PLL702-02

Low EMI Peripheral Clock Generator for Notebook & Motherboards

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

www.phaselink.com

Rev 08/30/05 Page 1

FEATURES

• Single Low EMI IC to replace multiple crystals and

oscillators on Notebooks and Motherboards (27MHz,

10MHz, 14.318MHz, 8MHz, 12MHz, 24.576MHz,

25MHz).

• Selectable crystal input: 24.576MHz or 14.318MHz

(accuracy requirement +/- 20ppm)

• Less than 10ppm Frequency Synthesis error, meeting

AC97, IEEE1394, IEEE802 and USB2.0 frequency

precision specification.

• 27MHz clock with 5 levels of Selectable Spread

Spectrum modulation form +/- 0.5% to +/- 1.5% center.

• 25MHz clock with double drive strength (Ethernet PHY

and MAC).

• 24.576MHz clocks for Audio Codec and IEEE1394.

• 12MHz for USB 2.0.

• Selectable 10MHz and 8MHz for Keyboard controller.

• Dual power source selection for 24.576MHz, 10MHz,

and 12MHz.

• Available in 16-Pin SOIC or TSSOP.

Table 1. SPREAD SPECTRUM SELECTION

SST1

SST0

SST Modulation only on

27MHz. (pin 15)

1

1

+/- 1.5 %

1

0

+/- 1.25 %

1

M

+/- 1 %

0

1

+/- 0.75 %

0

0

+/- 0.5 %

0

M

SST OFF (Default)

Notes: M = Do not connect. 1 = Pulled up. 0 = Pulled down.

Table 2. POWER SELECTION TABLE

VDD_SEL

24.576MHz

(pin 7)

12MHz

(pin 12)

0

VDDB1

VDDB2

1

VDD25M

VDD25M

PIN ASSIGNMENT

POWER GROUPS

• VDDOSC – VSSOSC: XIN, XOUT, analog core and

digital part.

• VDDB1 – VSSB1: 24.576MHz.

• VDDB2 – VSSB2: 27MHz, 10_8MHz, and 12MHz.

•

VDD25M – VSS25M: 25MHz, (10_8MHz, 12MHz,

24.576MHz when power VDDB1, VDDB2 not present).

Table 3. FREQUENCY SELECTION TABLE

10_8MHz ( pin 13 )

SEL10_8

Power Source

Output Frequency

M

VDD25M

8MHz

1

VDDB2

10MHz

0

OFF

-

Table 4. CRYSTAL SELECTION TABLE

Crystal Input

XTAL_SEL

24.576MHz

0

14.318MHz

1

1

2

3

4

5

6

7

8

VDDOSC

9

10

11

12

13

14

15

16

XIN

XOUT

VSSOSC

VSSB1

VDDB1

VDDB2

VSSB2

VSS25M

25MHzx2

VDD25M

Note: 25MHzx2: double drive strength

*: Bi-directional pin

Ω)