1

Precision Edge™

SY58012U

Micrel

DESCRIPTION

Precision 1:2, 800mV LVPECL fanout buffer

Guaranteed AC performance over temperature/

voltage:

• < 15ps max skew

Low jitter performance

Accepts an input signal as low as 100mV

coupled and AC-coupled differential inputs:

LVPECL, LVDS, and CML

Outputs are 100k LVPECL compatible, 800mV swing

Power supply 2.5V

–40

Available in 16-pin (3mm

××××× 3mm) MLF™ package

FEATURES

5GHz, 1:2 LVPECL FANOUT

BUFFER/TRANSLATOR

WITH INTERNAL INPUT TERMINATION

Precision Edge™

SY58012U

APPLICATIONS

s All SONET and GigE clock distribution

s Fibre Channel clock and data distribution

s Backplane distribution

s High-end, low skew, multiprocessor synchronous

clock distribution

Rev.: A

Amendment: /0

Issue Date:

July 2003

The SY58012U is a 2.5V/3.3V precision, high-speed, fully

differential 1:2 LVPECL fanout buffer. Optimized to provide

two identical output copies with less than 15ps of skew and

less than 10ps

clock signals as fast as 5GHz or 5Gbps data.

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

termination architecture that interfaces to LVPECL, LVDS

or CML differential signals, (AC-coupled or DC-coupled) as

small as 100mV without any level-shifting or termination

resistor networks in the signal path. For AC-coupled input

interface applications, an on-board output reference voltage

(V

100k LVPECL compatible, with extremely fast rise/fall times

guaranteed to be less than 110ps.

The SY58012U operates from a 2.5V

±5% supply or

3.3V

±10% supply and is guaranteed over the full industrial

temperature range (–40

°C to +85°C). For applications that

require faster rise/fall times, or greater bandwidth, consider

the SY58013U 1:2 fanout buffer with 400mV output swing,

or the SY58011 1:2 CML (400mV) fanout buffer. The

SY58012U is part of Micrel’s high-speed, Precision Edge™

product line. Data sheets and support documentation can

be found on Micrel’s web site at www.micrel.com.

FUNCTIONAL BLOCK DIAGRAM

TYPICAL PERFORMANCE

Precision Edge is a trademark of Micrel , Inc.

IN

/IN

Q1

/Q1

Q0

/Q0

50

Ω

50

Ω

2.5GHz Output

TIME (50ps/div.)

2GHz with 100mV Input

Precision Edge™