precision Edge®

SY58034U

Micrel, Inc.

M9999-020707

hbwhelp@micrel.com or (408) 955-1690

DESCRIPTION

■ Provides six ultra-low skew copies of the selected

input

■ 2:1 MUX input included for clock switchover

applications

■ Guaranteed AC performance over temperature and

voltage:

• Clock frequency range: DC to > 6GHz

• <20ps skew (output-to-output)

■ Unique input isolation design minimizes crosstalk

■ Ultra low-jitter design:

■ Low supply voltage operation: 2.5V and 3.3V

■ Unique input termination and VT pin accepts DC-

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

■ 400mV CML output swing

FEATURES

6GHz, 1:6 CML FANOUT BUFFER

WITH 2:1 MUX INPUT AND

INTERNAL I/O TERMINATION

SY58034U

APPLICATIONS

■ Redundant clock distribution

■ All SONET/SDH clock distribution

■ All Fibre Channel distribution

■ All Gigabit Ethernet clock distribution

The SY58034U is a 2.5V/3.3V precision, high-speed 1:6

fanout buffer capable of handling clocks up to 6GHz. A

differential 2:1 MUX input is included for redundant clock

switchover applications.

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

termination architecture that allows the device to interface

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

100mV without any level shifting or termination resistor

networks in the signal path. The outputs are 50Ω source

terminated CML, with extremely fast rise/fall times

guaranteed to be less than 60ps.

The SY58034U operates from a 2.5V ±5% supply or a

3.3V ±10% supply and is guaranteed over the full industrial

temperature range of –40°C to +85°C. For applications that

require LVPECL outputs, consider the SY58035U or

SY58036U Multiplexers. The SY58034U is part of Micrel’s

All support documentation can be found on Micrel’s web

site at www.micrel.com.

FUNCTIONAL BLOCK DIAGRAM

Precision Edge is a registered trademark of Micrel, Inc.

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

Q0

/Q0

Q1

/Q1

Q2

/Q2

Q3

/Q3

Q4

/Q4

Q5

/Q5

IN0

/IN0

50Ω

50Ω

IN1

/IN1

50Ω

50Ω

0

1

MUX

SEL

(TTL/CMOS)

S

2:1 MUX

1:6 Fanout

Rev.: D

Amendment: /0

Issue Date:

February 2007