CY28323PVC

Rev 1.0, November 24, 2006

Page 1 of 21

2200 Laurelwood Road, Santa Clara, CA 95054

Tel:(408) 855-0555

Fax:(408) 855-0550

www.SpectraLinear.com

Features

sizer/Driver Specifications

• System frequency synthesizer for Intel Brookdale 845

• Programmable clock output frequency with less than

1 MHz increment

• Integrated fail-safe Watchdog timer for system

recovery

• Automatically switch to HW selected or SW

programmed clock frequency when watchdog timer

time-out

• Capable of generating system RESET after a Watchdog

timer time-out occurs or a change in output frequency

via SMBus interface

• Support SMBus byte read/write and block read/ write

operations to simplify system BIOS development

• Vendor ID and Revision ID support

• Programmable drive strength support

• Programmable output skew support

• Power management control inputs

• Available in 48-pin SSOP

CPU

3V66

PCI

REF

48M

24_48M

x 3

x 4

x 10

x 2

x 1

x 1

Note:

1. Signals marked with ‘*’ and “^” has internal pull-up and pull-down resistors respectively.

Block Diagram

Pin Configuration

VDD_REF

CPU0:1, CPU0:1#,

XTAL

PLL Ref Freq

X2

X1

VDD_PCI

OSC

SCLK

PLL 1

SMBus

Logic

VDD_48MHz

SDATA

VDD_3V66

Divider

Network

VDD_CPU

PLL2

*FS0:4

2

PWR_DWN#

SSOP-48

REF0:1

VTT_PWRGD#

*MULTSEL1/REF1

VDD_REF

X1

X2

GND_PCI

*FS2/PCI_F0

*FS3/PCI_F1

PCI_F2

VDD_PCI

*FS4/PCI0

PCI1

PCI2

GND_PCI

PCI3

PCI4

PCI5

PCI6

VDD_PCI

VTT_PWRGD#

RST#

GND_48MHz

*FS0/48MHz

*FS1/24_48MHz

VDD_48MHz

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

28

27

26

25

32

31

30

29

REF0/MULTSEL0*

GND_REF

VDD_CPU

CPU_ITP

CPU_ITP#

GND_CPU

PWR_DWN#

CPU0

CPU0#

VDD_CPU

CPU1

CPU1#

GND_CPU

IREF

VDD_CORE

GND_CORE

VDD_3V66

3V66_0

3V66_1

GND_3V66

3V66_2

3V66_3

SCLK

SDATA

*MULTSEL0:1

3V66_0:3

PCI_F0:2

PCI0:6

48MHz

24_48MHz

RST#

CPU_ITP, CPU_ITP#

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