Rainbow Electronics MAX31D80 User Manual
19-5214; Rev 0; 4/10
Typical Application Circuit
MAX31D80
X1
SMSEL1
SMSEL0
GND
X2
XOUT 27MHz CLOCK
DECOUPLING
CAPACITOR
f
IN
= 27MHz
V
CC
fIN = 27MHz
CLKOUT
V
CC
f
CLKOUT
= 100MHz
1.5% DOWN DITHERED
V
CC
Spread-Spectrum Clock Generators
General Description
The MAX31C80/MAX31D80 are spread-spectrum clock
generators that contain a phase-locked loop (PLL)
that generates a 2MHz to 134MHz clock from an input
clock or crystal. The PLL can provide a spread-spectrum down-dithered (MAX31D80) or center-dithered
(MAX31C80) frequency-modulated clock. The devices
also buffer the incoming clock and provide this output
on a separate pin.
The MAX31C80/MAX31D80 are provided in a 10-pin
TDFN package and operate over a full -40NC to +125NC
automotive temperature range. Devices can be factory
programmed for multiple combinations of input and output frequencies (see the Ordering Information table). A
low-cost, low-frequency crystal can be used at the input
to generate frequencies up to 134MHz.
MAX31C80/MAX31D80
Features
S 2MHz to 134MHz Spread-Spectrum Clock
Generator
S Input Can Be Either an 8MHz to 34MHz Crystal or
8MHz to 134MHz Clock
S Factory-Programmable Output Frequencies in
2MHz to 134MHz Range
S Low-Cost Crystal at Low Frequency Used to
Generate High Frequencies
S On-Board PLL is Capable of Spread-Spectrum
Frequency Modulation
S Down- or Center-Dither Spread-Spectrum
Frequency Modulation
S User-Configurable Spread-Spectrum Dither
Magnitude
S Low Cycle-to-Cycle Jitter
S 3.3V Supply Voltage
S Temperature Range: -40NC to +125NC
S Small Package: 10-Pin TDFN (3mm x 3mm x
0.8mm)
Ordering Information
PART TEMP RANGE DITHER MODE PIN-PACKAGE
MAX31C80T-xxx+
MAX31C80T-xxx+T
MAX31D80T-xxx+
MAX31D80T-xxx+T
_______________________________________________________________ Maxim Integrated Products 1
xxx = Factory-programmable output frequency and dither rate (see the Selector Guide table).
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
Selector Guide appears at end of data sheet.
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.
-40NC to +125NC
-40NC to +125NC
-40NC to +125NC
-40NC to +125NC
Applications
Graphics Cards
Set-Top Boxes
Automotive Infotainment
Printers
Center 10 TDFN-EP*
Center 10 TDFN-EP*
Down 10 TDFN-EP*
Down 10 TDFN-EP*
Spread-Spectrum Clock Generators
ABSOLUTE MAXIMUM RATINGS
Voltage Range on VCC Relative to GND ..............-0.3V to +4.3V
Voltage Range on Any Other Pin
Relative to GND .................................... -0.3V to (VCC + 0.3V)*
Continuous Power Dissipation (TA = +70°C)
10-Pin TDFN (derate 24.4mW/°C above +70°C) .....1951.2mW
*Not to exceed +4.3V.
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.
RECOMMENDED OPERATING CONDITIONS
(TA = -40NC to +125NC.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
Input Logic 0
(SMSEL0 and SMSEL1)
Input Logic 1
MAX31C80/MAX31D80
(SMSEL0 and SMSEL1)
Input Logic Unconnected
(SMSEL0 and SMSEL1)
Input Logic 0 for X1 V
Input Logic 1 for X1 V
XOUT Load C
CLKOUT Load C
Crystal Frequency f
Clock Input Frequency f
Crystal ESR X
Clock Input Duty Cycle f
Crystal Parallel Load
Capacitance
CC
V
IL
V
IH
V
IF
IL:X1
IH:X1
L:XOUT
L:CLKOUT
IN
IN
ESR
INDC
C
CL
Limits are in case user wants to force
voltage instead of unconnecting this pin
2MHz P f
67MHz P f
101MHz P f
CLKOUT
CLKOUT
Storage Temperature Range ............................ -55NC to +135NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
3.0 3.3 3.6 V
0.25 x
VCC +
0.55 x
VCC +
< 67MHz
CLKOUT
< 101MHz
P 134MHz
-0.3
0.75 x
V
CC
0.4 x
V
CC
-0.3
0.7 x
V
CC
8 34 MHz
8 134 MHz
40 60 %
V
CC
0.3
V
CC
0.3 x
V
CC
0.3
15 pF
15
10
7
90
18 pF
pF
V
V
V
V
V
I
2 ______________________________________________________________________________________
Spread-Spectrum Clock Generators
DC ELECTRICAL CHARACTERISTICS
(3.0V P VCC P 3.6V, TA = -40NC to +125NC, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current I
Input Leakage
(SMSEL0 and SMSEL1)
Low-Level Output Voltage
(XOUT and CLKOUT)
High-Level Output Voltage
(XOUT and CLKOUT)
Input Capacitance
(X1 and X2)
DD
I
IL
V
OL
V
OH
C
IN
fIN = 27MHz, f
dithered, CL = 10pF
SMSEL_ = GND or V
IOL = 10mA 0.2 V
IOH = -10mA
CLKOUT
AC ELECTRICAL CHARACTERISTICS
(3.0V P VCC P 3.6V, TA = -40NC to +125NC, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CLKOUT Duty Cycle f
XOUT Duty Cycle f
Rise Time t
Fall Time t
Dither Rate Range f
Dither Rate Accuracy -4 +4 %
Peak Cycle-to-Cycle Jitter t
Power-Up Time t
CLKOUT:DCCL:CLKOUT
C
XOUT:DC
R
F
DR
J
PUP
L:XOUT
VCC = 3.3V
C
L:CLKOUT
C
L:CLKOUT
Factory programmable 20 40 kHz
CLKOUT = 100MHz, 10,000 cycles,
TA = +25NC
VCC valid to output active, TA = +25NC,
VCC = 3.3V
= 7pF 40 60
= 7pF, TA = +25NC,
= 7pF 1.6 ns
= 7pF 1.6 ns
= 100MHz, down
CC
22 mA
Q15 FA
VCC -
0.2
5 pF
40 60
75 ps
1 ms
MAX31C80/MAX31D80
V
%
_______________________________________________________________________________________ 3
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