W83193R-02 Datasheet, PDF (4/18 Pages) Winbond – 83.3 MHZ 3-DIMM CLOCK

Preliminary W83193R-02/-04/-04A
5.3 I²C Control Interface
SYMBOL
SDATA
SDCLK
PIN I/O
FUNCTION
23 I/O Serial data of I²C 2-wire control interface
24 IN Serial clock of I²C 2-wire control interface
5.4 Fixed Frequency Outputs
SYMBOL
REF0/CPU3.3#_2.5
REF1/CPU_STOP#
24MHz / *MODE
48MHz / *FS0
PIN I/O
FUNCTION
2 I/O Internal 250kΩ pull-up.
Latched input for CPU3.3#_2.5 at initial power up. Reference
clock during normal operation.
Latched high - VDDq2 = VDDq2b = 2.5V
Latched low - VDDq2 = VDDq2b = 3.3V
46 I/O Internal 250 KΩ pull-up.
If MODE = 1 (default), then this pin is a REF1 buffered output
of the crystal. If MODE = 0 , then this pin is CPU_STOP#
input used in power management mode for synchronously
stopping the all CPU clocks.
25 I/O Internal 250 KΩ pull-up.
Latched input for MODE at initial power up. 24 MHz output for
super I/O during normal operation.
26 I/O Internal 250 KΩ pull-up.
Latched input for FS0 at initial power up for H/W selecting the
output frequency of CPU, SDRAM and PCI clocks. 48 MHz
output for USB during normal operation.
5.5 Power Pins
SYMBOL
VDD
VDDq2
VDDq2b
VDDq3
VSS
PIN
FUNCTION
1
Power supply for Ref [0:1] crystal and core logic.
42
Power supply for CPUCLK[0:3], either 2.5V or 3.3V.
48
Power supply for IOAPIC output, either 2.5V or 3.3V.
6, 14, 19, 30, 36 Power supply for SDRAM, PCICLK and 48/24 MHz outputs.
3, 9, 16, 22, 27, 33, Circuit Ground.
39, 45
-4-