DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
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General Description
The DS1091L is a low-cost clock generator that is factory
trimmed to output frequencies from 130kHz to 66.6MHz
with a nominal accuracy of ±0.25%. The device can also
produce a center- or down-dithered spread-spectrum
output with pin-selectable dither magnitude and rate.
Assembled in an 8-pin µMAX® package, the DS1091L
is designed to operate with a 3.0V to 3.6V power supply
over the automotive temperature range (-40°C to +125°C).
Applications
Automotive Infotainment
POS Terminals
LCD Displays
Printers
Industrial Control
Features
S Spread-Spectrum Clock Output from 130kHz to
66.6MHz
S -40°C to +125°C Operating Temperature Range
S ±1.75% Accuracy Across Temperature and Voltage
S Factory Trimmed
S Center-Dithered (DS1091LUA) or Down-Dithered
(DS1091LUB) Spread-Spectrum Output
S Pin-Selectable Center-Dither Magnitude of 0%,
±1%, ±2%, or ±4%
S Pin-Selectable Down-Dither Magnitude of 0%, -2%,
-4%, or -8%
S Pin-Selectable Dither Rate
S 3.0V to 3.6V Supply Operation
S Lead(Pb)-Free, 8-Pin µMAX Package
Custom Frequency Options
Custom frequency options are available. See the
Ordering Information or contact the factory by email at
custom.oscillators@maxim-ic.com for more information.
19-5768; Rev 2; 9/11
Ordering Information appears at end of data sheet.
EconOscillator is a trademark and µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/DS1091L.related
8
3
4
2
1
OUT DR
VCC
VCC
fOUT
DECOUPLING
CAPACITORS
7
6
5SEL0
VCC
N.C.
N.C.
SEL1
GND
VCC
DS1091L
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Voltage Range on VCC Relative to Ground .........-0.5V to +6.0V
Voltage Range on DR, SEL0, SEL1
Relativeto Ground ................................ -0.5V to (VCC + 0.5V)*
Continuous Power Dissipation (TA = +70°C)
µMAX (derate 4.5mW/°C above +70°C) .....................362mW
Operating Temperature Range ........................ -40°C to +125°C
Storage Temperature Range ............................ -55°C to +125°C
Lead Temperature (soldering, 10s) ................................+300°C
Soldering Temperature (reflow) ......................................+260°C
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
RECOMMENDED OPERATING CONDITIONS
(TA = -40NC to +125NC, unless otherwise noted.)
DC ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, TA = -40NC to +125NC, unless otherwise noted.)
*This voltage must not exceed 6.0V.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage VCC (Note 1) 3.0 3.3 3.6 V
High-Level Input Voltage
(SEL0, SEL1, DR) VIH 0.7 x
VCC
VCC +
0.3 V
Low-Level Input Voltage
(SEL0, SEL1, DR) VIL -0.3 0.3 x
VCC V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
High-Level Output Voltage (OUT) VOH IOH = -4mA, VCC = 3.0V 2.4 V
Low-Level Output Voltage (OUT) VOL IOL = 4mA 0.4 V
High-Level Input Current
(SEL0, SEL1, DR) IIH VCC = 3.6V 1 FA
Low-Level Input Current
(SEL0, SEL1, DR) IIL VIL = 0V -1 FA
Supply Current (Active) ICC (Note 2) 16 mA
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Note 1: All voltages are referenced to ground. Currents entering the IC are specified positive and currents exiting the IC are negative.
Note 2: Supply current measured with CL = 15pF, VCC = 3.6V, TA = +25°C, fOUT = 66.6MHz, no dither.
Note 3: No dither.
Note 4: Guaranteed by design.
Note 5: For aging characteristics, contact factory.
AC ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, TA = -40NC to +125NC, unless otherwise noted.)
