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DS1089L
3.3V Center Spread`Spectrum EconOscillator
General DescriptionThe 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.
ApplicationsAutomotive Infotainment
Printers
Copiers
Computer Peripherals
POS Terminals
Cable Modems
FeaturesFactory-Programmed Square-Wave Generator
from 33.3MHz to 66.6MHzCenter Frequency Remains Constant Independent
of Dither PercentageNo External Timing Components RequiredEMI ReductionVariable Dither FrequencyUser Programmable Down to 130kHz with Divider
(Dependent on Master Oscillator Frequency)±1%, ±2%, ±4%, or ±8% Selectable Dithered
OutputGlitchless Output-Enable ControlI2C-Compatible Serial InterfaceNonvolatile SettingsPower-Down ModeProgrammable Output Power-Down/Disable Mode
DS1089L
3.3V Center Spread-Spectrum EconOscillator™Rev 1; 9/05
*See Standard Frequency Options Table.
Ordering Information
Pin Configuration and Typical Operating Circuits appear at end of data sheet.Custom frequencies available, contact factory.
EconOscillator is a trademark of Dallas Semiconductor Corp.
I2C is a trademark of Philips Corp. Purchase of I2C componentsfrom 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.
DS1089L
3.3V Center Spread-Spectrum EconOscillator™
ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage on VCCRelative to Ground.......................-0.5V to +6.0V
Voltage on SPRD, PDN, OE, SDA,
SCL Relative to Ground*........................-0.5V to (VCC+ 0.5V)
Operating Temperature Range...........................-40°C to +85°C
Programming Temperature Range.........................0°C to +70°C
Storage Temperature Range.............................-55°C to +125°C
Soldering Temperature...................See IPC/JEDEC J-STD-020A
*This voltage must not exceed 6.0V.
RECOMMENDED OPERATING CONDITIONS
DC ELECTRICAL CHARACTERISTICS
DS1089L
3.3V Center Spread-Spectrum EconOscillator™
MASTER OSCILLATOR CHARACTERISTICS
AC ELECTRICAL CHARACTERISTICS(VCC
DS1089L
3.3V Center Spread-Spectrum EconOscillator™
Note 1:All voltages are referenced to ground.
Note 2:This is the absolute accuracy of the master oscillator frequency at the default settings with spread disabled.
Note 3:This is the change that is observed in master oscillator frequency with changes in voltage at TA= +25°C.
Note 4:This is the change that is observed in master oscillator frequency with changes in temperature at VCC= 3.3V.
Note 5:The dither deviation of the master oscillator frequency is biderectional and results in an output frequency centered at the
undithered frequency.
Note 6:This indicates the time elapsed between power-up and the output becoming active. An on-chip delay is intentionally intro-
duced to allow the oscillator to stabilize. tSTABis equivalent to 512 master clock cycles and will depend on the pro-
grammed master oscillator frequency.
Note 7:Timing shown is for fast-mode (400kHz) operation. This device is also backward compatible with I2C standard-mode timing.
Note 8:CB—total capacitance of one bus line in picofarads.
Note 9:EEPROM write time applies to all the EEPROM memory and SRAM shadowed EEPROM memory when WC = 0.
The EEPROM write time begins after a stop condition occurs.
AC ELECTRICAL CHARACTERISTICS—I2C INTERFACE
NONVOLATILE MEMORY CHARACTERISTICS
DS1089L
3.3V Center Spread-Spectrum EconOscillator™
Typical Operating Characteristics(VCC= 3.3V, TA= +25°C, unless otherwise noted.)
DS1089L
3.3V Center Spread-Spectrum EconOscillator™ypical Operating Characteristics (continued)(VCC= 3.3V, TA= +25°C, unless otherwise noted.)
