W83194BR-KX

W83194BR-KX STEP-LESS 3-DIMM K7 CLOCK 1.0 GENERAL DESCRIPTION The W83194BR-KX is a Clock Synthesizer which provides all clocks required for AMD K7. W83194BR-KX provides 64 CPU/PCI frequencies which are selectable with smooth transitions by hardware or software. W83194BR-KX also provides 13 SDRAM clocks controlled by the none-delay buffer_in pin. The W83194BR-KX provides step-less frequency programming by controlling the VCO freq. and the programmable PCI clock output divisor ratio. A watchdog timer is quipped and when time out, the RESET# pin will output 4ms pulse signal. The W83194BR-KX accepts a 14.318 MHz reference crystal as its input. 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 device meets the Pentium power-up stabilization, which requires CPU and PCI clocks be stable within 2 ms after power-up. Using dual function pin for the slots (ISA, PCI, CPU, DIMM) is not recommend. 2.0 PRODUCT FEATURES Supports AMD CPU with I2C. 3 CPU clocks (one free-running chipset clock controlled by I2C) 13 SDRAM clocks for 3 DIMMs 6 PCI synchronous clocks One IOAPIC clock for multiprocessor support Optional single or mixed supply: (Vddq1=Vddq2 = Vddq3 = Vddq4 = VddL1 =VddL2= 3.3V) or (Vddq1= Vddq2 = Vddq3=Vddq4 = 3.3V, VddL1 = VdqL2 = 2.5V) < 250ps skew among CPU and SDRAM clocks < 250ps skew among PCI clocks < 5ns propagation delay SDRAM from buffer input Skew from ...