CY28RS400ZCT datasheet(1/18 Pages) SPECTRALINEAR

Part #	CY28RS400ZCT

Description	Clock Generator for ATI RS400 Chipset

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Manufacturer	SPECTRALINEAR [SpectraLinear Inc]

Direct Link	http://www.spectralinear.com

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1 / 18 page

Clock Generator for ATI

RS400 Chipset

CY28RS400

Rev 1.0, November 22, 2006

Page 1 of 18

2200 Laurelwood Road, Santa Clara, CA 95054

Tel:(408) 855-0555

Fax:(408) 855-0550

www.SpectraLinear.com

Features

• Supports Intel CPU

• Selectable CPU frequencies

• Differential CPU clock pairs

• 100 MHz differential SRC clocks

• 48 MHz USB clock

• 33 MHz PCI clock

• Low-voltage frequency select input

•I2C support with readback capabilities

• Ideal Lexmark Spread Spectrum profile for maximum

electromagnetic interference (EMI) reduction

• 3.3V power supply

• 56-pin SSOP and TSSOP packages

CPU

SRC

PCI

REF

USB_48

x3

x8

x1

x 3

x 1

Block Diagram

Pin Configuration

Xin

XOUT

USB_48

VSS_48

VTT_PWRGD#/PD

SCLK

SDATA

FSC

CLKREQ#0

CLKREQ#1

SRCT5

SRCC5

VDD_SRC

VSS_SRC

SRCT4

SRCC4

SRCT3

SRCC3

VSS_SRC

VDD_SRC

SRCT2

SRCC2

SRCT1

SRCC1

VDD_REF

VSS_REF

SRCST0

VSS_SRC1

VSSA

IREF

VDDA

CPUT2

CPUC2

CPUC1

VSS_CPU

CPUT1

VDD_CPU

CPUT0

CPUC0

CPU_STOP#

PCI0/409_410

VDD_PCI

REF1/FSB

REF2

REF0/FSA

VDD_SRC1

VSS_SRC

SRCST1

SRCSC1

SRCT0

SRCC0

VSS_SRCS

SRCSC0

56

55

54

53

52

51

50

49

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

25

26

27

28

32

31

30

29

VDD_REF

XTAL

PLL Ref Freq

XOUT

XIN

OSC

SCLK

PLL1

I2C

Logic

VDD_48 MHz

SDATA

VDD_PCI

Divider

Network

VDD_CPU

FS_[C:A]

REF[0:2]

VTT_PWRGD#

IREF

PCI

PLL2

CPUT[0:2], CPUC[0:2],

VDD_SRC

SRCT[0:5],SRCC[0:5]

USB_48

CPU_STP#

CLKREQ[0:1]#

VDD_48

VDD_SRCS

VSS_PCI

56 SSOP/TSSOP

PD

VDD_SRCS

SRCST[0:1],SRCSC[0:1]

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