MAX31091AUA/V+330 - Maxim Integrated

EconOscillator is a trademark and µMAX is a registered trademark of Maxim Integrated Products, Inc.

Ordering Information appears at end of data sheet.

Custom Frequency Options

Contact factory for available custom frequency options.

19-7303; Rev 2; 11/18

General Description

The MAX31091 is a low-cost clock generator that is

factory trimmed to output frequencies from 200kHz to

66.6MHz with a nominal accuracy of ±0.25%. The device

can also produce a center-spread-spectrum output with

pin-selectable dither magnitude and rate. Assembled in

an 8-pin μMAX® package, the MAX31091 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

●Navigation

●Advanced Driver Assistance System (ADAS)

●Engine Control Unit (ECU) Instrumentation

●Automotive

Benets and Features

●Spread-Spectrum Clock Output from 200kHz to

66.6MHz

●-40°C to +125°C Operating Temperature Range

●±1.75% Accuracy Across Temperature

●Factory Trimmed

●Center-Dithered Spread-Spectrum Output

●Pin-Selectable Center-Dither Magnitude of 0%, ±1%,

±2%, or ±4%

●Pin-Selectable Dither Rate

●3.0V to 3.6V Supply Operation

● Lead(Pb)-Free, 8-Pin μMAX Package

●AEC-Q100 Qualified

Click here for production status of specic part numbers.

Typical Operating Circuit

OUT DR

VCC

fOUT

DECOUPLING

CAPACITORS

5SEL0

VCC

N.C.

SEL1

GND

VCC

MAX31091

MAX31091 Automotive Temperature Range

Spread-Spectrum EconOscillator™

Voltage Range on VCC Relative to Ground .........-0.5V to +4.0V

Voltage Range on DR, SEL0, SEL1

Relative to Ground...............................-0.5V to (VCC + 0.5V)*

Continuous Power Dissipation (TA = +70°C)

µMAX (derate 4.8mW/°C above +70°C) .....................390mW

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

*This voltage must not exceed 4.0V.

8 μMAX

PACKAGE CODE U8+4

Outline Number 21-0036

Land Pattern Number 90-0092

Thermal Resistance, Multi-Layer Board:

Junction to Ambient (θJA) 206°C/W

Junction to Case (θJC) 42°C/W

Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.

For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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 Information

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 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.

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│

MAX31091 Automotive Temperature Range

Spread-Spectrum EconOscillator™

Recommended Operating Conditions

(TA = -40°C to +125°C, unless otherwise noted.)

DC Electrical Characteristics

(VCC = +3.0V to +3.6V, TA = -40°C to +125°C, unless otherwise noted.)

AC Electrical Characteristics

(VCC = +3.0V to +3.6V, TA = -40°C to +125°C, unless otherwise noted.)

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.

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

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 µA

Low-Level Input Current

(SEL0, SEL1, DR) IIL VIL = 0V -1 µA

Supply Current (Active) ICC (Note 2) 16 mA

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Output Frequency Range fOUT (Note 3) 0.200 66.6 MHz

Output Center Frequency

Tolerance ∆fOUT

VCC = 3.3V, TA = +25°C -0.25 0 +0.25

%Across TA and VCC = 3.3V -1.75 +1.75

0°C to +70°C and VCC = 3.3V -1.2 +1.2

Power-Up Time tPU (Note 4) 0.1 ms

Load Capacitance CL 15 50 pF

Duty Cycle < 33.3MHz (Note 3) 50 %

≥ 33.3MHz (Note 3) 40 60

Jitter (RMS), 50MHz 0.3 %

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│

MAX31091 Automotive Temperature Range

Spread-Spectrum EconOscillator™

Typical Operating Characteristics (continued)

(VCC = 3.3V, TA = +25°C, unless otherwise noted.)

46.5

47.5

48.5

49.5

50.5

33.2 3.4 3.6

DUTY CYCLE (%)

VCC (V)

DUTY CYCLE vs. SUPPLY VOLTAGE

NO DITHER

fOUT = 66MHz

fOUT = 200kHz

toc04

-40 10 60 110

DUTY CYCLE (%)

TEMPERATURE (°C)

DUTY CYCLE vs. TEMPERATURE

NO DITHER

fOUT = 66MHz

fOUT = 200kHz

toc05

0.5

1.5

2.5

3.5

OUTPUT (V)

TIME (ns)

OUTPUT RISE TIME

RISE TIME

= 1.02nS

TYPICAL AT

12pF LOAD

toc06

0.5

1.5

2.5

3.5

OUTPUT (V)

TIME (ns)

OUTPUT FALL TIME

RISE TIME

= 1.12nS

TYPICAL

AT 12pF

LOAD

toc07

-35

-30

-25

-20

-15

-10

-5

31.9 32.9 33.9

ATTENUATION (dB)

FREQUENCY (MHz)

SPECTRUM ATTENUATION vs. FREQUENCY

AT DIFFERNET DITHER AMPLITUDES

fOUT = 33.3MHz

RBW = 120kHz

CENTER DITHER

8dB

11dB

14dB

toc08

6.5

7.5

8.5

9.5

-40 10 60 110

ICC (mA)

TEMPERATURE (°C)

SUPPLY CURRENT vs. TEMPERATURE

VCC = 3.3V

VCC = 3.6V

= 3.0V

fOUT = 66MHz

toc01

-1.75

-1.25

-0.75

-0.25

0.25

0.75

1.25

1.75

-40 10 60 110

FREQUENCY VARIATION (%)

TEMPERATURE (°C)

FREQUENCY VARIATION

vs. TEMPERATURE

VCC = 3.3V

NO DITHER

fOUT = 66MHz

OUT

= 200kHz

toc02

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

33.2 3.4 3.6

FREQUENCY VARIATION (%)

VCC (V)

FREQUENCY VARIATION

vs. VOLTAGE

NO DITHER

fOUT

= 66MHz

fOUT = 200kHz

toc03

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MAX31091 Automotive Temperature Range

Spread-Spectrum EconOscillator™

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).