Typical Operating Characteristics
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Frequency Range fOUT (Note 3) 0.130 66.6 MHz
Output Center Frequency
Tolerance DfOUT
VCC = 3.3V, TA = +25NC-0.25 0 +0.25
%
Across TA and VCC -1.75 +1.75
0NC to +70NC, across VCC -1.2 +1.2
Power-Up Time tPU (Note 4) 0.1 ms
Load Capacitance CL15 50 pF
Duty Cycle < 33.3MHz (Note 3) 50 %
R 33.3MHz (Note 3) 40 60
Jitter (RMS), 50MHz 0.3 %
7.4
7.8
7.6
8.4
8.2
8.0
9.0
8.8
8.6
9.2
-40 20-10 50 80 110
SUPPLY CURRENT vs. TEMPERATURE
DS1091L toc01
TEMPERATURE (°C)
ICC (mA)
VCC = 3.6V
VCC = 3.3V
VCC = 3.0V
-1.75
-0.75
-1.25
0.25
-0.25
1.25
0.75
1.75
-40 20 50-10 80 110
FREQUENCY VARIATION
vs. TEMPERATURE
DS1091L toc02
TEMPERATURE (°C)
FREQUENCY VARIATION (%)
VCC = 3.3V
NO DITHER
fOUT = 130kHz
fOUT = 66MHz
-0.25
-0.10
-0.15
-0.20
-0.05
0.00
0.05
0.10
0.15
0.20
0.25
3.0 3.23.1 3.3 3.4 3.5 3.6
FREQUENCY VARIATION
vs. VOLTAGE
DS1091L toc03
VCC (V)
FREQUENCY VARIATION (%)
fOUT = 66MHz
fOUT = 130kHz
NO DITHER
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
48.0
48.5
49.0
49.5
50.0
50.5
51.0
51.5
52.0
3.0 3.23.1 3.3 3.4 3.5 3.6
DUTY CYCLE vs. SUPPLY VOLTAGE
DS1091L toc04
VCC (V)
DUTY CYCLE (%)
fOUT = 66MHz
fOUT = 130kHz
NO DITHER
40
46
44
42
50
48
58
56
54
52
60
-40 -15 10 35 60 85 110
DUTY CYCLE vs. TEMPERATURE
DS1091L toc05
TEMPERATURE (°C)
DUTY CYCLE (%)
fOUT = 66MHz
fOUT = 130kHz
NO DITHER
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT RISE TIME
DS1091L toc06
TIME (ns)
OUTPUT (V)
RISE TIME
= 1.02ns
TYPICAL
AT 12pF LOAD
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT FALL TIME
DS1091L toc07
TIME (ns)
OUTPUT (V)
FALL TIME
= 1.13ns
TYPICAL
AT 12pF LOAD
-35
-30
-25
-20
-15
-10
-5
0
5
31.9 32.932.4 33.4 33.9 34.4 34.9
SPECTRUM ATTENUATION vs. FREQUENCY
AT DIFFERENT DITHER AMPLITUDES
DS1091L toc08
FREQUENCY (MHz)
ATTENUATION (dB)
0%
±1%
±2%
±4%
8dB 11dB 14dB
fOUT = 33.3MHz
RBW = 120kHz
CENTER DITHER
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Pin Configuration Pin Description
Block Diagram
PIN NAME FUNCTION
1 OUT Spread-Spectrum Clock Output
2 VCC Supply Voltage
3 GND Ground
4 SEL1 Spread-Spectrum Dither Magnitude
Select Inputs. Selects dither
magnitude (see Table 1).
5 SEL0
6, 7 N.C. No Connection
8 DR Spread-Spectrum Dither Rate Selector.
Selects dither rate (see Table 2).
1
2
3
4
8
7
6
5
DR
N.C.
+
N.C.
