2

ICS932S801

0959C—03/13/06

Pin Descriptions

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

1X1

IN

Crystal input, Nominally 14.318MHz.

2

X2

OUT

Crystal output, Nominally 14.318MHz

3

VDD48

PWR

Power pin for the 48MHz output.3.3V

4

48MHz_0

OUT

48MHz clock output.

5

48MHz_1

OUT

48MHz clock output.

6

GND

PWR

Ground pin.

7

SCLK

I/O

Clock pin of SMBus circuitry, 5V tolerant.

8

SDATA

I/O

Data pin for SMBus circuitry, 5V tolerant.

9

VDDHTT

PWR

Supply for HTT clocks, nominal 3.3V.

10

HTTCLK0

OUT

3.3V Hyper Transport output

11

HTTCLK1

OUT

3.3V Hyper Transport output

12

HTTCLK2

OUT

3.3V Hyper Transport output

13

HTTCLK3

OUT

3.3V Hyper Transport output

14

GNDHTT

PWR

Ground pin for the HTT outputs

15

VDDPCI

PWR

Power supply for PCI clocks, nominal 3.3V

16

PCICLK0

OUT

PCI clock output.

17

PCICLK1

OUT

PCI clock output.

18

PCICLK2

OUT

PCI clock output.

19

PCICLK3

OUT

PCI clock output.

20

GNDPCI

PWR

Ground pin for the PCI outputs

21

PD#

IN

Asynchronous active low input pin used to power down the device. The internal

clocks are disabled and the VCO and the crystal are stopped.

22

VDDA

PWR

3.3V power for the PLL core.

23

GNDA

OUT

Ground pin for the PLL core.

24

IREF

OUT

This pin establishes the reference current for the differential current-mode output

pairs. This pin requires a fixed precision resistor tied to ground in order to establish

the appropriate current. 475 ohms is the standard value.

25

SRCCLKC0

OUT

Complement clock of differential SRC clock pair.

26

SRCCLKT0

OUT

True clock of differential SRC clock pair.

27

VDDSRC

PWR

Supply for SRC clocks, 3.3V nominal

28

GNDSRC

PWR

Ground pin for the SRC outputs

29

SPREAD_EN

IN

Asynchronous, active high input to enable spread spectrum functionality.

30

CPUCLK8C3

OUT

Complementary clock of differential 3.3V push-pull K8 pair.

31

CPUCLK8T3

OUT

True clock of differential 3.3V push-pull K8 pair.

32

GNDCPU

PWR

Ground pin for the CPU outputs

33

VDDCPU

PWR

Supply for CPU clocks, 3.3V nominal

34

CPUCLK8C2

OUT

Complementary clock of differential 3.3V push-pull K8 pair.

35

CPUCLK8T2

OUT

True clock of differential 3.3V push-pull K8 pair.

36

GNDCPU

PWR

Ground pin for the CPU outputs

37

VDDCPU

PWR

Supply for CPU clocks, 3.3V nominal

38

CPUCLK8C1

OUT

Complementary clock of differential 3.3V push-pull K8 pair.

39

CPUCLK8T1

OUT

True clock of differential 3.3V push-pull K8 pair.

40

GNDCPU

PWR

Ground pin for the CPU outputs

41

VDDCPU

PWR

Supply for CPU clocks, 3.3V nominal

42

CPUCLK8C0

OUT

Complementary clock of differential 3.3V push-pull K8 pair.

43

CPUCLK8T0

OUT

True clock of differential 3.3V push-pull K8 pair.

44

GND

PWR

Ground pin.

45

FS2

IN

Frequency select pin.

46

FS1/REF1

I/O

Frequency select latch input pin / 14.318 MHz reference clock.

47

FS0/REF0

I/O

Frequency select latch input pin / 14.318 MHz reference clock.

48

VDDREF

PWR

Ref, XTAL power supply, nominal 3.3V