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

4.6

V

Input Voltage, dc

-0.5

V

Output Voltage, dc

-0.5

V

Storage Temperature

-65

150

°C

Ambient Operating Temperature*

-40

85

°C

Junction Temperature

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.