ICS950818

Pin Description (Continued)

PIN# PIN NAME

PIN TYPE

DESCRIPTION

25

SDATA

1/0

Data pin for I2C circuitry 5V tolerant

26

SCLK

IN

Clock pin of I2C circuitry 5V tolerant

27

GND

PWR

Ground pin.

28

VDD3V66

PWR

Power pin for the 3V66 clocks.

29

PCICLK10

OUT

PCI clock output.

30

PCI_STOP#

IN

Stops all PCICLKs besides the PCICLK_F clocks at logic 0 level,when input

low

31

3V66 1NCH CLK

OUT

3.3V 66.66MHz clock output/ 48MHz VCH clock output.

32

GND

PWR

Ground pin.

33

VDD48

PWR

Power pin for the 48MHz output.3.3V

34

48MHz DOT

OUT

48MHz clock output.

35

48MHz USB

OUT

48MHz clock output.

36

FS0

IN

Frequency select pin.

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

37

IREF

OUT

output pairs. This pin requires a fD<ed precision resistor tied to ground in

order to establish the appropriate current. 475 ohms is the standard value.

38

CPUCLKC1

OUT

Complimentary clock of differential pair CPU outputs. These are current

mode outputs. External resistors are required for voltaoe bias.

39

CPUCLKT1

OUT

True clock of differential pair CPU outputs. These are current mode

outputs. External resistors are required for voltaoe bias.

40

VDDCPU

PWR

Supply for CPU clocks,3.3V nominal

41

GND

PWR

Ground pin.

42

CPUCLKC0

OUT

Complimentary clock of differential pair CPU outputs. These are current

mode outputs. External resistors are required for voltaqe bias.

43

CPUCLKT0

OUT

True clock of differential pair CPU outputs. These are current mode

outputs. External resistors are required for voltage bias.

44

VDDCPU

PWR

Supply for CPU clocks,3.3V nominal

45

CPU STOP#

IN

Stops all CPUCLK besides the free running clocks

46

FS1

IN

Frequency select pin.

47

REF

OUT

14.318 MHz reference clock.

48

VDDREF

PWR

Ref,XTAL power supply,nominal 3.3V

Power Supply

Pin Number

VDD

GND

Description

48

3

Xtal,Ref

11

7

PCICLK outputs

15,28

16,27

3V66

22

23

Master clock,CPU Analog

33

32

48MHz,Fix Digital,Fix Analog

41

Inputs

40,44

41

CPUCLK clocks

0825F-11/19/03

3