ICS951601 datasheet(2/9 Pages) ICST

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ICS951601

Preliminary Product Preview

0663B—09/04/03

Pin Descriptions

Pin number

Pin name

Type

Description

REF0

OUT

Reference output

2, 13, 18, 21, 26,

33, 38, 46

VDD

PWR

3.3V Power supply

Crystal input,nominally 14.318MHz.

OUT

Crystal output, nominally 14.318MHz.

9, 44

VDDA

PWR

Analog 3.3V Power supply

10, 30, 36, 42

SELxx

Real time PCI output frequency selection pins

5, 14, 17, 22, 27,

32, 39, 47

GND

PWR

Ground pins

SDATA

I/O

Data pin for I

2C circuitry 5V tolerant

7SCLK

Clock input of I

2C input

8, 43

GNDA

PWR

Analog ground pins

24, 23, 20, 19,

16, 15, 12, 11,

PCI1A (7:0)

OUT

PCI clock outputs, selectable to be either

33.33 or 66.66MHz at 3.3V.

29, 28, 25

PCI1B (2:0)

OUT

PCI clock outputs, selectable to be either

33.33 or 66.66MHz at 3.3V.

35, 34, 31

PCI2A (2:0)

OUT

PCI clock outputs, selectable to be either

33.33 or 66.66MHz at 3.3V.

41, 40, 37

PCI2B (2:0)

OUT

PCI clock outputs, selectable to be either

33.33 or 66.66MHz at 3.3V.

SPREAD

Enables Spread Spectrum, default is on.

48MHz

OUT

Fixed 48MHz clock output for USB.

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