2

Integrated

Circuit

Systems, Inc.

ICS952624

0768B—08/06/03

Pin Description

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

1

FS_A/REF1

I/O

FS_A latched input for frequency select

Reference output, 14.318Hz

2

FS_B/REF0

I/O

FS_B latched input for frequency select

Reference output, 14.318Hz

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 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.

21

48MHz_DOT

OUT

48.008MHz Dot clock output

22

48MHz_USB

OUT

48.008MHz USB clock output

23

GND

PWR

Ground pin.

24

VDD48

PWR

Power for 48MHz output buffers and fixed PLL core.