N.C.

SEL0SEL1

GND

VCC

OUT

µMAX

TOP VIEW

MAX31091

FACTORY-PROGRAMMED

MASTER OSCILLATOR

DITHER RATE DIVIDER TRIANGLE-WAVE GENERATOR

(DITHER %)

FACTORY-PROGRAMMED

PRESCALER

SEL0SEL1DR

OUT

fOUT

VCC

GND

fMOSC IS THE MASTER OSCILLATOR FREQUENCY.

fMOSC

fDITHER

fMOSC

MAX31091

Block Diagram

Pin Conguration Pin Description

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│

MAX31091 Automotive Temperature Range

Spread-Spectrum EconOscillator™

Detailed Description

The MAX31091 clock generator is capable of output

frequencies from 200kHz to 66.6MHz over the full automotive

temperature range (-40°C to +125°C). The device can also

produce a spread-spectrum (dithered) square-wave output

using four pin-selectable dither percentages. The device also

features two selectable dither rates.

The MAX31091 is shipped from the factory-programmed

to a customer-specified frequency.

Spread Spectrum

The MAX31091 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

programmed frequency.

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

setting of the DR pin (see the equation below). Figure 1

shows a plot of the output frequency vs. time.

OUT

DITHER RATE

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 MAX31091 output is

held in the low state until tPU has elapsed. This removes

any possibility of erroneous output transitions during initial

power-up.

Figure 1A

SEL1

LOGIC LEVEL

SEL0

LOGIC LEVEL

DITHER MAGNITUDE (%)

MAX31091AUA

0 0 No dither

0 1 Q1

1 0 Q2

1 1 Q4

OUTPUT FREQUENCY fOUT

(MHz) n

fOUT (min) fOUT (max) DR = LOGIC

LEVEL 1

DR = LOGIC

LEVEL 0

0.200 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

Table 1. Dither Magnitude

Table 2. Value of n w.r.t. Output Frequency

MAX31091 Frequency Spreading Prole as a Function of Dither %

Figure 1. Center Dithered

TIME

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

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│

MAX31091 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.

PART TEMP RANGE SPREAD SPECTRUM OUTPUT FREQUENCY (MHz) PIN-PACKAGE

MAX31091AUA/V+033 -40°C to +125°C Center 33.3 8 μMAX

MAX31091AUA/V+T033 -40°C to +125°C Center 33.3 8 μMAX

MAX31091AUA/V+066 -40°C to +125°C Center 66.6 8 μMAX

MAX31091AUA/V+T066 -40°C to +125°C Center 66.6 8 μMAX

MAX31091AUA/V+172 -40°C to +125°C Center 1.7 8 μMAX

MAX31091AUA/V+T172 -40°C to +125°C Center 1.7 8 μMAX

MAX31091AUA/V+200 -40°C to +125°C Center 0.20 8 μMAX

MAX31091AUA/V+T200 -40°C to +125°C Center 0.20 8 μMAX

MAX31091AUA/V+330 -40°C to +125°C Center 33.0 8 μMAX

MAX31091AUA/V+T330 -40°C to +125°C Center 33.0 8 μMAX

MAX31091AUA/V+192 -40°C to +125°C Center 1.9 8 μMAX

MAX31091AUA/V+T192 -40°C to +125°C Center 1.9 8 μMAX

MAX31091AUA/V+400 -40°C to +125°C Center 0.4 8 μMAX

MAX31091AUA/V+T400 -40°C to +125°C Center 0.4 8 μMAX

MAX31091AUA/V+027 -40°C to +125°C Center 27 8 μMAX

MAX31091AUA/V+T027 -40°C to +125°C Center 27 8 μMAX

/V denotes an automotive qualified part.

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Ordering Information

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND

PATTERN NO.

8 µMAX U8+4 21-0036 90-0092

Package Information

For the latest package outline information and land patterns (foot-

prints), go to www.maximintegrated.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.

Chip Information

SUBSTRATE CONNECTED TO GROUND

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│

MAX31091 Automotive Temperature Range

Spread-Spectrum EconOscillator™

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 3/14 Initial release —

1 9/17 Added AEC-Q100 statement to Benets and Features section, updated General Description

and updated Ordering Information table 1, 7

2 11/18 Updated Applications, Absolute Maximum Ratings, and Ordering Information, added

Package Information section 1, 2, 7

Revision History

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses

are implied. Maxim Integrated reserves the right to change the circuitry and specications 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.

│

MAX31091 Automotive Temperature Range

Spread-Spectrum EconOscillator™

For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.

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MAX31091AUA/V+T033 MAX31091AUA/V+T330 MAX31091AUA/V+172 MAX31091AUA/V+066

MAX31091AUA/V+T200 MAX31091AUA/V+033 MAX31091AUA/V+330 MAX31091AUA/V+T066

MAX31091AUA/V+T172 MAX31091AUA/V+200