2

Integrated

Circuit

Systems, Inc.

ICS9LPRS545

Datasheet

1479A—07/28/09

SSOP/TSSOP Pin Description

PIN #

PIN NAME

TYPE

DESCRIPTION

1

PCI0/CR#_A

I/O

3.3V PCI clock output or CR#_A input. Default is PCI0. To configure this pin as CR#_A, the PCI output must first be

disabled in Byte 2, bit 0.

Byte 5, bit 7: 0 = PCI0 enabled (default), 1= CR#_A enabled.

Byte 5, bit 6: 0 = CR#_A controls SRC0 (default), 1= CR#_A# controls SRC2.

2

VDDPCI

PWR Power supply for PCI clocks, nominal 3.3V

3

PCI4/SRC5_EN

I/O

3.3V PCI clock output / SRC5 enable strap. On powerup, the logic value on this pin determines if SRC5 or

CPU_STOP#/PCI_STOP# is enabled. The latched value controls the pin function as follows

0 = PCI_STOP#/CPU_STOP#

1 = SRC5/SRC5#

4

PCI_F5/ITP_EN

I/O

Free running PCI clock output and ITP/SRC8 enable strap. This output is not affected by the state of the PCI_STOP# pin.

On powerup, the state of this pin determines whether pins 38 and 39 are an ITP or SRC pair.

0 =SRC8/SRC8#

1 = ITP/ITP#

5

GNDPCI

PWR Ground pin for the PCI outputs

6

VDD48

PWR Power pin for the 48MHz output.3.3V

7

USB_48MHz/FSLA

I/O

3.3V tolerant input for CPU frequency selection. Refer to input electrical characteristics for Vil_FS and Vih_FS values. /

Fixed 48MHz USB clock output. 3.3V.

8

GND48

PWR Ground pin for the 48MHz outputs

9

VDD96_IO

PWR Power pin for the DOT96 clocks, nominal 1.05V to 3.3V.

10

DOT96T_LPR/SRCT0_LPR

OUT

True clock of push-pull SRC or DOT96 with integrated series resistor. No 50 ohm pull down needed. Default is SRCT0.

After powerup, this pin function may be changed to DOT96T via SMBus Byte 1, bit 7 as follows:

0= SRC0T

1=DOT96T

11

DOT96C_LPR/SRCC0_LPR

OUT

Complementary clock of push-pull SRC or DOT96 with integrated series resistor. No 50 ohm pull down needed. Default is

SRC0C. After powerup, this pin function may be changed to DOT96C via SMBus Byte 1, bit 7 as follows:

0= SRC0C

1=DOT96C

12

GND

PWR Ground pin.

13

VDD

PWR Power supply, nominal 3.3V

14

SE1

OUT CK505 Singled Ended Output 1. 3.3V.

15

GND

PWR Ground pin.

16

SRCT2_LPR/SATAT_LPR

OUT

True clock of differential 0.8V push-pull SRC/SATA output with integrated 33ohm series resistor. No 50ohm resistor to

GND needed.

17

SRCC2_LPR/SATAC_LPR

OUT

Complementary clock of differential 0.8V push-pull SRC/SATA output with integrated 33ohm series resistor. No 50ohm

resistor to GND needed.

18

GNDSRC

PWR Ground pin for the SRC outputs

19

SRCT3_LPR/CR#_C

I/O

True clock of push-pull SRC output with int. 33ohm series resistor/CR#_C input. Disable SRC3 via Byte 4, bit 7, before

using as CR#_C.

Byte 5, bit 3: 0=SRC3 (default), 1=CR#_C.

Byte 5, bit 2: 0=CR#_C controls SRC0 (default), 1=CR#_C controls SRC2

20

SRCC3_LPR/CR#_D

I/O

Complementary clock of push-pull SRC output with int. 33ohm series resistor/CR#_D input. Disable SRC3 via Byte 4, bit

7, before using as CR#_D.

Byte 5, bit 1: 0=SRC3 (default),1=CR#_D.

Byte 5, bit 0: 0=CR#_D controls N/A (default), 1=CR#_D controls SRC4

21

VDDSRC_IO

PWR 1.05V to 3.3V from external power supply

22

SRCT4_LPR

OUT True clock of push-pull SRC output with int. 33ohm series resistor.

23

SRCC4_LPR

OUT Complementary clock of push-pull SRC output with int. 33ohm series resistor.

24

CPU_STOP#/SRCC5_LPR

I/O

Stops all CPUCLK, except those set to be free running clocks /

Complementary clock of push-pull SRC pair with int. 33ohm series resistor.