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W83194BG-903

STEPLESS VIA PT/PM MAIN CLOCK GENERATOR

Winbond 

W83194BR-903/W83194BG-903

1. GENERAL DESCRIPTION

The W83194BR-903 is a Clock Synthesizer for VIA PT880/PM880 chipset. W83194BR-903 provides

all clocks required for high-speed microprocessor and provides step-less frequency programming and

32 different frequencies of CPU, PCI, and AGP clocks setting, support two 25MHz clock outputs, all

clocks are externally selectable with smooth transitions.

The W83194BR-903 provides I2C serial bus interface to program the registers to enable or disable

each clock outputs and provides -0.5% and +/-0.25% center type spread spectrum or programmable

S.S.T. scale to reduce EMI.

The W83194BR-903 also has watchdog timer and reset output pin to support auto-reset when

systems hanging caused by improper frequency setting.

The W83194BR-903 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.

2. PRODUCT FEATURES

• 3 0.7V current-mode Differential pairs clock outputs

• 2 2.5V 25MHz clock outputs

• 3 AGP clock outputs

• 10 PCI synchronous clocks

• 1 24_48Mhz clock output for super I/O.

• 1 48 MHz clock output for USB.

• 2 14.318MHz REF clock outputs.

• AGP/PCI clock out supports synchronous and asynchronous mode

• Smooth frequency switch with selections from 100 to 400MHz

• Step-less frequency programming

• I2C 2-Wire serial interface and support byte read/write and block read/write.

• -0.5% and +/- 0.25% center type spread spectrum

• Programmable S.S.T. scale to reduce EMI

• Programmable registers to enable/stop each output and select modes

• Programmable clock outputs Slew rate control and Skew control

• Watch Dog Timer and RESET# output pins

• 48-pin SSOP package

Publication Release Date: May 2006

-1-

Revision 1.0

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