DS1089LU-21G(2005) Просмотр технического описания (PDF) - Maxim Integrated
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DS1089LU-21G Datasheet PDF : 12 Pages
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Rev 1; 9/05
3.3V Center Spread-Spectrum EconOscillator™
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 I2C™-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
♦ I2C-Compatible Serial Interface
♦ Nonvolatile Settings
♦ Power-Down Mode
♦ Programmable Output Power-Down/Disable Mode
Ordering Information
PART
TEMP RANGE
DS1089LU-yxx*
-40°C to +85°C
*See Standard Frequency Options Table.
PIN-PACKAGE
8 µSOP (118 mil)
Pin Configuration and Typical Operating Circuits appear at end of data sheet.
PART
FREQUENCY (MHz)
DS1089LU-21G
14.7456
DS1089LU-4CL
18.432
DS1089LU-22F
24.576
DS1089LU-23C
33.3
DS1089LU-450
50.0
DS1089LU-866
66.6
DS1089LU-yxx
Fixed up to 66.6
Add “/T” for Tape and Reel.
Custom frequencies available, contact factory.
Standard Frequency Options
SPREAD (±%)
1
2
1
1
2
4
1, 2, 4, or 8
DITHER FREQUENCY
fMOSC / 4096
fMOSC / 4096
fMOSC / 2048
fMOSC / 4096
fMOSC / 4096
fMOSC / 4096
fMOSC / 2048 or 4096 or 8192
EconOscillator is a trademark of Dallas Semiconductor Corp.
I2C is a trademark of Philips Corp. Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed
Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided
that the system conforms to the I2C Standard Specification as defined by Philips.
______________________________________________ Maxim Integrated Products 1
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.
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