General Description
The DS1080L is a low-jitter, crystal-based clock gener-
ator with an integrated phase-locked loop (PLL) to gen-
erate 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
-40C to +125C Temperature Operation
Small 8-Lead SOP Package
DS1080L
Spread-Spectrum Crystal Multiplier
______________________________________________ Maxim Integrated Products
1
SSO
PDN
SMSEL
1
2
8
7
X2
V
CC
GND
CMSEL
X1
SOP
TOP VIEW
3
4
6
5
DS1080L
Pin Configuration
Rev 1; 3/06
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+
-40C to +125C
8 SOP
DS1080L
Spread-Spectrum Crystal Multiplier
2
_____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40C to +125C)
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 V
CC
Relative 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 .........................-40C to +125C
Storage Temperature Range .............................-55C to +125C
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
0.8 x
V
CC
V
CC
+
0.3
V
Input Logic 0
V
IL
GND -
0.3
0.2 x
V
CC
V
Input Logic Float
I
IF
0v < V
IN
< V
CC
(Note 2)
1
A
Input Leakage
I
IL
0V < V
IN
< V
CC
(Note 3)
80
A
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
Clock Input Duty Cycle
F
INDC
40
60
%
Crystal Parallel Load
Capacitance
C
L
(Note 4)
18
pF
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T
A
= -40C to +125C.)
PARAMETER
SYMBOL
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
A
Output Leakage (SSO)
I
OZ
PDN = GND
-1
+1
A
Low-Level Output Voltage
(SSO)
V
OL
I
OL
= 4mA
0.4
V
High-Level Output Voltage
(SSO)
V
OH
I
OH
= -4mA
2.4
V
Input Capacitance (X1/X2)
C
IN
(Note 5)
5
pF
DS1080L
Spread-Spectrum Crystal Multiplier
_____________________________________________________________________
3
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0 to +3.6V, T
A
= -40C to +125C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SSO Duty Cycle
SSODC
Measured at V
CC
/ 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, T
A
= -40 to +85C,
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
f
DITHER
f
IN
/
1024
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 C
L2
in 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.
DS1080L
Spread-Spectrum Crystal Multiplier
4
_____________________________________________________________________
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
DS1080L toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
3.35
3.45
3.55
3.65
3.25
3.05
3.15
2
4
6
8
10
12
0
2.95
AT 16MHz
CMSEL = 4x AT 16MHz
CMSEL = 2x AT 16MHz
CMSEL = 1x AT 16MHz
SUPPLY CURRENT vs. TEMPERATURE
DS1080L toc02
TEMPERATURE (C)
SUPPLY CURRENT (mA)
110
10
60
2
4
6
8
10
12
0
-40
AT 16MHz
CMSEL = 2x AT 16MHz
CMSEL = 4x AT 16MHz
CMSEL = 1x AT 16MHz
SUPPLY CURRENT vs. FREQUENCY
DS1080L toc03
FREQUENCY (MHz)
SUPPLY CURRENT (mA)
31
21
26
2
4
6
8
12
10
16
14
0
16
AT 16MHz
CMSEL = 2x AT 16MHz
CMSEL = 4x AT 16MHz
CMSEL = 1x AT 16MHz
PDN SUPPLY CURRENT vs. TEMPERATURE
DS1080L toc04
TEMPERATURE (C)
PDN SUPPLY CURRENT (mA)
110
10
60
0.05
0.10
0.15
0.20
0.25
0
-40
AT 16MHz
CMSEL = 1x AT 16MHz
CMSEL = 4x AT 16MHz
CMSEL = 2x AT 16MHz
DUTY CYCLE vs. TEMPERATURE
DS1080L toc05
TEMPERATURE (C)
DUTY CYCLE (%)
110
10
60
44
42
48
52
56
46
50
54
58
60
40
-40
AT 16MHz
DUTY CYCLE vs. SUPPLY VOLTAGE
DS1080L toc06
SUPPLY VOLTAGE (V)
DUTY CYCLE (%)
3.55
3.65
3.15
3.35
3.45
3.05
3.25
44
42
48
52
56
46
50
54
58
60
40
2.95
AT 16MHz
OUTPUT DURING
POWER UP AND POWER DOWN
DS1080L toc07
SSO AND PDN
TIME (s)
POWER
DOWN
t
PDN
t
POR
POWER
UP
DS1080L
Spread-Spectrum Crystal Multiplier
_____________________________________________________________________
5
CRYSTAL
OSCILLATOR
1x/2x/4x CLOCK MULTIPLYING
PLL WITH SPREAD SPECTRUM
CONFIGURATION DECODE
AND CONTROL
V
CC
V
CC
GND
NOTE: SEE INFORMATION ABOUT C
L1
AND C
L2
IN THE APPLICATIONS INFORMATION SECTION AT THE END OF THE DATA SHEET.
PDN
SSO
CMSEL
SMSEL
X1
X2
16MHz
TO
33.4MHz
f
SSO
= 16MHz
TO
134MHz
C
L1
C
L2
f
IN
f
SSO
DS1080L
Block Diagram
Pin Description
PIN
NAME
FUNCTION
1
X1
Crystal Drive/Clock Input. A crystal with the proper loading capacitors is connected across X1 and X2.
Instead of a crystal, a clock can be applied at the X1 input.
2
GND
Signal Ground
3
CMSEL
Clock Multiplier Select. Tri-level digital input.
0 = 1x
Float = 2x
1 = 4x
4
SMSEL
Spread-Spectrum Magnitude Select. Tri-level digital input.
0 = 0.5%
Float = 1.0%
1 = 1.5%
5
PDN
Power-Down/Spread-Spectrum Disable. Tri-level digital input.
0 = Power-Down/SSO Tri-Stated
Float = Power-Up/Spread Spectrum Disabled
1 = Power-Up/Spread Spectrum Enabled
6
SSO
Spread-Spectrum Clock Multiplier Output. Outputs a 1x, 2x, or 4x spread-spectrum version of the crystal
or clock applied at the X1/X2 pins.
7
V
CC
Supply Voltage
8
X2
Crystal Drive Output. A crystal with the proper loading capacitors is connected across X1 and X2.
If a clock is connected to X1, then X2 should be left open circuit.
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