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W83194BR-911

Winbond STEPLESS VIA PT/PM MAIN CLOCK GENERATOR

Winbond 

W83194BR-911, W83194BG-911

STEPLESS CLOCK FOR VIA PT/PM CHIPSET

5.5 Power Management Pins

PIN

PIN NAME

TYPE

DESCRIPTION

34 VTT_PWRGD

IN Power good input signal is power on trapping with HIGH

active. This 3.3V input is level sensitive strobe used to

determine FS [4:0]. This pin is HIGH active.

PD#*

INtp120k Power Down Function. This is power down pin, low active

(PD#).

Internal 120K pull up

46 IREF

OUT 　 Deciding the reference current for the CPUCLK pairs.

The pin was connected to the precision resistor tied to

ground to decide the appropriate current.

45 RESET#

OD System reset signal when the watchdog is time out. This pin

will generate 250ms low phase when the watchdog timer is

timeout.

5.6 IREF selects Function

BOARD TARGET

TRACE/TERM Z

REFERENCE R, IREF =

ADD/(3*RR)

50 Ω

50 Ω

Rr =221 1%

IREF = 5.00mA

Rr =475 1%

IREF = 2.32mA

OUTPUT

CURRENT

Ioh=4*IREF

Ioh=6*IREF

VOH @ Z

1.0V @ 50

0.7V @ 50

5.7 Power Pins

PIN

PIN NAME

4

VDDREF

11,18,22

VDDPCI

28

VDDAGP

41

VDDCPU

26

VDD48

35

VDD2.5

48

7,12,19,25,29,

38,44,47

VDDA

GND

TYPE

DESCRIPTION

PWR 3.3V power supply for REF.

PWR 3.3V power supply for PCI.

PWR 3.3V power supply for AGP.

PWR 3.3V power supply for CPU.

PWR 3.3 power supply for 48MHz.

PWR 2.5V power supply for 25MHz.

PWR 3.3V power for Analog power

PWR Ground pin

Publication Release Date: March 2006

-5-

Revision 0.71

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