2

Integrated

Circuit

Systems, Inc.

ICS952601

0701G—10/13/04

Pin Description

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

1

REF0

OUT

14.318 MHz reference clock.

2

REF1

OUT

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

PCICLK6

OUT

PCI clock output.

21

PD#

IN

Asynchronous active low input pin used to power down the device into a

low power state. The internal clocks are disabled and the VCO and the

crystal are stopped. The latency of the power down will not be greater

than 1.8ms. Internal pull-up of 150K nominal.

22

3V66_0

OUT

3.3V 66.66MHz clock output

23

3V66_1

OUT

3.3V 66.66MHz clock output

24

VDD3V66

PWR

Power pin for the 3V66 clocks.

25

GND

PWR

Ground pin.

26

3V66_2

OUT

3.3V 66.66MHz clock output

27

3V66_3

OUT

3.3V 66.66MHz clock output

28

SCLK

IN

Clock pin of SMBus circuitry, 5V tolerant.