1

SY58029U

Micrel, Inc.

M9999-020207

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

DESCRIPTION

s Selects 1 of 4 differential inputs

s Provides two copies of the selected input

s Guaranteed AC performance over temperature and

voltage:

• DC-to-> 5Gbps data rate throughput

s Ultra low-jitter design:

s Unique patended input design minimizes crosstalk

s Accepts an input signal as low as 100mV

s Unique patented input termination and V

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

LVDS)

s 800mV 100K LVPECL output swing

s Power supply 2.5V

s –40

s Available in 32-pin (5mm

FEATURES

ULTRA PRECISION DIFFERENTIAL

LVPECL 4:1 MUX with 1:2 FANOUT

and INTERNAL TERMINATION

SY58029U

APPLICATIONS

s Redundant clock and/or distribution

s All SONET/SDH clock/data distribution

s Loopback

s All Fibre Channel distribution

s All Gigabit Ethernet clock and/or data distribution

Rev.: C

Amendment: /0

Issue Date:

February 2007

The SY58029U is a 2.5V/3.3V precision, high-speed, 4:1

differential multiplexer with 100k LVPECL (800mV)

compatible outputs, capable of handling clocks up to 4GHz

and data streams up to 5Gbps. In addition, a 1:2 fanout

buffer provides two copies of the selected inputs.

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 without any level shifting or termination resistor

networks in the signal path. The result is a clean, stub-free,

low-jitter interface solution. The outputs are 800mV LVPECL,

(100k temperature compensated) with extremely fast rise/

fall times guaranteed to be less than 110ps.

The SY58029U 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 CML outputs, consider the SY58028U. For 400mV

LVPECL outputs, consider the SY58030U. The SY58029U

All support documentation can be found on Micrel’s web

site at www.micrel.com.

TYPICAL PERFORMANCE

Precision Edge is a registered trademark of Micrel, Inc.

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

FUNCTIONAL BLOCK DIAGRAM

IN0

/IN0

50

Ω

50

Ω

IN1

/IN1

50

Ω

50

Ω

Q0

/Q0

0

1

MUX

4:1

MUX

1:2

Fanout

IN2

/IN2

50

Ω

50

Ω

2

IN3

/IN3

50

Ω

50

Ω

3

SEL0 (CMOS/TTL)

SEL1 (CMOS/TTL)

Q1

/Q1

TIME (100ps/div.)