Integrated

Circuit

Systems, Inc.

ICS950703

0690D—05/14/04

Pin Description

3

PIN

PIN

PIN

#

NAME

TYPE

1

GND

PWR Ground pin.

2

MULTSEL0/REF0

I/O

3.3V LVTTL input for selection the current multiplier for CPU outputs / 14.318 MHz reference

clock.

3

MULTSEL1/REF1

I/O

3.3V LVTTL input for selection the current multiplier for CPU outputs / 14.318 MHz reference

clock.

4

VDDREF

PWR Ref, XTAL power supply, nominal 3.3V

5

X1

I/O

Frequency select latch input pin / 3.3V PCI free running clock output.

6

X2

I/O

Frequency select latch input pin / 3.3V PCI free running clock output.

7

GNDREF

PWR Ground pin for the REF outputs.

8

PCICLK0

OUT PCI clock output.

9

PCICLK1

I/O

Watchdog enable latch input/ 3.3V PCI clock output.

10

VDDPCI

PWR Power supply for PCI clocks, nominal 3.3V

11

PCICLK2

OUT PCI clock output.

12

PCICLK3

OUT PCI clock output.

13

GNDPCI

PWR Ground pin for the PCI outputs

14

PCICLK4

OUT PCI clock output.

15

PCICLK5

OUT PCI clock output.

16

VDDPCI

PWR Power supply for PCI clocks, nominal 3.3V

17

PCICLK6

OUT PCI clock output.

18

**FS2/PCICLK7

I/O

Frequency select latch input pin / 3.3V PCI clock output.

19

GNDPCI

PWR Ground pin for the PCI outputs

20

**FS3/PCICLK8

I/O

Frequency select latch input pin / 3.3V PCI clock output.

21

**SEL100_133#/PCICLK9

I/O

Latched select input for 100 or 133.3MHz selection. 0=133MHz, 1 = 100MHz / 3.3V PCI

clock output.

22

VDDPCI

PWR Power supply for PCI clocks, nominal 3.3V

23

SDATA

I/O

Data pin for SMBus circuitry, 5V tolerant.

24

GND48

PWR Ground pin for the 48MHz outputs

25

*FS0/48MHz_0

I/O

Frequency select latch input pin / Fixed 48MHz clock output. 3.3V

26

**FS1/48MHz_1

I/O

Frequency select latch input pin / Fixed 48MHz clock output. 3.3V

27

AVDD48

PWR Analog power for 48MHz outputs and fixed PLL core, nominal 3.3V

28

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.

* Internal Pull-Up Resistor ** Internal Pull-Down Resistor ~ This output has 2X drive

DESCRIPTION