Preliminary
PLL701-21
Low EMI Spread Spectrum Multiplier Clock
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 05/12/05 Page 1
FEATURES
Spread Spectrum Clock Generator with selectable
SST mode.
Output frequency ranges: 24MHz to 200MHz.
Selectable Center Spread Modulation.
TTL/CMOS compatible outputs.
3.3V Operating Voltage.
Low short-term jitter.
Available in 8-Pin 150mil SOIC.
DESCRIPTION
The PLL701-21 is a Spread Spectrum Clock
Generator designed for the purpose of reducing EMI
in high-speed digital systems, with selectable Center
Spread modulation magnitude (see table below). The
device operates over a very wide range of input
frequencies and provides a 1x modulated clock
output.
PIN CONFIGURATION
Note: v: 30k
Internal Pull down. ^: 30k Internal Pull up.
SST BY-PASS SELECTOR
S3 Spread
Spectrum
Mode
0 OFF
1
ON (See below) Default
Note: S3 has an internal Pull Up. Default="1"
MODULATION MAGNITUDE SELECTION
Spread Spectrum Modulation
S2 S1 S0 FIN Range
(MHz)
FOUT
Frequency Magnitude
0 0 0 24
-
200
X1
0.75%
0 0 1 24
-
200
X1
1.00%
0 1 0 24
-
200
X1
1.25%
0 1 1 24
-
200
X1
0.125%
1 0 0 24
-
200
X1
0.25%
1 0 1 24
-
200
X1
0.50%
1 1 0 24
-
200
X1
0.375%
1 1 1 24
-
200
X1
Fin / 1024
0.625%
PLL
701-21
1
2
3
4
5
6
7
8
FIN
S2^
S1^
S0
v
VDD
FOUT
GND
S3^
FIN = 24 ~ 200 Mhz
Preliminary
PLL701-21
Low EMI Spread Spectrum Multiplier Clock
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 05/12/05 Page 2
BLOCK DIAGRAM
PIN DESCRIPTIONS
Name Number
Type
Description
FIN
1
I
Input Clock Frequency. 24MHz to 200MHz.
S2 2
I
Digital control input for SST modulation magnitude selection. Has internal pull-
up.
S1 3
I
Digital control input for SST modulation magnitude selection. Has internal pull-
up.
S0 4
I
Digital control input for SST modulation magnitude selection. Has internal pull-
down.
GND 5 P
Ground.
FOUT
6
O
SST Modulated Clock Frequency Output.
S3
7
I
SST By-Pass Selector. S3 has internal pull-up. Default ="1"
VDD 8 P
3.3V
Power
Supply.
ELECTRICAL SPECIFICATIONS
1. Absolute Maximum Ratings
PARAMETERS SYMBOL
MIN.
MAX.
UNITS
Supply Voltage
V
DD
4.6 V
Input Voltage, dc
V
I
-0.5
V
DD
+0.5 V
Output Voltage, dc
V
O
-0.5
V
DD
+0.5 V
Storage Temperature
T
S
-65 150
C
Ambient Operating Temperature*
T
A
-40 85
C
Junction Temperature
T
J
125
C
Lead Temperature (soldering, 10s)
260
C
ESD Protection, Human Body Model
2
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.
FOUT
FIN
S(0:3)
PLL
SST
Control
Logic
Preliminary
PLL701-21
Low EMI Spread Spectrum Multiplier Clock
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 05/12/05 Page 3
2. DC/AC Specifications
PARAMETERS SYMBOL CONDITIONS MIN.
TYP.
MAX.
UNITS
Supply Voltage
V
DD
2.97 3.63 V
Input High Voltage
V
IH
0.7*
V
DD
V
Input Low Voltage
V
IL
0.3*
V
DD
V
Input High Current
I
IH
100
A
Input Low Current
I
IL
100
A
Output High Voltage
V
OH
I
OH
=5mA, V
DD
=3.3V
2.4
V
Output Low Voltage
V
OL
I
OL
=6mA, V
DD
=3.3V
0.4
V
Input Frequency
F
IN
24
200
MHz
Maximum interruption of F
IN
100
s
Input Capacitance
C
in1
4 pF
Pull-up Resistor
R
pu
PIN 2, 3, 7
30
k
Pull-down Resistor
R
pd
PIN
4
30 k
Short Circuit Current
I
sc
50 mA
3.3V Dynamic Supply Current
I
CC
No
Load
20 mA
3. TIMING CHARACTERISTICS
PARAMETERS SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNITS
Rise Time
T
r
Measured at 0.8V ~ 2.0V @ 3.3V
0.8
0.95
1.1
ns
Fall Time
T
f
Measured at 2.0V ~ 0.8V @ 3.3V
0.78
0.85
0.9
ns
Output Duty Cycle
D
T
45 50 55 %
Input to Output Delay
2
4
ns
Cycle to Cycle Jitter
T
cyc-cyc
Over output frequency range @ 3.3V
100
ps
FUNCTIONAL DESCRIPTION
Selectable spread spectrum and modulation rates
The PLL701-21 provides Center Spread modulation, as well as a selectable modulation magnitude. Selection is
made by connecting pins 2 (S2), 3 (S1) and 4 (S0) to a logical "zero" or "one", according to the modulation
magnitude selection table on page 1.
Default values for S(0:3) through internal pull-up and pull-down resistor
Selection pin 4 (S0) has an internal pull-down resistor of 30k
while pins 2, 3 and 7 (S2, S1 and S3) have an
internal pull-up resistor of 30k
. This internal pull-down (or pull-up) resistor will pull the input value to a logical
"zero" (or "one" respectively) by default, i.e. when no connection is made between the pin and VDD (GND
respectively). In order to override the internal pull-down (pull-up), the pin has to be connected to VDD (GND
respectively).
Preliminary
PLL701-21
Low EMI Spread Spectrum Multiplier Clock
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 05/12/05 Page 4
PACKAGE INFORMATION
ORDERING INFORMATION
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.
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
PLL701-21 S C
Order Number
Marking
Package Option
PLL701-21SC-R P701-21SC
SOIC -Tape and Reel
PLL701-21SC P701-21SC
SOIC
-Tube
PART NUMBER
TEMPERATURE
C=COMMERCIAL
I=INDUSTRIAL
PACKAGE TYPE
S=SOIC
C
L
A
8 PIN Narrow SOIC ( mm )
SOIC
Symbol
Min.
Max.
A
1.47
1.73
A1
0.10
0.25
B
0.33
0.51
C
0.19
0.25
D
4.80
4.95
E
3.80
4.00
H
5.80
6.20
L
0.38
1.27
e
1.27 BSC
E
H
D
A1
e
B
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