IDT® PC MAIN CLOCK - CK540

1247C—06/16/11

Advance Information

9UMS9001

PC MAIN CLOCK - CK540

3

Pin Description (continued)

PIN #

PIN NAME

TYPE

DESCRIPTION

29

CLKREQ0#

IN

Clock request input for SRC output pair 0. See the SRC, LCD, DOT Power Management Table for

details

30

SRC0C_LPRS

OUT

Complement side of low-power CK505-type SRC0 differential clock. Rs is integrated (No external

series resistor required).

31

SRC0T_LPRS

OUT

True side of low-power CK505-type SRC0 differential clock. Rs is integrated (No external series

resistor required).

32

SRC1C_LPRS

OUT

Complement side of low-power CK505-type SRC1 differential clock. Rs is integrated (No external

series resistor required).

33

SRC1T_LPRS

OUT

True side of low-power CK505-type SRC1 differential clock. Rs is integrated (No external series

resistor required).

34

GNDSRC

PWR Ground for SRC clocks

35

VDDIO_SRC

PWR Power supply for SRC outputs. VDD_IO = 1.05 to 3.3V +/-5%.

36

SRC2C_LPRS

OUT

Complement side of low-power CK505-type SRC2 differential clock. Rs is integrated (No external

series resistor required).

37

SRC2T_LPRS

OUT

True side of low-power CK505-type SRC2 differential clock. Rs is integrated (No external series

resistor required).

38

SRC3C_LPRS

OUT

Complement side of low-power CK505-type SRC3 differential clock. Rs is integrated (No external

series resistor required).

39

SRC3T_LPRS

OUT

True side of low-power CK505-type SRC3 differential clock. Rs is integrated (No external series

resistor required).

40

VDDCORE_3.3

PWR 3.3V Power supply for 3.3V core

41

CLKREQ3#

IN

Clock request input for SRC output pair 3. See the SRC, LCD, DOT Power Management Table for

details

42

CLKREQ2#

IN

Clock request input for SRC output pair 2. See the SRC, LCD, DOT Power Management Table for

details

43

FSLB

IN

Low threshold Frequency Select input. See Table 1: CPU Frequency Select Table and the Vih_fs and

Vil_fs specifications.

44

CPU_STOP#

IN

Stops all CPU clocks except those set to be free running.

45

CPUITPC_LPRS

OUT

Complement side of low-power CK505-type CPUITP differential clock. Rs is integrated (No external

series resistor required). Note that this pin is NOT muxed with an SRC output.

46

CPUITPT_LPRS

OUT

True side of low-power CK505-type CPUITP differential clock. Rs is integrated (No external series

resistor required).

47

CPU1C_LPRS

OUT

Complement side of low-power CK505-type CPU1 differential clock. Rs is integrated (No external

series resistor required). Note that this pin is NOT muxed with an SRC output.

48

CPU1T_LPRS

OUT

True side of low-power CK505-type CPU1 differential clock. Rs is integrated (No external series

resistor required).

49

VDDIO_CPU

PWR Power supply for CPU outputs. VDD_IO = 1.05 to 3.3V +/-5%.

50

GNDCPU

PWR Ground Pin for CPU Outputs

51

CPU0C_LPRS

OUT

Complement side of low-power CK505-type CPU1 differential clock. Rs is integrated (No external

series resistor required). Note that this pin is NOT muxed with an SRC output.

52

CPU0T_LPRS

OUT

True side of low-power CK505-type CPU1 differential clock. Rs is integrated (No external series

resistor required).

53

VDDCPUPLL_3.3

PWR 3.3V Power Supply for CPU PLL.

54

CK_PWRGD#/PD

IN

Notifies 9UMS9001 to sample latched inputs or enter power down mode.

1 = Power down mode

Falling Edge = Sample latched inputs

0 = Normal operation

55

FSLC

IN

Low threshold Frequency Select input. See Table 1: CPU Frequency Select Table and the Vih_fs and

Vil_fs specifications.

56

GNDREF

PWR Ground pin for crystal oscillator circuit and REF output