w83194br-b Winbond Electronics Corp America, w83194br-b Datasheet - Page 9

• Manufacturer Part Number: w83194br-b
• Description: Winbond Clock Generator For Intel P4 845 Series Chipset
• Manufacturer: Winbond Electronics Corp America

5.2
47, 46, 44,
43, 40, 39
PIN
38
37
23
26
31
5
CPU, 3V66, PCI Clock Outputs
CPUCLKC [0:2]
CPUCLKT [0:2]
VTT_PWRGD
MULTISEL0*
CLOCK GEN. FOR INTEL P4 845 SERIES CHIPSET
PIN NAME
VCH_CLK
PCICLK8^
RESET#
3V66_0
PD#*
IREF
FS4
FS0
&
&
IN
IN
TYPE
OUT
OUT
OUT
OUT PCI clock output. This pin is with x1.5 ~ x2 driving strength.
OD
IN
IN
IN
IN
td120k
td120k
Differential clock outputs for host frequencies of CPU and
chipset
Power on trapping for different current reference. The
reference current is referred for Pin 37 (IREF). This pin is
latched during VTT_PWRGD. This pin is internal pull up
120K.
Deciding the reference current for the CPUCLK pairs.The pin
was connected to the precision resistor tied to ground to
decide the appropriate current. There are two mode to select
different current via power on trapping the Pin 38
(MULTISEL0). The table is show as follows.
System reset signal when the watch dog is time out. This pin
will generate 250mS when the watchdog timer is timeout.
Power good input signal comes from ACPI with high active.
This 3.3V input is level sensitive strobe used to determine FS
[4:0] and MULTISEL0 input are valid and is ready to sample.
This pin is high active.
Power Down Function. This is internal 120K pull up. This is
multi-function pin. When the VTT_PWRGD signal is asserted
(this is, turns from a logical Low to high), the pin will be
switched into the function of power down (PD#).
66MHz or 48MHz outputs selected by I2C register.
Latched input for FS4 at initial power up for H/W selecting the
output frequency of CPU 3V66 and PCI clocks. This is
internal 120K pull down.
Latched input for FS0 at initial power up for H/W selecting the
output frequency of CPU, 3V66 and PCI clocks. This is
internal 120K pull down.
MULTS
EL0
0
1
- 5 -
50 Ohms
50 Ohms
TARGET
BOARD
TRACE
W83194BR-B/W83194BG-B
REFERENCE
Iref=232mA
DESCRIPTION
Iref=5.0mA
Publication Release Date: October 2006
R, IREF
R=221
R=475
CURRENT
Ioh=4*Iref 1.0V @ 50
Ioh=6*Iref 0.7V @ 50
OUTPUT
IOH @ Z
Revision 3.1