SY898535L

Precision Differential 3.3V, Low Skew, 1:4

LVCMOS/LVTTL -to-LVPECL Fanout Buffer

Precision Edge is a registered trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

General Description

The SY898535L is a 3.3V, low skew, 1:4 LVCMOS/LVTTL-

to-LVPECL fanout buffer with two selectable single ended

clock inputs. The CLK0 and CLK1 accept LVCMOS or

LVTTL input levels and translate them to 3.3V LVPECL

levels. To eliminate runt pulses on the outputs during

asynchronous assertion/de-assertion of the clock enable

pin, the clock enable is synchronized with the input signal.

The SY898535L operates from a 3.3V ±5% supply and is

guaranteed over the full industrial temperature range of

–40°C to +85°C. The SY898535L is part of Micrel’s high-

speed, Precision Edge

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Functional Block Diagram

Features

• Provides four differential 3.3V LVPECL copies

• Selects between single-ended CLK0 or CLK1 input

• CLK0 and CLK1 accept LVCMOS or LVTTL input levels

• Guaranteed AC performance over temperature and

supply voltage:

235MHz Maximum output frequency

<1.9ns Propagation delay (In-to-Q)

<30ps Output skew

<250ps Part-to-part skew

Additive phase jitter, RMS: 0.09ps (typical)

• 3.3V ±5% supply voltage

• –40°C to +85°C industrial temperature operating range

• Available in a 20-pin TSSOP package

Applications

• Gigabit Ethernet

• 10Gigabit Ethernet

• SONET/SDH

• PCI

Markets

• LAN/WAN

• Enterprise servers

• ATE

• Test and measurement

June 2011

M9999-062211-B