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CY28378

FTG for Pentium 4

廬

and Intel

廬

845 Series Chipset

Features

鈥?C

ompatible with Intel

廬

CK-Titan and CK-408 Clock

鈥?/div>

Synthesizer/Driver specifications

System frequency synthesizer for Intel Brookdale 845

and Brookdale 鈥?G Pentium 4

廬

chipsets

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

Programmable 3V66 and PCI output frequency mode

鈥?Capable of generating system RESET after a Watchdog

timer time-out or a change in output frequency via

SMBus interface occurs

鈥?Support SMBus byte read/write and block read/ write

operations to simplify system BIOS development

鈥?Vendor ID and Revision ID support

鈥?Programmable drive strength support

鈥?Programmable output skew support

鈥?Power management control inputs

鈥?Available in 48-pin SSOP

Table 1. Frequency Table

CPU

x3

3V66

x4

PCI

x 10

REF

x2

48M

x1

24_48M

x1

Block Diagram

X1

X2

Pin Configuration

[1]

VDD_REF

REF0:1

XTAL

OSC

PLL 1

PLL Ref Freq

Divider

Network

VDD_CPU

*MULTSEL1/REF1

CPUT[0:1], CPUC[0:1],

VDD_REF

CPU_ITP, CPU_ITP#

*FS0:4

VTT_PWRGD#

*MULTSEL0:1

PLL2

Fract.

Aligner

VDD_3V66

3V66_0:2

VDD_PCI

PCI_F0:2

2

PCI0:6

VDD_48MHz

3V66_3/48MHz_1

VDD_48MHz

48MHz_0

PWRDWN#

24_48MHz

2

SDATA

SCLK

SMBus

Logic

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#

RESET#

GND_48MHz

*FS0/48MHz_0

*FS1/24_48MHz

VDD_48MHz

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

REF0/MULTSEL0**

GND_REF

VDD_CPU

CPU_ITP

CPU_ITP#

GND_CPU

PWRDWN#*

CPUT0

CPUC0

VDD_CPU

CPUT1

CPUC1

GNDC_CPU

IREF

VDD_CORE

GND_CORE

VDD_3V66

3V66_0

3V66_1

GND_3V66

3V66_2

3V66_3/48MHz_1

SCLK

SDATA

~

CY28378

RESET#

SSOP-48

Note:

1. Signals marked with 鈥?鈥?and 鈥?*鈥?have internal pull-up and pull-down resistors, respectively.

Cypress Semiconductor Corporation

Document #: 38-07519 Rev. **

鈥?/div>

3901 North First Street

鈥?/div>

San Jose

,

CA 95134

鈥?/div>

408-943-2600

Revised February 28,2003

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