6

Integrated

Circuit

Systems, Inc.

ICS9LPRS480

1391D—02/02/09

TSSOP Pin Description (Continued)

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

33

VDDATIG

PWR

Power supply for ATIG core, nominal 3.3V

34

ATIG1C_LPRS

OUT

Complementary clock of low-power differential push-pull PCI-Express pair with integrated series

resistor. (no 50ohm shunt resistor to GND and no 33 ohm series resistor needed)

35

ATIG1T_LPRS

OUT

True clock of low-power differential push-pull PCI-Express pair with integrated series resistor. (no

50ohm shunt resistor to GND and no 33 ohm series resistor needed)

36

ATIG0C_LPRS

OUT

Complementary clock of low-power differential push-pull PCI-Express pair with integrated series

resistor. (no 50ohm shunt resistor to GND and no 33 ohm series resistor needed)

37

ATIG0T_LPRS

OUT

True clock of low-power differential push-pull PCI-Express pair with integrated series resistor. (no

50ohm shunt resistor to GND and no 33 ohm series resistor needed)

38

SB_SRC1C_LPRS

OUT

Complement clock of low power differential Chipset-to-Chipset SRC clock pair. (no 50ohm shunt resistor

to GND and no 33 ohm series resistor needed

39

SB_SRC1T_LPRS

OUT

True clock of low power differential Chipset-to-Chipset SRC clock pair. (no 50ohm shunt resistor to GND

and no 33 ohm series resistor needed

40

GNDSB_SRC

GND

Ground pin for the SB_SRC outputs

41

VDDSB_SRC_IO

PWR

Power supply for differential SB_SRC outputs, nominal 1.05V to 3.3V

42

VDDSB_SRC

PWR

Supply for SB SRC PLL core, 3.3V nominal

43

SB_SRC0C_LPRS

OUT

Complement clock of low power differential Chipset-to-Chipset SRC clock pair. (no 50ohm shunt resistor

to GND and no 33 ohm series resistor needed

44

SB_SRC0T_LPRS

OUT

True clock of low power differential Chipset-to-Chipset SRC clock pair. (no 50ohm shunt resistor to GND

and no 33 ohm series resistor needed

45

CLKREQ4#*

IN

Clock Request pin for SRC4 outputs. If output is selected for control, then that output is controlled as

follows:

0 = enabled, 1 = Low-Low

46

CLKREQ3#*

IN

Clock Request pin for SRC3 outputs. If output is selected for control, then that output is controlled as

follows:

0 = enabled, 1 = Low-Low

47

VDDSATA

PWR

Power supply for SATA core logic, nominal 3.3V

48

SRC6C/SATAC_LPRS

OUT

Complement clock of low power differential SRC/SATA clock pair. (no 50ohm shunt resistor to GND and

no 33 ohm series resistor needed)

49

SRC6T/SATAT_LPRS

OUT

True clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND and no 33 ohm

series resistor needed)

50

GNDSATA

GND

Ground pin for the SRC outputs

51

CLKREQ2#*

IN

Clock Request pin for SRC2 outputs. If output is selected for control, then that output is controlled as

follows:

0 = enabled, 1 = Low-Low

52

CLKREQ1#*

IN

Clock Request pin for SRC1 outputs. If output is selected for control, then that output is controlled as

follows:

0 = enabled, 1 = Low-Low

53

GNDCPU

GND

Ground pin for the CPU outputs

54

VDDCPU_IO

PWR

Power supply for differential CPU outputs, nominal 1.05V to 3.3V

55

VDDCPU

PWR

Supply for CPU core, 3.3V nominal

56

CPUKG0C_LPRS

OUT

Complementary signal of low-power differential push-pull AMD K8 "Greyhound" clock with integrated

series resistor. (no 33 ohm series resistor needed)

57

CPUKG0T_LPRS

OUT

True signal of low-power differential push-pull AMD K8 "Greyhound" clock with integrated series

resistor.(no 33 ohm series resistor needed)

58

PD#

IN

Enter /Exit Power Down.

0 = Power Down, 1 = normal operation.

59

GNDHTT

PWR

Ground pin for the HTT outputs

60

HTT0C_LPRS/66M

OUT

Complementary signal of low-power differential push-pull hypertransport clock with integrated series

resistor. (no 50ohm shunt resistor to GND and no 33 ohm series resistor needed) / 1.8V single ended

66MHz hyper transport clock

61

HTT0T_LPRS/66M

OUT

True signal of low-power differential push-pull hypertransport clock with integrated series resistor. (no

50ohm shunt resistor to GND and no 33 ohm series resistor needed) /1.8V single ended 66MHz hyper

transport clock

62

VDDHTT

PWR

Supply for HTT clocks, nominal 3.3V.

63

VDDREF

PWR

Ref, XTAL power supply, nominal 3.3V

64

REF2/SEL_27

I/O

14.318 MHz reference clock, 3.3V/3.3V Latched input to select 27MHz SS and non SS on SRC7

0 = 100MHz differential spreading SRC clock, 1 = 27MHz non-spreading singled clock on pin 12 and

27MHz spread clock on pin 13.