W83194BR-740

The W83194BR-740 is a Clock Synthesizer for SiS 735/740 chipset. W83194BR-740 provides all clocks required for high-speed RISC or CISC microprocessor such as AMD K7, and also provides 16 different frequencies of CPU clocks frequency setting. All clocks are externally selectable with smooth transitions. The W83194BR-740 makes SDRAM in synchronous or asynchronous frequency with CPU clocks.

The W83194BR-740 provides step-less frequency programming by controlling the VCO freq. and the programmable AGP, PCI clock output divisor ratio. A watch dog timer is quipped and when time out, the RESET# pin will output 4ms pulse signal. Spread spectrum built in at ±0.5% or ±0.25% to reduce EMI. Programmable stopping individual clock outputs and frequency selection through I2C interface

The W83194BR-740 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply. High drive PCI 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 as maintaining 50± 5% duty cycle. The fixed frequency outputs as REF, 24MHz, and 48 MHz provide better than 0.5V /ns slew rate.