2

Integrated

Circuit

Systems, Inc.

ICS952606

0717F—06/10/05

Pin Description

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

1

*FSA/REF0

I/O

Frequency select latch input pin / 14.318 MHz reference clock.

2

*FSB/REF1

I/O

Frequency select latch input pin / 14.318 MHz reference clock.

3

VDDREF

PWR

Ref, XTAL power supply, nominal 3.3V

4X1

IN

Crystal input, Nominally 14.318MHz.

5

X2

OUT

Crystal output, Nominally 14.318MHz

6

GND

PWR

Ground pin.

7

PCICLK_F0

OUT

Free running PCI clock not affected by PCI_STOP# .

8

PCICLK_F1

OUT

Free running PCI clock not affected by PCI_STOP# .

9

PCICLK_F2

OUT

Free running PCI clock not affected by PCI_STOP# .

10

VDDPCI

PWR

Power supply for PCI clocks, nominal 3.3V

11

GND

PWR

Ground pin.

12

PCICLK0

OUT

PCI clock output.

13

PCICLK1

OUT

PCI clock output.

14

PCICLK2

OUT

PCI clock output.

15

PCICLK3

OUT

PCI clock output.

16

VDDPCI

PWR

Power supply for PCI clocks, nominal 3.3V

17

GND

PWR

Ground pin.

18

PCICLK4

OUT

PCI clock output.

19

PCICLK5

OUT

PCI clock output.

20

PD#

IN

Asynchronous active low input pin, with 120Kohm internal pull-up

resistor, used to power down the device. The internal clocks are

disabled and the VCO and the crystal are stopped.

21

48MHz_DOT

OUT

48MHz clock output.

22

48MHz_USB

OUT

48MHz clock output.

23

GND

PWR

Ground pin.

24

VDD48

PWR

Power pin for the 48MHz output.3.3V