Rainbow Electronics DS1080L User Manual

General Description

The DS1080L is a low-jitter, crystal-based clock gener­ator with an integrated phase-locked loop (PLL) to gen­erate spread-spectrum clock outputs from 16MHz to
134MHz. The device is pin-programmable to select the
clock multiplier rate as well as the dither magnitude.
The DS1080L has a spread-spectrum disable mode
and a power-down mode to conserve power.

Applications

Automotive

Cable Modems

Cell Phones

Computer Peripherals

Copiers

Infotainment

PCs

Printers

Features

♦ Generates Spread-Spectrum Clocks from 16MHz

to 134MHz

♦ Selectable Clock Multiplier Rates of 1x, 2x, and 4x

♦ Center Spread-Spectrum Dithering

♦ Selectable Spread-Spectrum Modulation

Magnitudes of ±0.5%, ±1.0%, and ±1.5%

♦ Spread-Spectrum Disable Mode

♦ Low Cycle-to-Cycle Jitter

♦ Power-Down Mode with High-Impedance Output

♦ Low Cost

♦ Low Power Consumption

♦ 3.0V to 3.6V Single-Supply Operation

♦ -40°C to +125°C Temperature Operation

♦ Small 8-Lead µSOP Package

DS1080L

Spread-Spectrum Crystal Multiplier

______________________________________________ Maxim Integrated Products 1

SSO

PDNSMSEL

1

2

87X2

V

CC

GND

CMSEL

X1

µSOP

TOP VIEW

3

4

6

5

DS1080L

Pin Configuration

Rev 0; 11/05

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.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

DS1080L+

8 µSOP

-40°C to +125°C

DS1080L

Spread-Spectrum Crystal Multiplier

2 _____________________________________________________________________

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 VCCRelative to GND.........................-0.5V to +3.63V

Voltage on Any Lead Relative

to GND ...............-0.5V to (V

CC

+ 0.5V), not to exceed +3.63V

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 V

CC

(Note 1) 3.0 3.6 V

Input Logic 1 V

IH

0.7 x
V

CC

VCC +

0.3

V

Input Logic 0 V

IL

GND -

0.3

0.3 x
V

CC

V

Input Logic Float I

IF

0v < VIN < V

CC

(Note 2) ±1 µA

Input Leakage I

IL

0V < VIN < V

CC

(Note 3) ±80 µA

SSO < 67MHz 15

67MHz ≤ SSO < 101MHz 10

SSO Load C

SSO

101MHz ≤ SSO < 134MHz 7

pF

Crystal or Clock Input
Frequency

f

IN

16.0 33.4 MHz

Crystal ESR X

ESR

90 Ω

Clock Input Duty Cycle F

INDC

40 60 %

Crystal Parallel Load
Capacitance

C

L

(Note 4) 18 pF

DC ELECTRICAL CHARACTERISTICS

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

PARAMETER

CONDITIONS MIN TYP MAX

UNITS

Supply Current I

CC1

C

SSO

= 15pF, SSO = 16MHz 13 mA

Power-Down Current I

CCQ

PDN = GND, all input pins floating 200 µA

Output Leakage (SSO) I

OZ

PDN = GND -1 +1 µA

Low-Level Output Voltage
(SSO)

V

OL

IOL = 4mA 0.4 V

High-Level Output Voltage
(SSO)

V

OH

IOH = -4mA 2.4 V

Input Capacitance (X1/X2) C

IN

(Note 5) 5 pF

SYMBOL

DS1080L

Spread-Spectrum Crystal Multiplier

_____________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

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

PARAMETER

CONDITIONS MIN TYP MAX

UNITS

SSO Duty Cycle

Measured at VCC / 2 40 60 %

Rise Time t

R

(Note 6) 1.6 ns

Fall Time t

F

(Note 6) 1.6 ns

Peak Cycle-to-Cycle Jitter t

J

f

SSO

= 16MHz, TA = -40 to +85°C,

10,000 cycles (Note 5)

75 ps

16MHz 20

Power-Up Time t

POR

PDN pin (Note 7)

33.4MHz 11

ms

Power-Down Time t

PDN

PDN pin (Notes 8 and 9) 100 ns

Dither Rate

fIN /

Note 1: All voltages referenced to ground.
Note 2: Maximum source/sink current applied to input to be considered a float.
Note 3: Applicable to pins CMSEL, SMSEL, and

PDN.

Note 4: See information about C

L1

and CL2in the Applications Information section at the end of the data sheet.

Note 5: Not production tested.
Note 6: For 7pF load.
Note 7: Time between PDN deasserted to output active.
Note 8: Time between PDN asserted to output high impedance.
Note 9: Guaranteed by design.

SYMBOL

SSODC

f

DITHER

1024