DS1091LN-66+ - Hytronics

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 out-

put 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

♦Spread-Spectrum Clock Output from 130kHz to

66.6MHz

♦Operating Temperature Range of -40°C to +125°C

♦Accuracy of ±1.75% Across Temperature and

Voltage

♦Factory Trimmed

♦Center-Dithered (DS1091LA) or Down-Dithered

(DS1091LB) Spread-Spectrum Output

♦Pin-Selectable Center-Dither Magnitude of 0%,

±1%, ±2%, or ±4%

♦Pin-Selectable Down-Dither Magnitude of 0%, -2%,

-4%, or -8%

♦Pin-Selectable Dither Rate

♦3.0V to 3.6V Supply Operation

♦Lead-Free 8-Pin µMAX Package

DS1091L

Automotive Temperature Range

Spread-Spectrum Econoscillator

______________________________________________

Maxim Integrated Products

N.C.

SEL0SEL1

GND

VCC

OUT

µMAX

TOP VIEW

DS1091L

Pin Configuration

OUT DR

8 µMAX

DS1091L

VCC

fOUT

DECOUPLING

CAPACITORS

5SEL0

VCC

N.C.

SEL1

GND

VCC

Typical Operating Circuit

Rev 1; 6/07

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.

Denotes lead-free package.

xxx

Denotes factory-programmed custom frequencies.

Email Custom_EconOscillators_Info@dalsemi.com for information/questions concerning custom frequencies.

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

Ordering Information

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

DS1091LUA-027+ -40°C to +125°C 8 µMAX Center 27.0

DS1091LUA-033+ -40°C to +125°C 8 µMAX Center 33.3

DS1091LUA-066+ -40°C to +125°C 8 µMAX Center 66.6

DS1091LUA-xxx+ -40°C to +125°C 8 µMAX Center Custom (Contact Factory)

DS1091LUB-027+ -40°C to +125°C 8 µMAX Down 27.0

DS1091LUB-033+ -40°C to +125°C 8 µMAX Down 33.3

DS1091LUB-066+ -40°C to +125°C 8 µMAX Down 66.6

DS1091LUB-xxx+ -40°C to +125°C 8 µMAX Down Custom (Contact Factory)

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED OPERATING CONDITIONS

(TA= -40°C to +125°C.)

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.

Voltage on VCC Relative to Ground.......................-0.5V to +6.0V

Voltage on DR, SEL0, SEL1 Relative

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

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

Storage Temperature Range .............................-55°C to +125°C

Soldering Temperature...................See J-STD-020 Specification

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

DC ELECTRICAL CHARACTERISTICS

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

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 = 0 -1 µA

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

This voltage must not exceed 6.0V.

AC ELECTRICAL CHARACTERISTICS

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Output Frequency Range fOUT (Note 3) 0.130 66.6 MHz

VCC = 3.3V, TA = +25°C -0.25 0 +0.25

Across TA and VCC -1.75 +1.75Output Center Frequency Tolerance ΔfOUT

0°C to +70°C, across VCC -1.2 +1.2

Power-Up Time tPU (Note 4) 0.1 ms

Load Capacitance CL15 50 pF

DS1091L

Automotive Temperature Range

Spread-Spectrum Econoscillator

2 _____________________________________________________________________

DS1091L

Automotive Temperature Range

Spread-Spectrum Econoscillator

_____________________________________________________________________ 3

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.

Typical Operating Characteristics

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

AC ELECTRICAL CHARACTERISTICS (continued)

(TA= -40°C to +125°C; VCC = +3.0V to +3.6V.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

< 33.3MHz (Note 3) 50

Duty Cycle ≥ 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

ICC 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

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. VCC

DS1091L toc04

VCC (V)

DUTY CYCLE (%)

fOUT = 66MHz

fOUT = 130kHz

NO DITHER

-40 -15 10 35 60 85 110

DUTY CYCLE vs. TEMPERATURE

DS1091L toc05

TEMPERATURE (°C)

DUTY CYCLE (%)

fOUT = 66MHz

fOUT = 130kHz

NO DITHER

DS1091L

Automotive Temperature Range

Spread-Spectrum Econoscillator

4 _____________________________________________________________________

Typical Operating Characteristics (continued)

