W83194R-630A datasheet(6/15 Pages) WINBOND

Part #	W83194R-630A

Description	166MHZ CLOCK FOR SIS CHIPSET

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Manufacturer	WINBOND [Winbond]

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W83194R-630/-630A

- 6 -

5.3

I2C Control Interface

SYMBOL

I/O

FUNCTION

*SDATA

23

I/O

Serial data of I

2C 2-wire control interface

*SDCLK

24

IN

Serial clock of I

2C 2-wire control interface

5.4 Fixed Frequency Outputs

SYMBOL

I/O

FUNCTION

REF0X2 / *FS3

2

I/O

3.3V, 14.318MHz reference clock output .

Internal 250k

Ω pull-up.

Latched input for FS3 at initial power up for H/W

selecting the output frequency of CPU, SDRAM and

PCI clocks.

REF1

48

I/O

3.3V , 14.318MHz reference clock output.

24_48MHz/

SEL2.5_3.3#

25

I/O

SEL2.5_3.3# controls the Vdd of CPU. If logic 0 at

power on, VddLCPU=3.3V. If logic 1, VddLCPU=2.5

24MHz or 48MHz selected by I2C for Super I/O.

48MHz / *FS0

26

I/O

Internal 250k

Ω pull-up.

Latched input for FS0 at initial power up for H/W

selecting the output frequency of CPU, SDRAM and

PCI clocks. 48MHz output for USB during normal

operation.

5.5 Power Pins

SYMBOL

FUNCTION

Vdd

1

Power supply for REF crystal and core logic.

VddLCPU

47

Power supply for CPUCLK_F and CPUCLK[0:1], either

2.5V or 3.3V.

VddP

6,15

Power supply for PCI outputs.

VddSD

19,27,30,36,42

Power supply for SDRAM and 48/24NHz outputs.

Vss

3,10,16,22,33,39,44 Circuit Ground.

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