W83194R-630_07 Datasheet, PDF (6/15 Pages) Winbond – 166MHZ CLOCK FOR SIS CHIPSET

W83194R-630/-630A
5.3 I²C Control Interface
SYMBOL
PIN
*SDATA
23
*SDCLK
24
I/O
FUNCTION
I/O Serial data of I²C 2-wire control interface
IN Serial clock of I²C 2-wire control interface
5.4 Fixed Frequency Outputs
SYMBOL
PIN
REF0X2 / *FS3
2
REF1
48
24_48MHz/
SEL2.5_3.3#
25
48MHz / *FS0
26
I/O
FUNCTION
3.3V, 14.318MHz reference clock output .
Internal 250kΩ pull-up.
I/O _{Latched input for FS3 at initial power up for H/W}
selecting the output frequency of CPU, SDRAM and
PCI clocks.
I/O 3.3V , 14.318MHz reference clock output.
SEL2.5_3.3# controls the Vdd of CPU. If logic 0 at
I/O ^{power on, VddLCPU=3.3V. If logic 1, VddLCPU=2.5}
24MHz or 48MHz selected by I2C for Super I/O.
Internal 250kΩ pull-up.
Latched input for FS0 at initial power up for H/W
I/O _{selecting the output frequency of CPU, SDRAM and}
PCI clocks. 48MHz output for USB during normal
operation.
5.5 Power Pins
SYMBOL
Vdd
VddLCPU
VddP
VddSD
Vss
PIN
FUNCTION
1
Power supply for REF crystal and core logic.
47
Power supply for CPUCLK_F and CPUCLK[0:1], either
2.5V or 3.3V.
6,15
Power supply for PCI outputs.
19,27,30,36,42
Power supply for SDRAM and 48/24NHz outputs.
3,10,16,22,33,39,44 Circuit Ground.
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