W83194AR-WE Datasheet, PDF (4/16 Pages) Winbond – 200MHZ CLOCK FOR WHITNEY CHIPSET

W83194AR-We
4.3 I²C Control Interface
SYMBOL
PIN
*SDATA
25
*SDCLK
28
PRELIMINARY
I/O
FUNCTION
I/O Serial data of I²C 2-wire control interface with internal
pull-up resistor.
IN Serial clock of I²C 2-wire control interface with
internal pull-up resistor.
4.4 Fixed Frequency Outputs
SYMBOL
PIN
REFX2 / *FS3
3
*SIO_SEL/24_48MHz
23
48MHz_0
21
48MHz_1/ FS4#
22
I/O
FUNCTION
I/O 14.318MHz reference clock. This REF output is the
stronger buffer for ISA bus loads.
Latched input for FS3 at initial power up for H/W
selecting the output frequency of CPU, SDRAM and
PCI clocks (Default=1).
I/O 24MHz or 48MHz output clock.
Latched input for SIO_SEL at initial power up for the
output frequency of 24MHz(HIGH) and 48MHz(LOW)
clocks.
O 48MHz output for USB during normal operation.
I/O 48MHz / Latched input for FS4 at initial power up
for H/W selecting the output frequency of CPU,
SDRAM and PCI clocks (Default=0).
4.5 Power Pins
SYMBOL
VddL
Vdd48
Vdd3
VddP
VddR
VddS
VddA
Vss
PIN
FUNCTION
48
Power supply for CPU & IOAPIC, 2.5V or 3.3V.
24
Power supply for 48MHz output,3.3V.
6
Power supply for 3V_66 output, 3.3V.
16
Power supply for PCICLK, 3.3V.
2
Power supply for REFX2, 3.3V.
42,34
Power supply for SDRAM[0:8], nominal 3.3V.
27
Power for I2C CLK and DATA.
5,9,13,20,26,30,38, Circuit Ground.
43
Publication Release Date: Nov. 1999
-4-
Revision 0.50