2

ICS9341

Pin Descriptions

Pin number

Pin name

Type

D escription

1

G N D REF

PWR

G round pin for REF clocks.

2

X 1

IN

X TA L_IN 14.318M H z crystal input.

3

X 2

O UT

XTAL_OUT Crystal output.

4, 16

V D D PCI

PWR

3.3V olts pow er pin for PCICLK s.

5, 6, 7, 8, 17, 18,

19, 20

PCICLK (1:8)

O U T

PCI clock output at 3.3V . Synchronous to CPU clocks.

9, 24

G N D PCI

PWR

G round pin for PCI clocks.

10

G N D CPU B

PWR

G round pin for CPU B clocks.

11, 12, 13, 14

CPU B (1:4)

O U T

CPU CLK outputs up to 133.3M H z.

15

V D D CPU B

PWR

Pow er pin for the CPU bank B CLK s. 3.3V .

21, 22

FS (0:1)

IN

Logic - input for frequency selection.

23, 41

*O U T_SEL (0:1)

IN

These control the output functionality of the O U T and O U T/2 pins.

Refer to table for details.

24

G N D PCI

PWR

G nd pin for PCICLK s.

25

V D D A

PWR

Pow er for analog outputs.

26

*PCI_STO P#

IN

This active low input stops PCI clocks.

27, 28

N/C

-

Not connected

29

G N D D

PWR

D igitial ground

30

G N D A

PWR

A nalog ground

31

G N D O U T

PWR

G round for output pins.

32

OUT/2

O U T

H alf the O U T frequency. D ependent on O U T_SEL. Refer to table

for details.

33

OUT

O U T

This output frequency is dependent on O U T_SEL. Refer to table for

details.

34

V D D O U T

PWR

Pow er for O U T pins 3.3V .

35

V D D D

PWR

Pow er for digitial outputs.

36

CPU B_STO P#**

IN

This active low input stops the CPU B clocks at a logic "0" level

when input low .

45, 44, 38, 37

CPU A (1:4)

O U T

CPU CLK outputs up to 133.3M H z.

39

V D D CPU A

PWR

Pow er pin for the CPU bank A CLK s. 3.3V .

40

PD #

IN

This asynchronous input pow ers dow n the chip w hen drive

active(Low ). The internal PLLs are disabled and all the output clocks

are held at a Low state.

42

G N D CPU A

PWR

G round pin for CPU B clocks.

43

SS_EN

IN

Spread spectrum is turned on by driving this input high and turned

off by driving low .

46

V D D REF

PWR

Pow er pin for REF clocks.

47, 48

REF

O U T

14.318M H z reference clock outputs at 3.3V .