W83194R-58A

The W83194R-58A is a Clock Synthesizer for VIA chipset. W83194R-58A provides all clocks required for high-speed RISC or CISC microprocessor such as Intel PentiumII and also provides 16 different frequencies of CPU clocks by software setting. AGP and PCI clocks are externally selectable with smooth transitions. The W83194R-58A provides AGP clocks especially for clone chipset, and makes SDRAM in synchronous frequency with CPU or AGP clocks.

The W83194R-58A provides I²C serial bus interface to program the registers to enable or disable each clock outputs and choose the 0.25%, 0.5% or 0.5%,1.5% center type spread spectrum to reduce EMI.

The W83194R-58A accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply. High drive PCI and SDRAM CLOCK outputs typically provide greater than 1 V /ns slew rate into 30 pF loads. CPU CLOCK outputs typically provide better than 1 V /ns slew rate into 20 pF loads when maintaining 50± 5% duty cycle. The fixed frequency outputs as REF, 24MHz, and 48 MHz provide better than 0.5V /ns slew rate.