w83194br-323 Winbond Electronics Corp America, w83194br-323 Datasheet - Page 6

• Manufacturer Part Number: w83194br-323
• Description: Clock For Intel Chipsets
• Manufacturer: Winbond Electronics Corp America

5. PIN DESCRIPTION
5.1
5.2
31,30,28 3V66_0:2
IN
IN
OUT
OD
I/O
I/OD
#
*
&
41,38,
40,37
45,44
BUFFER TYPE SYMBOL
PIN
td120k
27
35
20
19
PIN
3
4
Crystal I/O
CPU, 3V66, and PCI Clock Outputs
STEPLESS CLOCK FOR INTEL BROOKDALE CHIPSET
CPUCLK_T [0:2]
CPUCLK_C [0:2]
3V66_3 / 48MHz
*SEL48_66
IREF
RESET#
VTTPWRGD#
XIN
XOUT
PIN NAME
PIN NAME
IN
IN
TYPE
OUT Low skew (< 250ps) differential clock outputs for host
OUT 3.3V 66MHz clock outputs.
OUT 3V66_3 or 48MHz clock output.
OD
Input
Input pin and internal 120K pull down
Output
Open Drain
Bi-directional Pin
Bi-directional Pin, Open Drain
Active Low
Internal 120kΩ pull-up
Internal 120kΩ pull-down
IN
tp120k
TYPE
OUT Crystal output at 14.318MHz nominally with internal loading
IN
frequencies of CPU and chipset.
Latched input for 48MHz or 66MHz select pin. This is internal
120K pull up default 66MHz. In power on reset period, it is a
hardware-latched pin, and it can be R/W by I2C control after
power on reset period. Select by register 16 bit 6.
Deciding the reference current for the CPUCLK pairs. The
System reset signal when the watchdog is time out. This pin will
generate 250ms low phase when the watchdog timer is timeout.
Power good input signal comes from ACPI with low active. This
3.3V input is level sensitive strobe used to determine FS [4:0]
and MULTISEL0, MULTISEL1, input are valid and is ready to
sampled. This pin is low active.
pin was connected to the precision resistor tied to ground to
decide the appropriate current. There are several modes to
select different current via power on trapping the Pin 1 & 48
(MULTISEL0, 1). The table is show as follows.
Crystal input with internal loading capacitors (18pF) and
feedback resistors.
capacitors (18pF).
W83194BR-323/W83194BG-323
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DESCRIPTION
DESCRIPTION
DESCRIPTION
Publication Release Date: March 2006
Revision 2.1