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General Description

The DS1089L is a clock generator that produces a

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

quencies from 130kHz to 66.6MHz. The DS1089L is

shipped from the factory programmed at a specific fre-

quency. The DS1089L is pin-for-pin compatible with the

DS1087L, however, the DS1089L dithers at equal per-

centages above and below the center frequency. The

user still has access to the internal frequency divider,

selectable ±1%, ±2%, ±4%, or ±8% dithered output,

dithering rate, and programmable output power-

down/disable mode through an I

C-compatible pro-

gramming interface. All the device settings are stored

in nonvolatile (NV) EEPROM allowing it to operate in

stand-alone applications. The DS1089L also has

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

sensitive applications.

Applications

Automotive Infotainment

Printers

Copiers

Computer Peripherals

POS Terminals

Cable Modems

Features

♦ Factory-Programmed Square-Wave Generator

from 33.3MHz to 66.6MHz

♦ Center Frequency Remains Constant Independent

of Dither Percentage

♦ No External Timing Components Required

♦ EMI Reduction

♦ Variable Dither Frequency

♦ User Programmable Down to 130kHz with Divider

(Dependent on Master Oscillator Frequency)

♦ ±1%, ±2%, ±4%, or ±8% Selectable Dithered

Output

♦ Glitchless Output-Enable Control

♦ I

C-Compatible Serial Interface

♦ Nonvolatile Settings

♦ Power-Down Mode

♦ Programmable Output Power-Down/Disable Mode

DS1089L

3.3V Center Spread-Spectrum EconOscillator™

______________________________________________ Maxim Integrated Products 1

Rev 2; 5/06

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.

*See Standard Frequency Options Table.

Ordering Information

Pin Configuration and Typical Operating Circuits appear at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

DS1089LU-yxx* -40°C to +85°C

8 µSOP (118 mil)

Add “/T” for Tape and Reel.

Custom frequencies available, contact factory.

Standard Frequency Options

PART FREQUENCY (MHz) SPREAD (±%) DITHER FREQUENCY

DS1089LU-21G 14.7456 1 f

MOSC

/ 4096

DS1089LU-4CL 18.432 2 f

MOSC

/ 4096

DS1089LU-22F 24.576 1 f

MOSC

/ 2048

DS1089LU-23C 33.3 1 f

MOSC

/ 4096

DS1089LU-450 50.0 2 f

MOSC

/ 4096

DS1089LU-866 66.6 4 f

MOSC

/ 4096

DS1089LU-yxx Fixed up to 66.6 1, 2, 4, or 8 f

MOSC

/ 2048 or 4096 or 8192

EconOscillator is a trademark of Dallas Semiconductor Corp.

1 2 3 4 5 6 ... 11 12

Indice de contenidos

Pagina 1 - Standard Frequency Options

General DescriptionThe DS1089L is a clock generator that produces aspread spectrum (dithered) square-wave output of fre-quencies from 130kHz to 66.6MH

Pagina 2 - DC ELECTRICAL CHARACTERISTICS

DS1089LWRITE EE CommandThe WRITE EE command is useful in closed-loop appli-cations where the registers are frequently written. Inapplications where th

Pagina 3 - AC ELECTRICAL CHARACTERISTICS

DS1089L3.3V Center Spread-Spectrum EconOscillator™____________________________________________________________________ 11SDASCLtHD:STAtLOWtHIGHtRtFtBU

Pagina 4 - C INTERFACE

DS1089L3.3V Center Spread-Spectrum EconOscillator™Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied i

Pagina 5 - = 3.3V, T

DS1089L3.3V Center Spread-Spectrum EconOscillator™2 _____________________________________________________________________ABSOLUTE MAXIMUM RATINGSStres

Pagina 6 - Pin Description

DS1089L3.3V Center Spread-Spectrum EconOscillator™_____________________________________________________________________ 3PARAMETERSYMBOLCONDITIONMIN T

Pagina 7 - Detailed Description

DS1089L3.3V Center Spread-Spectrum EconOscillator™4 _____________________________________________________________________Note 1: All voltages are refe

Pagina 8 - Dither Percentage Settings

DS1089L3.3V Center Spread-Spectrum EconOscillator™_____________________________________________________________________ 50264810ACTIVE SUPPLY CURRENTv

Pagina 9 - Register Summary

Pin DescriptionPINNAMEFUNCTION1 OUT Oscillator Output2SPRDDither Enable. When the pin is high, the dither is enabled. When the pin is low, the dither

Pagina 10 - C Serial Port Operation

DS1089L3.3V Center Spread-Spectrum EconOscillator™_____________________________________________________________________ 7Block DiagramFACTORY-PROGRAMM

Pagina 11 - Applications Information

DS1089L3.3V Center Spread-Spectrum EconOscillator™8 _____________________________________________________________________Output ControlTwo user contro

Pagina 12 - Chip Topology

When dither is enabled (by selecting a dither frequencysetting greater than 0 with SPRD high), the masteroscillator frequency is dithered around the c

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