3

Integrated

Circuit

Systems, Inc.

ICS952624

0768B—08/06/03

Pin Description (Continued)

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

25

3V66_3/VCH

OUT

3.3V 66.66MHz clock output

VCH: 48MHz VCH clock output

26

3V66_2

OUT

3.3V 66.66MHz clock output

27

VDD3V66

PWR

Power pin for the 3V66 clocks.

28

GND

PWR

Ground pin.

29

3V66_1

OUT

3.3V 66.66MHz clock output

30

3V66_0

OUT

3.3V 66.66MHz clock output

31

SCLK

IN

Clock pin of I2C circuitry 5V tolerant

32

SDATA

I/O

Data pin for I2C circuitry 5V tolerant

33

VttPWR_GD#

IN

This 3.3V LVTTL input is a level sensitive strobe used to determine when latch inputs

are valid and are ready to be sampled. This is an active low input.

34

VDD

OUT

Power supply, nominal 3.3V

35

SRCCLKC

OUT

Complementary clock of differential pair for S-ATA support.

+/- 300ppm accuracy required.

36

SRCCLKT

OUT

True clock of differential pair for S-ATA support.

+/- 300ppm accuracy required.

37

GND

PWR

Ground pin.

38

CPUCLKC0

OUT

"Complimentary" clocks of differential pair CPU outputs. These are current mode

outputs. External resistors are required for voltage bias.

39

CPUCLKT0

OUT

"True" clocks of differential pair CPU outputs. These are current mode outputs.

External resistors are required for voltage bias.

40

VDDCPU

PWR

Supply for CPU clocks, 3.3V nominal

41

CPUCLKC1

OUT

"Complimentary" clocks of differential pair CPU outputs. These are current mode

outputs. External resistors are required for voltage bias.

42

CPUCLKT1

OUT

"True" clocks of differential pair CPU outputs. These are current mode outputs.

External resistors are required for voltage bias.

43

GND

PWR

Ground pin.

44

CPUCLKC_ITP

OUT

"Complementary" clocks of differential pair CPU outputs for ITP.. These are current

mode outputs. External resistors are required for voltage bias.

45

CPUCLKT_ITP

OUT

"True" clocks of differential pair CPU outputs for ITP. These are current mode

outputs. External resistors are required for voltage bias.

46

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.

47

GND

PWR

Ground pin.

48

VDDA

PWR

3.3V power for the PLL core.