W83194BR-PT View Datasheet(PDF) - Winbond

Part Name

Description

Manufacturer

W83194BR-PT

STEPLESS VIA PT MAIN CLOCK GENERATOR

Winbond 

W83194BR-PT

1. GENERAL DESCRIPTION

The W83194BR-PT is a Clock Synthesizer for VIA PT chipset. W83194BR-PT 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. All clocks are externally selectable with

smooth transitions.

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

hanging caused by improper frequency setting.

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

2. PRODUCT FEATURES

• 2 Differential pairs of CPU clock outputs

• 1 Differential pairs push pull of CPU_CS clock outputs

• 3 AGP clock outputs

• 9 PCI synchronous clocks

• 24_48Mhz clock output for super I/O.

• 48 MHz clock output for USB.

• 2 IOAPIC clock outputs.

• 1 REF clock output.

• Skew form CPU to PCI clock 1 to 4 ns, center 2.6 ns

• Smooth frequency switch with selections from 100 to 200MHz

• 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

• Watch Dog Timer and RESET# output pins

• 48-pin SSOP package

Publication Release Date: April 13, 2005

-1-

Revision 1.1

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