GENERAL DESCRIPTION

The W83195BR-341 is a Clock Synthesizer for Intel P4 Springdale/Prescott series chipset and support AMD Athlon processors. W83195BR-341 provides all clocks required for high-speed microprocessor and provides step-less frequency programming and 32 different frequencies of CPU, AGP, and PCI clocks setting. All clocks are externally selectable with smooth transitions.

The W83195BR-341 provides I2C serial bus interface to program the registers to enable or disable each clock outputs and provides +/-0.25, +/-0.5 center type and –0.5, -1.0 down type spread spectrum or programmable S.S.T. scale to reduce EMI.

The W83195BR-341 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.

PRODUCT FEATURES

• 1 pairs differential clock for CPU (P4 or Athlon)

• 1 pairs differential clock for Chipset

• 3 AGP clock outputs

• Support two DDR DIMMS or three SDRAM DIMMS

• 7 PCI synchronous clocks, 1 free running

• 1 48MHz clock outputs for USB

• 1 24_48MHz for I/O chip, default 24MHz

• 2 REF 14.318MHz clock outputs

• AGP leads PCICLK from 1.5ns to 3.5ns

• I2C 2-Wire serial interface supports block and byte mode read/write

• Step-less frequency programming

• Smooth frequency switch with selections from 66 to 200MHz

• Programmable clock outputs Slew rate control and Skew control

• +/- 0.25 center type spread spectrum in table mode

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

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

• 56-pin SSOP package