PLL701-50

Low EMI Spread Spectrum Multiplier IC

47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991

www.phaselink.com

Rev 09/20/04 Page 3

FUNCTIONAL DESCRIPTION

Selectable spread spectrum and modulation magnitude

The PLL701-50 provides selectable multiplier factors (1x to 8X), selectable spread spectrum modulation type, as

well as selectable modulation magnitude. Selection is made by connecting specific input pins to a logical “zero” or

“one”. Pins 6 (SC0), 7 (SC1), 8 (SC2) and 12 (SC3) are used as inputs to select the spread spectrum modulation

magnitude as shown on the spread spectrum selection table (page 2). Pins 3 (M2), 4 (M1), 5 (M0) are used as

inputs to select the multiplication factor as shown on the output clock selection table (page 1). Pin 11 is the output

enable pin, which tri-states all outputs when low (logical “zero”).

In order to reduce the number of pins on the chip, the PLL701-50 uses pins 2 and 14 (XOUT/SD0 and REF/SD1) as

bi-directional pins. The pins serve as modulation type selector inputs (SD0 and SD1) upon power-up (see spread

spectrum selection table on page 2), and as XOUT crystal connection (pin 2), and REF output signal (pin 14) as

soon as the inputs have been latched.

Connecting a selection pin to a logical “one”

All selection pins have an internal pull-up resistor (30k

Ω for pins 3, 4, 5, 6, 7, 8, 11, 12, 14 and 120kΩ for pin 2).

This internal pull-up resistor will pull the input value to a logical “one” (pull-up) by default, i.e. when no resistive

load is connected 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. all input pins except XOUT/SD0 (pin 2) and REF/SD1 (pin 14), the pin simply needs to be

grounded to pull the input down to a logical “zero”. For the Bidirectional pins ( pins 2 and 14 ) you will need an

external resistor. For pin 2 a 27k

Ω resistor is recommended and for pin 14 a 4.7kΩ resistor is recommended.

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.