Maxim Integrated Producs DS1080CL Datasheet
DS1080CL
Spread-Spectrum Crystal Multiplier
________________________________________________________________
Maxim Integrated Products
1
Rev 0; 5/08
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.
General Description
The DS1080CL is a low-jitter, crystal-based clock generator with an integrated phase-locked loop (PLL) to
generate spread-spectrum clock outputs from 8MHz to
64MHz. The device is pin programmable to select the
clock multiplier rate as well as the dither magnitude.
The DS1080CL has a spread-spectrum disable mode
and a power-down mode to conserve power.
Applications
Features
♦ Generates Spread-Spectrum Clocks from 8MHz to
64MHz
♦ 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-Pin µSOP Package
SSO
PDNSMSEL
1
2
87X2
V
CC
GND
CMSEL
X1
TOP VIEW
3
4
6
5
DS1080CL
+
Pin Configuration
+
Denotes a lead-free package.
T = Tape and reel.
Ordering Information
Automotive
Cable Modems
Cell Phones
Computer Peripherals
Copiers
Infotainment
PCs
Printers
X2
NOTE: IN THE ABOVE CONFIGURATION WITH PDN CONNECTED TO VCC, SMSEL CONNECTED TO GND, AND CMSEL FLOATING, THE DEVICE IS IN NORMAL
OPERATION WITH 2x CLOCK MULTIPLICATION AND A SPREAD-SPECTRUM MAGNITUDE OF ±0.5%.
f
SSO
V
CC
V
CC
V
CC
SSO
PDN
X1
CRYSTAL
C
L1
C
L2
DECOUPLING
CAPACITOR
GND
CMSEL
SMSEL
8
7
6
5
1
2
3
4
DS1080CL
Typical Operating Circuit
PART TEMP RANGE PIN-PACKAGE
DS1080CLU+ -40°C to +125°C 8 μSOP
DS1080CLU+T -40°C to +125°C 8 μSOP
DS1080CL
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 Range on VCCRelative to GND .............-0.5V to +3.63V
Voltage Range on Any Pin 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...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
DC ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +3.6V, TA= -40°C to +125°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage VCC (Note 1) 3.0 3.6 V
Input Logic 1 V
Input Logic 0 V
Input Logic Float IIF 0V < VIN < V
Input Leakage IIL 0V < VIN < V
SSO Load C
Crystal or Clock Input
Frequency
Crystal ESR X
Cloc k Input Duty Cycle F
Crystal Parallel Load
Capacitance
IH
IL
15 pF
SSO
f
8 16 MHz
IN
90
ESR
40 60 %
INDC
C
(Note 4) 18 pF
L
0.8 x
V
CC
GND -
0.3
(Note 2) ±1 μA
CC
(Note 3) ±80 μA
CC
VCC +
0.3
0.2 x
V
CC
V
V
PARAMETER SYMBOL CONDITIONS MIN TYP MA X UNITS
Supply Current I
Power-Down Current I
Output Leakage (SSO) I
Low-Leve l Output Voltage
(SSO)
High-Level Output Voltage
(SSO)
Input Capacitance (X1/X2) CIN (Note 5) 5 pF
C
CC1
CCQ
OZ
V
IOL = 4mA 0.4 V
OL
V
IOH = -4mA 2.4 V
OH
= 15pF, SSO = 8MHz 7 12 mA
SSO
PDN = GND, all input pins floating 200 μA
PDN = GND -1 +1 μA
DS1080CL
Spread-Spectrum Crystal Multiplier
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(VCC= +3.0 to +3.6V, TA= -40°C to +125°C.)
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.
Note 5: Not production tested.
Note 6: For 15pF 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.
PARAMETER SYMBOL CONDITIONS MIN TYP MA X UNITS
SSO Duty C yc le SSODC Measured at VCC/2 45 55 %
Rise Time tR (Note 6) 1.6 ns
Fal l Time tF (Note 6) 1.6 ns
f
= 8MHz, TA = -40°C to +85°C,
Peak Cycle-to-Cycle Jitter t
Power-Up Time t
Power-Down Time t
Dither Rate f
DITHER
J
POR
PDN
SSO
10,000 cyc les (Note 5)
PDN pin (Note 7)
PDN pin (Notes 8, 9) 100 ns
fIN/512
8MHz 20
16MHz 10
75 ps
ms
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