May 2008

PCS3P73U00A

rev 0.3

USB 2.0 Peak EMI reduction IC

2 of 13

Notice: The information in this document is subject to change without notice.

FS

1

2

3

4

5

6

7

8

ModOUT

XIN / CLKIN

SSEXTR

VDD

GND

MR

PCS3P73U00A

XOUT

Pin Configuration

Pin Description

Pin # Pin Name Pin Type

Description

1

XIN /

CLKIN

I

Crystal connection or external reference clock input.

2

XOUT

O

Crystal connection. If using an external reference, this pin should be left open.

3

FS

I

Frequency Select.Pull LOW to select Low Frequency range. Selects High Frequency

range when pulled HIGH. Has an internal pull-up resistor

(see Frequency Selection table for details)

4

GND

P

Ground

5

ModOUT

O

Buffered Modulated clock output

6

MR

I

Modulation Rate Select. When LOW selects Low Modulation Rate.

Selects High Modulation Rate when pulled HIGH. Has an internal pull-down resistor

7

SSEXTR

I

Analog Spread Selection through external resistor to GND.

8

VDD

P

3.3V / 2.5V supply Voltage

Frequency Selection table

VDD(V)

FS

Frequency (MHz)

0

10-20

2.5V

1

20-60

0

10-27

3.3V

1

20-70