SEL0SEL1
GND
VCC
OUT
µMAX
TOP VIEW
DS1091L
FACTORY-PROGRAMMED
MASTER OSCILLATOR
DITHER RATE DIVIDER TRIANGLE-WAVE GENERATOR
(DITHER %)
FACTORY-PROGRAMMED
PRESCALER
SEL0SEL1DR
OUT
fOUT
VCC
VCC
GND
fMOSC IS THE MASTER OSCILLATOR FREQUENCY.
fMOSC
fDITHER
fMOSC
DS1091L
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Detailed Description
The DS1091L clock generator is capable of output fre-
quencies from 130kHz to 66.6MHz over the full automo-
tive temperature range (-40°C to +125°C). The device
can also produce a spread-spectrum (dithered) square-
wave output using four pin-selectable dither percent-
ages. Both center (DS1091LUA) and down (DS1091LUB)
dithering options are available. The device also features
two selectable dither rates.
The DS1091L is shipped from the factory programmed to
a customer-specified frequency.
Spread Spectrum
The DS1091L can reduce radiated emission peaks. The
dither percentage is controlled by the state of the SEL0
and SEL1 pins. The output frequency can be dithered
at 0%, ±1%, ±2%, and ±4%, centered around the pro-
grammed frequency (for the DS1091LUB this can be
down dithered by 0%, -2%, -4%, and -8%).
The two select pins SEL0 and SEL1 provide a means of
selecting the dither magnitudes as follows:
A triangle-wave generator injects a control signal into the
master oscillator to dither its output. The dither rate is a
function of the output frequency, fOUT, as well as the set-
ting of the DR pin (see the equation below). Figure 1A and
Figure 1B show a plot of the output frequency vs. time.
OUT
n
f
DITHER RATE
2
=
where n is defined in Table 2 as a function of output
frequency. For example, for an output frequency of
27.0MHz, the dither rate would be 13.2kHz for DR = 1
and 6.6kHz for DR = 0.
Power-Up
Upon the application of power, the DS1091L output is
held in the low state until tPU has elapsed. This removes
any possibility of erroneous output transitions during ini-
tial power-up.
DS1091L Frequency Spreading Profile as a Function of Dither %
Figure 1A. Center Dithered Figure 1B. Down Dithered
Table 1. Dither Magnitude
Table 2. Value of n w.r.t. Output Frequency
SEL1
LOGIC
LEVEL
SEL0
LOGIC
LEVEL
DITHER MAGNITUDE (%)
DS1091LUA DS1091LUB
0 0 No dither No dither
0 1 Q1-2
1 0 Q2-4
1 1 Q4-8
OUTPUT FREQUENCY fOUT
(MHz) n
fOUT (min) fOUT (max) DR = LOGIC
LEVEL 1
DR = LOGIC
LEVEL 0
0.130 0.260 4 5
0.261 0.521 5 6
0.522 1.042 6 7
1.043 2.083 7 8
2.084 4.167 8 9
4.168 8.333 9 10
8.334 16.667 10 11
16.668 33.333 11 12
33.334 66.667 12 13
TIME
1
DITHER FREQ
PROGRAMMED fOUT+
(1%, 2%, OR 4% OF fOUT)
PROGRAMMED fOUT-
(1%, 2%, OR 4% OF fOUT)
PROGRAMMED fOUT
DITHER
AMOUNT
(±1%, ±2%,
OR ±4%)
IF DITHER AMOUNT = 0%
fOUT
TIME
1
DITHER FREQ
PROGRAMMED fOUT
PROGRAMMED fOUT-
(2%, 4%, OR 8% OF fOUT)
DITHER
AMOUNT
(-2%, -4%,
OR -8%)
IF DITHER AMOUNT = 0%
fOUT
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Applications Information
Power-Supply Decoupling
To achieve best results, it is highly recommended that
decoupling capacitors are used on the IC power-supply
pins. Typical values of decoupling capacitors are 0.01µF
and 0.1µF. Use a high-quality, ceramic, surface-mount
capacitor, and mount it as close as possible to the VCC
and GND pins of the IC to minimize lead inductance.
