PLL701-31
Low EMI Spread Spectrum Multiplier Clock
FEATURE
•
•
•
•
•
•
•
•
•
Spread Spectrum Clock Generator with 1x
outputs.
Output frequency ranges: 10MHz to 30MHz.
Accepts input from crystal or reference clock.
Selectable Center, Down or Asymmetric Spread
Modulation.
Selectable Modulation magnitude.
TTL/CMOS compatible outputs.
3.0V (+/-10%) Supply Voltage.
Low short-term jitter.
Available in 8-Pin 150mil SOIC.
PIN CONFIGURATION
XIN/FIN
XOUT/SD*^
SC0^
SC1^
1
8
VDD
SC2^
FOUT
GND
PLL701-31
2
3
4
7
6
5
XIN/FIN = 10 ~ 30 MHz
Note:
^: Internal pull-up resistor (120kΩ for SD, 30 kΩ for
SC0-SC2).
*: The value of SD is latched upon power-up. The
internal pull-up resistor results in a default high value
when no pull-down resistor is connected to this pin
(recommended external pull-down resistor of 27 kΩ).
DESCRIPTION
The PLL701-31 is a Spread Spectrum Clock
Generator designed to reduce EMI in high-speed
digital systems. The device is designed to operate
from a crystal or reference clock input and provides a
1x modulated clock output. Center, Down and
Asymmetric spread types are selectable as well as
the modulation magnitude.
OUTPUT CLOCK SELECTION
SST Modulation
SD
0
1
1
1
1
1
0
0
0
0
SC2
1
0
0
1
1
1
0
0
0
0
SC1
1
0
1
0
0
1
0
0
1
1
SC0
Magnitude
0
1
0
0
1
0
0
1
0
1
3.75%
3.50%
3.75%
3.25%
3.50%
3.75%
3.25%
3.50%
3.75%
0.00%
Fin / 512
Freq.
D
D
A
D
A
A
C
C
C
Type
-3.75%
-3.50%
+0.125%, -3.625%
-3.25%
+0.125%, -3.375%
+0.25%, -3.5%
+/-1.625 %
+/-1.75%
+/-1.875%
SST OFF
Notes:
A: Asymmetric Spread. D: Down Spread. C: Center Spread.
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 11/28/05 Page 1
PLL701-31
Low EMI Spread Spectrum Multiplier Clock
BLOCK DIAGRAM
XIN/FIN
XOUT
XTAL
OSC
PLL
SST
FOUT
SC(0:2)
SD
Control
Logic
PIN DESCRIPTIONS
Name
XIN/FIN
XOUT/SD
SC0
SC1
SC2
VDD
FOUT
GND
Number
1
2
3
4
7
8
6
5
Type
I
B
I
I
I
P
O
P
Description
Crystal input to be connected to fundamental parallel mode crystal.(C
L
=18pF) or
clock input.
At power-up, this pin is an input pin to select modulation magnitude and type.
After input sampling, this pin is crystal output. Has internal pull up resistor.
Digital control input to select modulation magnitude and type.
Has internal pull-up.
Digital control input to select modulation magnitude and type.
Has internal pull-up.
Digital control input to select modulation magnitude and type.
Has internal pull-up.
3.0(+/-10%)V Power Supply.
Modulated Clock Frequency Output.
Ground.
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 11/28/05 Page 2
PLL701-31
Low EMI Spread Spectrum Multiplier Clock
FUNCTIONAL DESCRIPTION
Selectable spread spectrum modulation types and magnitudes
The PLL701-31 provides selectable spread spectrum modulation type, as well as selectable modulation
magnitude. Selection is made by connecting specific pins to a logical “zero” or “one”, according to the output
clock selection table on page 1.
In order to reduce the number of pins on the chip, the PLL701-31 uses pin 2 (XOUT/SD) as a bi-directional pin.
The pin serves as a modulation type and magnitude selector input (SD) upon power-up (see output clock
selection table on page 1), and as XOUT crystal connection as soon as the input has been latched.
Pins 3 (SC0), 4 (SC1), and 7 (SC2) are used as inputs to complete the spread spectrum modulation type and
magnitude selection as shown on the output clock selection table (page 1).
Connecting a selection pin to a logical “one”
All selection pins have an internal pull-up resistor (30kΩ for pins 3, 4, 7, and 120kΩ for pin 2). This internal pull-
up resistor will pull the input value to a logical “one” by default, i.e. when no connection is made between the pin
and GND. No external pull-up resistor is therefore required for connecting a logical “one” upon power-up.
Connecting a selection pin to a logical “zero”
For an input only pin, i.e. pins 3 (SC0), 4 (SC1), and 7 (SC2), the pin simply needs to be grounded to pull the
input down to a logical “zero”. Pin 2 (XOUT/SD) should be connected to GND thru a 27kΩ resistor to select a
logical “zero”.