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

Pin Description

µMAX8 NAME FUNCTION

1 OUT Spread-Spectrum Clock Output

CC Supply Voltage

3 GND Ground

4 SEL1

5 SEL0 Spread Spectrum Dither Magnitude Select Inputs. Selects dither magnitude (see Table 1).

6, 7 N.C. No Connection

8 DR Spread-Spectrum Dither Rate Selector. Selects dither rate (see Table 2).

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

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)

±1%

±2%

±4%

8dB 11dB 14dB

fOUT = 33.3MHz

RBW = 120kHz

CENTER 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

Detailed Description

The DS1091L is a clock generator that is capable of

output frequencies from 130kHz to 66.6MHz over the

full automotive temperature range (-40°C to +125°C).

The device also is capable of producing a spread-

spectrum (dithered) square-wave output using four pin-

selectable dither percentages. Both center (DS1091LA)

and down (DS1091LB) 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 has the ability to reduce radiated emis-

sion 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 (for the DS1091LB

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

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

shows a plot of the output frequency versus time.

where n is defined in Table 2 as a function of output fre-

quency. For example, for an output frequency of

27.0MHz, the dither rate would be 13.2kHz for DR = 0

and 6.6kHz for DR = 1.

DITHER RATE fOUT

DS1091L

Automotive Temperature Range

Spread-Spectrum Econoscillator

_____________________________________________________________________ 5

Block Diagram

FACTORY-PROGRAMMED

MASTER OSCILLATOR

DITHER RATE DIVIDER TRIANGLE WAVE GENERATOR

(DITHER %)

FACTORY-PROGRAMMED

PRESCALER

SEL0SEL1DR

OUT

fOUT

VCC

GND

WHERE fMOSC IS THE MASTER OSCILLATOR FREQUENCY.

fMOSC

fDITHER

fMOSC

DS1091L

Table 1.

DITHER MAGNITUDE

SEL1

LOGIC LEVEL

SEL0

LOGIC LEVEL DS1091LA DS1091LB

0 0 No Dither No Dither

0 1 ±1% -2%

1 0 ±2% -4%

1 1 ±4% -8%

Table 2.

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

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.

_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

is a registered trademark of Dallas Semiconductor Corporation.

Springer

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 initial power-up.

DS1091L Frequency Spreading Profile as a

Function of Dither %

Application 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.

Requesting Custom Frequencies

Email Custom_EconOscillators_Info@dalsemi.com for

information/questions concerning custom frequencies.

Chip Topology

TRANSISTOR COUNT: 4887

SUBSTRATE CONNECTED TO GROUND

Package Information

For the latest package outline information, go to

www.maxim-ic.com/DallasPackInfo.

Revision History

Pages changed at Rev 1: 1, 6.

TIME

DITHER FREQ

PROGRAMMED fOUT

PROGRAMMED fOUT-

(2%, 4%, OR 8% OF fOUT)

DITHER

AMOUNT

(-2%, -4%,

OR -8%)

IF DITHER AMOUNT = 0%

fOUT

Figure 1B. Down 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

Figure 1A. Center Dithered

ENGLISH • ???? • ??? • ???

WHAT'S NEW

PRODUCTS

SOLUTIONS

DESIGN

APPNOTES

SUPPORT

BUY

COMPANY

MEMBERS

DS1091L

Part Number Table

Notes:

See the DS1091L QuickView Data Sheet for further information on this product family or download the

DS1091L full data sheet (PDF, 120kB).

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.2.

Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within

one business day.

Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: See full

data sheet or Part Naming Conventions.

* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product

uses.

Part Number

Free

Sample

Buy

Direct

Package:

TYPE PINS SIZE

DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?

Materials Analysis

DS1091LN-66+

TDFN;6 pin;118

Dwg: 21-0137I (PDF)

Use pkgcode/variation: T633+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUB-066+

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUB-033+

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUB-027+

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUA-066+

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUA-033+

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUA-027+

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUB-066+T

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUB-033+T

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUB-027+T

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUA-066+T

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUA-033+T

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LUA-027+T

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

DS1091LU-66+

uSOP;8 pin;118

Dwg: 21-0036J (PDF)

Use pkgcode/variation: U8+1*

-40C to +85C

RoHS/Lead-Free: Yes

Materials Analysis

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