ics9248-146 Integrated Device Technology, ics9248-146 Datasheet

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ics9248-146

Manufacturer Part Number

ics9248-146

Description

Single Chip Clock Solution For Sis630s Chipsets.

Manufacturer

Integrated Device Technology

Datasheet

1.ICS9248-146.pdf (16 pages)

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Download datasheet (168Kb)

Frequency Generator & Integrated Buffers for Celeron & PII/III™

Recommended Application:

Single chip clock solution for SIS630S chipsets.

Output Features:

•

•

•

•

•

•

•

Features:

•

•

•

•

•

Skew Specifications:

•

•

•

•

Block Diagram

0350B—02/02/04

SDRAM_STOP#

CPU_STOP#

PCI_STOP#

3- CPUs @ 2.5V

13 - SDRAM @ 3.3V

6- PCI @3.3V,

2 - AGP @ 3.3V

1- 48MHz, @3.3V fixed.

1- 24/48MHz, @3.3V selectable by I

(Default is 24MHz)

2- REF @3.3V, 14.318MHz.

Up to 166MHz frequency support

Support FS0-FS3 trapping status bit for I

back.

Support power management: CPU, PCI, SDRAM

stops and Power down Mode form I

Spread spectrum for EMI control (0 to -0.5%, ±

0.25%).

Uses external 14.318MHz crystal

CPU - CPU: < 175ps

SDRAM - SDRAM < 250ps (except SDRAM12)

PCI - PCI: < 500ps

CPU (early) - PCI: 1-4ns (typ. 2ns)

AGP_SEL

FS(3:0)

SDATA

MODE

SCLK

PD#

X2

X1

Integrated

Circuit

Systems, Inc.

XTAL

OSC

Spectrum

PLL2

Spread

Control

Config.

PLL1

Logic

Reg.

DIVDER

SDRAM

DIVDER

DIVDER

DIVDER

CPU

AGP

PCI

/ 2

2

C programming.

2

Stop

Stop

Stop

C

2

C read

13

5

2

3

2

48MHz

24_48MHz

SDRAM (12:0)

PCICLK (4:0)

PCICLK_F

AGP (1:0)

CPUCLK (2:0)

REF(1:0)

*(MODE)24_48MHz

1

*(FS1)PCICLK_F

*

Functionality

(AGPSEL)REF0

*(FS2)PCICLK0

* These inputs have a 120K pull down to GND.

FS3 FS2 FS1 FS0

1

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

*(FS0)48MHz

1

*(FS3)REF1

These are double strength.

AGPCLK0

AGPCLK1

PCICLK1

PCICLK2

PCICLK3

PCICLK4

VDDAGP

VDDPCI

0

0

0

0

1

1

1

1

0

0

0

0

1

1

1

1

VDD48

SDATA

VDDA

SCLK

GND

GND

GND

GND

X1

X2

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

Pin Configuration

48-Pin 300mil SSOP

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

1

2

3

4

5

6

7

8

9

100.00

166.67

133.33

100.00

100.00

133.33

112.00

124.00

138.00

150.00

100.00

150.00

160.00

66.67

66.67

66.67

CPU

SDRAM PCICLK

100.00

166.67

133.33

100.00

133.33

100.00

112.00

124.00

138.00

150.00

133.33

150.00

100.00

120.00

66.67

66.67

ICS9248-146

33.33

33.33

33.33

33.33

33.33

33.33

33.33

33.33

33.60

31.00

34.50

30.00

33.33

30.00

30.00

30.00

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

AGP SEL

VDDL

CPUCLK0

CPUCLK1

CPUCLK2

GND

VDDSDR

SDRAM0

SDRAM1

SDRAM2

GND

SDRAM3

SDRAM4

SDRAM5

VDDSDR

SDRAM6

SDRAM7

GND

SDRAM8/PD#

SDRAM9/SDRAM_STOP#

GND

SDRAM10/PCI_STOP#

SDRAM11/CPU_STOP#

SDRAM12

VDDSDR

66.67

66.67

66.66

66.67

66.67

66.67

66.67

66.67

67.20

62.00

69.00

60.00

66.67

60.00

60.00

60.00

= 0

AGP SEL

50.00

50.00

55.56

50.00

50.00

50.00

50.00

50.00

56.00

46.50

51.75

50.00

50.00

50.00

50.00

48.00

= 1

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