Chip Information
SUBSTRATE CONNECTED TO GROUND
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
8 µMAX U8+1 21-0036 90-0092
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DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Ordering Information
V denotes an automotive qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
xxx Denotes factory-programmed custom frequencies. Email custom.oscillators@maxim-ic.com for more information.
PART TEMP RANGE SPREAD SPECTRUM OUTPUT FREQUENCY (MHz) PIN-PACKAGE
DS1091LUA-027+ -40NC to +125NCCenter 27.0 8 FMAX
DS1091LUA-027+T -40NC to +125NCCenter 27.0 8 FMAX
DS1091LUA-033/V+ -40NC to +125NCCenter 33.3 8 FMAX
DS1091LUA-033V+T -40NC to +125NCCenter 33.3 8 FMAX
DS1091LUA-033+ -40NC to +125NCCenter 33.3 8 FMAX
DS1091LUA-033+T -40NC to +125NCCenter 33.3 8 FMAX
DS1091LUA-040/V+ -40NC to +125NCCenter 40.0 8 FMAX
DS1091LUA-040/V+T -40NC to +125NCCenter 40.0 8 FMAX
DS1091LUA-040+ -40NC to +125NCCenter 40.0 8 FMAX
DS1091LUA-040+T -40NC to +125NCCenter 40.0 8 FMAX
DS1091LUA-066/V+ -40NC to +125NCCenter 66.6 8 FMAX
DS1091LUA-066/V+T -40NC to +125NCCenter 66.6 8 FMAX
DS1091LUA-066+ -40NC to +125NCCenter 66.6 8 FMAX
DS1091LUA-066+T -40NC to +125NCCenter 66.6 8 FMAX
DS1091LUA-10A/V+ -40NC to +125NCCenter 10.38 8 FMAX
DS1091LUA-10A/V+T -40NC to +125NCCenter 10.38 8 FMAX
DS1091LUA-200/V+ -40NC to +125NCCenter 0.20 8 FMAX
DS1091LUA-200/V+T -40NC to +125NCCenter 0.20 8 FMAX
DS1091LUA-200+ -40NC to +125NCCenter 0.20 8 FMAX
DS1091LUA-200+T -40NC to +125NCCenter 0.20 8 FMAX
DS1091LUA-330/V+ -40NC to +125NCCenter 33.0 8 FMAX
DS1091LUA-330/V+T -40NC to +125NCCenter 33.0 8 FMAX
DS1091LUA-330+ -40NC to +125NCCenter 33.0 8 FMAX
DS1091LUA-330+T -40NC to +125NCCenter 33.0 8 FMAX
DS1091LUA-xxx+ -40NC to +125NCCenter Custom (contact factory) 8 FMAX
DS1091LUB-008+T -40NC to +125NCDown 8.0 8 FMAX
DS1091LUB-027+ -40NC to +125NCDown 27.0 8 FMAX
DS1091LUB-027+T -40NC to +125NCDown 27.0 8 FMAX
DS1091LUB-033+ -40NC to +125NCDown 33.3 8 FMAX
DS1091LUB-033+T -40NC to +125NCDown 33.3 8 FMAX
DS1091LUB-066+ -40NC to +125NCDown 66.6 8 FMAX
DS1091LUB-066+T -40NC to +125NCDown 66.6 8 FMAX
DS1091LUB-xxx+ -40NC to +125NCDown Custom (contact factory) 8 FMAX
DS1091L
Automotive Temperature Range
Spread-Spectrum EconOscillator™
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical
Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 9
© 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 9/06 Initial release —
1 3/11
Added the continuous power dissipation numbers, lead temperature, and soldering tem-
perature to the Absolute Maximum Ratings section; updated the custom frequency tech-
nical support information; updated the Ordering Information table; added the land pattern
no. to the Package Information table
1, 2, 7
2 9/11 Updated the Ordering Information table 7
