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SY58021U

4GHz, 1:4 LVPECL Fanout Buffer/Translator with Internal Termination Precision Edge®

Micrel 

SY58021U

4GHz, 1:4 LVPECL Fanout

Buffer/Translator with Internal Termination

Precision Edge®

General Description

The SY58021U is a 2.5V/3.3V precision, high-speed, fully

differential 1:4 LVPECL fanout buffer. Optimized to provide

four identical output copies with less than 15ps output

skew and only 70 fsRMS phase jitter, the SY58021U can

process clock signals as fast as 4GHz.

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

termination architecture interfaces to differential LVPECL,

CML, and LVDS signals (AC- 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 )

REFAC

is provided to bias the VT pin. The outputs are 100k

LVPECL compatible, with extremely fast rise/fall times

guaranteed to 70fs.

The SY58021U 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 SY58022U 1:4 fanout buffer with 400mV LVPECL

output swing, or the SY58020U 1:4 CML fanout buffer. The

®

SY58021U 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.

Features

Precision Edge®

• Precision 1:4 LVPECL fanout buffer

• Low jitter performance:

− 70fsRMS phase jitter (typical)

• Accepts an input signal as low as 100mV

• Unique input termination and VT pin accepts DC-

coupled and AC-coupled differential inputs: LVPECL,

LVDS, and CML

• 100k LVPECL-compatible 800mV swing output

• Power supply 2.5V ±5% and 3.3V ±10%

• −40°C to +85°C temperature range

• Available in 16-pin (3mm × 3mm) QFN package

Applications

• All SONET and GigE clock distribution

• Fibre Channel clock and data distribution

• Backplane distribution

• High-end, low-skew, multiprocessor, synchronous clock

distribution

Block Diagram

Precision Edge is a registered trademark of Micrel, 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

September 2011

M9999-090111-B

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

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