IDT® PC MAIN CLOCK

1520D—01/06/11

ICS9LRS4103

PC MAIN CLOCK

2

Pin Description

Pin#

Pin Name

Type Pin Description

1

X1

IN

Crystal input, Nominally 14.318MHzMHz.

2

X2

OUT

Crystal output, Nominally 14.318MHzMHz.

3

SMBCLK_3.3

IN

Clock pin of SMBus circuitry, 3.3V tolerant.

4

SMBDAT_3.3

I/O

Data pin for SMBus circuitry, 3.3V tolerant.

5

VDD96

PWR Power pin for the DOT96MHz output 3.3V.

6DOT96T

OUT

True clock DOT96 output with integrated 33ohm series resistor. No 50ohm

resistor to GND needed.

7DOT96C

OUT

Complementary clock DOT96 output with integrated 33ohm series resistor. No

50ohm resistor to GND needed.

8

GND96

PWR Ground pin for the DOT96MHz output.

9

GNDSSC

PWR Ground pin for the CK_SSC_DISP output.

10

CK_SSC_DISP_T

OUT

True clock of CK_SSC_DISP (100MHz or 120MHz) output with integrated 33ohm

series resistor. No 50ohm resistor to GND needed.

11

CK_SSC_DISP_C

OUT

Complementary clock of CK_SSC_DISP (100MHz or 120MHz) output with

integrated 33ohm series resistor. No 50ohm resistor to GND needed.

12

VDDSSC

PWR Power pin for the CK_SSC_DISP output 3.3V

13

VDDSATA

PWR Power pin for the SATA output 3.3V

14

SRC1T/SATA_NS_T

OUT

True clock of differential 0.8V push-pull SRC/SATA output with integrated 33ohm

series resistor. No 50ohm resistor to GND needed.

15

SRC1C/SATA_NS_C

OUT

Complementary clock of differential 0.8V push-pull SRC/SATA output with

integrated 33ohm series resistor. No 50ohm resistor to GND needed.

16

GNDSATA

PWR Ground pin for the SATA output.

17

GNDSRC

PWR Ground pin for the SRC output.

18

SRC2T

OUT

True clock of differential 0.8V push-pull SRC output with integrated 33ohm series

resistor. No 50ohm resistor to GND needed.

19

SRC2C

OUT

Complementary clock of differential 0.8V push-pull SRC output with integrated

33ohm series resistor. No 50ohm resistor to GND needed.

20

VDDSRC

PWR Power pin for the SRC output 3.3V.

21

SEL_120M#

IN

Selects pins #10/11 to be 120MHz or 100MHz. "0" = 120MHz, "1" = 100MHz.

22

GNDCPU

PWR Ground pin for the CPU output.

23

CPUT0

OUT

True clock of differential pair 0.8V push-pull CPU outputs with integrated 33ohm

series resistor. No 50 ohm resistor to GND needed.

24

CPUC0

OUT

Complementary clock of differential pair 0.8V push-pull CPU outputs with

integrated 33ohm series resistor. No 50 ohm resistor to GND needed.

25

VDDCPU

PWR Power pin for the CPU output 3.3V

26

CKPWRGD/PD#_3.3

IN

Notifies CK505 to sample latched inputs, or iAMT entry/exit, or PWRDWN# mode

27

VDDREF14M

PWR Power pin for the REF output 3.3V

28

REF14.318M_2X/FSLC**

I/O

Reference 14.318 MHz clock, which drives 3 loads on default / 3.3V tolerant input

for CPU frequency selection. Refer to input electrical characteristics for Vil_FS

and Vih_FS values.

29

GNDREF

PWR Ground pin for the REF output.

30

VDDXTAL

PWR Power pin for XTAL 3.3V

31

SEL_SATA_NS#

IN

Selects pin #14/15 to be SRC1 or SATA_NS. "0" = SATA_NS, "1" = SRC1

32

GNDXTAL

PWR Ground pin for XTAL.