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PLL701-31 Datasheet(PDF) 3 Page - PhaseLink Corporation

Part No. PLL701-31
Description  Low EMI Spread Spectrum Multiplier Clock
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Maker  PLL [PhaseLink Corporation]
Homepage  http://www.phaselink.com
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PLL701-31 Datasheet(HTML) 3 Page - PhaseLink Corporation

   
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PLL701-31
Low EMI Spread Spectrum Multiplier Clock
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 11/28/05 Page 3
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 (30k
Ω 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 27k
Ω resistor to select a
logical “zero”.
ELECTRICAL SPECIFICATIONS
1. Absolute Maximum Ratings
PARAMETERS
SYMBOL
MIN.
MAX.
UNITS
Supply Voltage
VDD
4.6
V
Input Voltage, dc
VI
-0.5
VDD+0.5
V
Output Voltage, dc
VO
-0.5
VDD+0.5
V
Storage Temperature
TS
-65
150
°C
Ambient Operating Temperature*
TA
-40
85
°C
Junction Temperature
TJ
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.


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