CY28378OC datasheet(4/21 Pages) SILABS

Part #	CY28378OC

Description	FTG for Pentium 4 and Intel 845 Series Chipset

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Manufacturer	SILABS [Silicon Laboratories]

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CY28378

........................ Document #: 38-07519 Rev. ** Page 4 of 21

Serial Data Interface

To enhance the flexibility and function of the clock synthesizer,

a two-signal serial interface is provided. Through the Serial

Data Interface (SDI), various device functions such as

individual clock output buffers, etc. can be individually enabled

or disabled.

Table 2. Frequency Selection Table

Input Conditions

Output Frequency

VCO

Freq.

PLL Gear

Constants

(G)

FS4

FS3

FS2

FS1

FS0

CPU

3V66

PCI

SEL4

SEL3

SEL2

SEL1

SEL0

0

100.7

67.1

33.6

402.80

47.99750

0

1

100.9

67.3

33.6

403.60

47.99750

0

1

0

108.0

72.0

36.0

432.00

47.99750

0

1

101.2

67.5

33.7

404.80

47.99750

0

1

0

114.0

76.0

38.0

456.00

47.99750

0

1

0

1

117.0

78.0

39.0

468.00

47.99750

0

1

0

120.0

80.0

40.0

480.00

47.99750

0

1

123.0

82.0

41.0

492.00

47.99750

0

1

0

125.7

62.9

31.4

377.12

63.99667

0

1

0

1

130.3

65.1

32.6

390.80

63.99667

0

1

0

1

0

133.9

67.0

33.5

401.70

63.99667

0

1

0

1

134.2

67.1

33.6

402.60

63.99667

0

1

0

134.5

67.3

33.6

403.50

63.99667

0

1

0

1

148.0

74.0

37.0

444.00

63.99667

0

1

0

152.0

76.0

38.0

456.00

63.99667

0

1

156.0

78.0

39.0

468.00

63.99667

1

0

160.0

80.0

40.0

480.00

63.99667

1

0

1

164.0

82.0

41.0

492.00

63.99667

1

0

1

0

167.4

66.9

33.5

334.80

95.99500

1

0

1

170.0

68.0

34.0

340.00

95.99500

1

0

1

0

175.0

70.0

35.0

350.00

95.99500

1

0

1

0

1

180.0

72.0

36.0

360.00

95.99500

1

0

1

0

185.0

74.0

37.0

370.00

95.99500

1

0

1

190.0

76.0

38.0

380.00

95.99500

1

0

166.8

66.7

33.4

333.60

95.99500

1

0

1

100.2

66.8

33.4

400.80

47.99750

1

0

1

0

133.6

66.8

33.4

400.80

63.99667

1

0

1

200.4

66.8

33.4

400.80

95.99500

1

0

166.6

66.6

33.3

333.33

95.99500

1

0

1

100.0

66.6

33.3

400.00

47.99750

1

0

200.0

66.6

33.3

400.00

95.99500

1

133.3

66.6

33.3

400.00

63.99667

Swing Select Functions

MULTSEL1

MULTSEL0

Board Target

Trace/Term Z

Reference R, IREF =

VDD/(3*Rr)

Output

Current

VOH @ Z

00

50



Rr = 221 1%,

IREF = 5.00 mA

IOH = 4*Iref

1.0V @ 50

10

50



Rr = 475 1%,

IREF = 2.32 mA

IOH = 6*Iref

0.7V @ 50

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