ELECTRICAL SPECIFICATIONS
1. Absolute Maximum Ratings
PARAMETERS
Supply Voltage
Input Voltage, dc
Output Voltage, dc
Storage Temperature
Ambient Operating Temperature*
Junction Temperature
Lead Temperature (soldering, 10s)
ESD Protection, Human Body Model
SYMBOL
V
DD
V
I
V
O
T
S
T
A
T
J
MIN.
-0.5
-0.5
-65
-40
MAX.
4.6
V
DD
+0.5
V
DD
+0.5
150
85
125
260
2
UNITS
V
V
V
°C
°C
°C
°C
kV
Exposure of the device under conditions beyond the limits specified by Maximum Ratings for extended periods may cause permanent damage to the
device and affect product reliability. These conditions represent a stress rating only, and functional operations of the device at these or any other
conditions above the operational limits noted in this specification is not implied.
*
Note:
Operating Temperature is guaranteed by design for all parts (COMMERCIAL and INDUSTRIAL), but tested for COMMERCIAL grade only.
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 11/28/05 Page 3
PLL701-31
Low EMI Spread Spectrum Multiplier Clock
2. DC/AC Specifications
PARAMETERS
Supply Voltage
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Output High Voltage
Output Low Voltage
Input Frequency
Maximum interruption of F
IN
Load Capacitance
Pull-up Resistor
Pull-up Resistor
Short Circuit Current
3.3V Dynamic Supply Current
C
L
R
up
R
up
I
sc
I
CC
SYMBOL
V
DD
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
F
XIN
F
IN
CONDITIONS
MIN.
2.7
0.7* V
DD
TYP.
3.0
MAX.
3.3
0.3* V
DD
100
100
UNITS
V
V
V
µA
µA
I
OH
=5mA, V
DD
=3.3V
I
OL
=6mA, V
DD
=3.3V
When using a crystal
When using reference clock
When using reference clock
Between Pin XIN and
XOUT*
PIN 2
PIN 3, 4, 7
No Load
2.4
10
10
18
120
30
50
18
0.4
30
30
100
MHz
MHz
µs
pF
kΩ
kΩ
mA
mA
*Note:
Pin XIN and XOUT each has a 36pF capacitance. When used with a XTAL, the two capacitors combined load the crystal with 18pF. If driving
XIN with a reference clock signal, the load capacitance will be 36pF (typical).
3. Timing Characteristics
PARAMETERS
Rise Time
Fall Time
Output Duty Cycle
Cycle to Cycle Jitter
Cycle to Cycle Jitter
SYMBOL
T
r
T
f
D
T
T
cyc-cyc
T
cyc-cyc
CONDITIONS
Measured at 0.8V ~ 2.0V @ 3.3V
Measured at 2.0V ~ 0.8V @ 3.3V
FOUT=48MHz @ 3.3V
FOUT=72MHz @ 3.3V
MIN.
0.8
0.78
45
TYP.
0.95
0.85
50
MAX.
1.1
0.9
55
100
100
UNITS
ns
ns
%
ps
ps
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 11/28/05 Page 4
PLL701-31
Low EMI Spread Spectrum Multiplier Clock
PACKAGE INFORMATION
8 PIN Narrow SOIC ( mm )
SOIC
Symbol
A
A1
B
C
D
E
H
L
e
Min.
1.47
0.10
0.33
0.19
4.80
3.80
5.80
0.38
1.27 BSC
Max.
1.73
0.25
0.51
0.25
4.95
4.00
6.20
1.27
A1
B
C
L
e
E
H
D
A
ORDERING INFORMATION
For part ordering, please contact our Sales Department:
47745 Fremont Blvd., Fremont, CA 94538, USA
Tel: (510) 492-0990 Fax: (510) 492-0991
PART NUMBER
The order number for this device is a combination of the following:
Device number, Package type and Operating temperature range
PLL701-31 S C X X
PART NUMBER
NONE= TUBE
R= TAPE AND REEL
NONE= NORMAL PACKAGE
L= GREEN PACKAGE
PACKAGE TYPE
S=SOIC
TEMPERATURE
C=COMMERCIAL
I=INDUSTRIAL
Order Number
PLL701-31SC
PLL701-31SC-R
PLL701-31SCL
PLL701-31SCL-R
Marking
P701-31SC
P701-31SC
P701-31SCL
P701-31SCL
Package Option
SOIC-Tube
SOIC-Tape and Reel
SOIC-Tube (GREEN)
SOIC-Tape and Reel (GREEN)
PhaseLink Corporation, reserves the right to make changes in its products or specifications, or both at any time without notice. The information
furnished by Phaselink is believed to be accurate and reliable. However, PhaseLink makes no guarantee or warranty concerning the accuracy of said
information and shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon this product.
LIFE SUPPORT POLICY:
PhaseLink’s products are not authorized for use as critical components in life support devices or systems without the
express written approval of the President of PhaseLink Corporation.
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 11/28/05 Page 5
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