ICS9LPRS462

Low Power Clock for ATI RS/RD600 series chipsets for AMD CPUs

IDTTM/ICSTM

Low Power Clock for ATI RS/RD600 series chipsets for AMD CPUs

1378A—04/07/08

2

Pin Description

PIN #

PIN NAME

TYPE

DESCRIPTION

1

GNDREF

GND

Ground pin for the REF outputs.

2

VDDREF

PWR

Ref, XTAL power supply, nominal 3.3V

3

X1

IN

Crystal input, nominally 14.318MHz

4

X2

OUT

Crystal output, nominally 14.318MHz

5

VDD48

PWR

Power pin for the 48MHz outputs and core. 3.3V

6

48MHz_0

OUT

48MHz clock output.

7

48MHz_1

OUT

48MHz clock output.

8

GND48

GND

Ground pin for the 48MHz outputs

9

SMBCLK

IN

Clock pin of SMBus circuitry, 5V tolerant.

10

SMBDAT

I/O

Data pin for SMBus circuitry, 5V tolerant.

11

RESET_IN#

IN

Real Time falling edge triggered input, When asserted, the part initiates a power up

reset with the SMBus being reset to it's power up values, and all PLL derived clocks

stopped for the duration of Power up Stabilization. REF outputs continue to run.

12

SRC7T_LPR

OUT

True clock of low power differential SRC clock pair with integrated 33 ohm series

resistor. (no 50ohm shunt resistor to GND needed)

13

SRC7C_LPR

OUT

Complement clock of low power differential SRC clock pair with integrated 33 ohm

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

14

VDDSRC

PWR

Supply for SRC, 3.3V nominal

15

GNDSRC

GND

Ground pin for the SRC outputs

16

SRC6T_LPR

OUT

True clock of low power differential SRC clock pair with integrated 33 ohm series

resistor. (no 50ohm shunt resistor to GND needed)

17

SRC6C_LPR

OUT

Complement clock of low power differential SRC clock pair with integrated 33 ohm

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

18

SRC5T_LPR

OUT

True clock of low power differential SRC clock pair with integrated 33 ohm series

resistor. (no 50ohm shunt resistor to GND needed)

19

SRC5C_LPR

OUT

Complement clock of low power differential SRC clock pair with integrated 33 ohm

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

20

SRC4T_LPR

OUT

True clock of low power differential SRC clock pair with integrated 33 ohm series

resistor. (no 50ohm shunt resistor to GND needed)

21

SRC4C_LPR

OUT

Complement clock of low power differential SRC clock pair with integrated 33 ohm

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

22

GNDSRC

GND

Ground pin for the SRC outputs

23

VDDSRC

PWR

Supply for SRC, 3.3V nominal

24

SRC3T_LPR

OUT

True clock of low power differential SRC clock pair with integrated 33 ohm series

resistor. (no 50ohm shunt resistor to GND needed)

25

SRC3C_LPR

OUT

Complement clock of low power differential SRC clock pair with integrated 33 ohm

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

26

SRC2T_LPR

OUT

True clock of low power differential SRC clock pair with integrated 33 ohm series

resistor. (no 50ohm shunt resistor to GND needed)

27

SRC2C_LPR

OUT

Complement clock of low power differential SRC clock pair with integrated 33 ohm

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

28

VDDSRC

PWR

Supply for SRC, 3.3V nominal

29

GNDSRC

GND

Ground pin for the SRC outputs

30

ATIG3T_LPR

OUT

True clock of low-power differential push-pull PCI-Express pair with integrated 33 ohm

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

31

ATIG3C_LPR

OUT

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

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

32

*CLKREQB#

IN

Programmable Clock Request pin for SRC/ATIG/SB_SRC outputs. If output is selected

for control, then that output is controlled as follows:

0 = Enabled, 1 = Tri-state