SY89231U

3.2GHz Precision, LVDS ÷3, ÷5 Clock Divider

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

November 2007

M9999-110507-A

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

General Description

The SY89231U is a precision, low jitter 3.2GHz

÷3,

÷5 clock divider with a LVDS output. The differential

input

includes

Micrel’s

unique,

3-pin

internal

termination architecture that allows the input to

interface to any differential signal (AC- or DC-

level shifting or termination resistor networks in the

signal

path.

The

outputs

are

325mV,

100K-

compatible LVDS with fast rise/fall times guaranteed

to be less than 200ps.

The SY89231U operates from a 2.5V ±5% supply

and

is

guaranteed

over

the

full

industrial

temperature

range

of

–40°C

to

+85°C.

The

SY89231U is part of Micrel’s high-speed, Precision

Edge

All support documentation can be found on Micrel’s

web site at: www.micrel.com.

Block Diagram

Precision Edge

®

Features

• Accepts a high-speed input and provides a precision

÷3 and ÷5 sub-rate, LVDS output

• Guaranteed AC performance over temperature and

supply voltage:

–

DC-to >3.2GHz throughput

– <810ps Propagation Delay (In-to-Q)

– <200ps Rise/Fall times

• Ultra-low jitter design:

• Unique patented internal termination and VT pin

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

LVDS)

• Wide input voltage range V

• 325mV LVDS output

• 45% to 55% Duty Cycle (÷ 3)

• 47% to 53% Duty Cycle (÷ 5)

• 2.5V ±5% supply voltage

• -40°C to +85°C industrial temperature range

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

Applications

• Fail-safe clock protection

Markets

• LAN/WAN

• Enterprise servers

• ATE

• Test and measurement