General Description

The DS1087L is a clock generator that produces a

spread-spectrum (dithered) square-wave output of fre-

quencies from 130kHz to 66.6MHz. The DS1087L is

shipped from the factory programmed at a specific fre-

quency and spread-spectrum percentage. The user still

has access to an internal frequency divider, selectable

2% or 4% dithered output, and programmable output

power-down/disable mode through a 2-wire program-

ming interface. All the device settings are stored in non-

volatile (NV) EEPROM allowing it to operate in

stand-alone applications. The DS1087L has power-

down and output-enable control pins for power-sensi-

tive applications.

Applications

Printers

Copiers

PCs

Computer Peripherals

Cell Phones

Cable Modems

Features

♦ Factory Programmed Square-Wave Generator

from 130kHz to 66.6MHz

♦ No External Timing Components Required

♦ EMI Reduction

♦ 2.7V to 3.6V Supply

♦ User Programmable Down to 130kHz with Divider

(Dependent on Master Oscillator Frequency)

♦ 2% or 4% Selectable Dithered Output

♦ Glitchless Output-Enable Control

♦ 2-Wire Serial Interface

♦ Nonvolatile Settings

♦ Power-Down Mode

♦ Programmable Output Power-Down/Disable Mode

3.3V Spread-Spectrum EconOscillator

______________________________________________ Maxim Integrated Products

1

PDN

OE

GND

1

2

8

7

SCL

SDA

SPRD

OUT

µSOP (118 mils)

TOP VIEW

3

4

6

5

DS1087L

Pin Configuration

Ordering Information

Rev 1; 11/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-PACKAGE

DS1087LU-yxx

-40°C to +85°C

8 µSOP (118 mils)

EconOscillator is a trademark of Dallas Semiconductor.

Typical Operating Circuits appear at end of data sheet.

Standard Frequency Options

PART

FREQUENCY (MHz)

SPREAD (%)

DS1087LU-202

2.0480

2

DS1087LU-402

2.0480

4

DS1087LU-210

10.0

2

DS1087LU-216

16.6

2

DS1087LU-266

66.6

2

DS1087LU-466

66.6

4

DS1087LU-yxx

Fixed up to 66.6

2 or 4

Custom frequencies and over 20 standard frequencies avail-

able, contact factory.