W83194R-39A Description
The W83194R-39/-39A is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel Pentium II. W83194R-39 provides eight different frequency of CPU and PCI clocks and W83194R-39A provides sixteen CPU/PCI frequencies which are externally selectable with smooth transitions. W83194R-39/-39A also provides 13 SDRAM clocks controlled by the none-delay buffer_in pin.
W83194R-39A Key Features
- Supports Pentium™ II CPU with I2C
- 2 CPU clocks (one free-running CPU clock)
- 13 SDRAM clocks for 3 DIMs
- 6 PCI synchronous clocks
- One IOAPIC clock for multiprocessor support
- < 250ps skew among CPU and SDRAM clocks
- < 250ps skew among PCI clocks
- < 5ns propagation delay SDRAM from buffer input
- Skew from CPU(earlier) to PCI clock -1 to 4ns, center 2.6ns. Smooth frequency switch with selections from 50 MHz to 133
- ¡Ó0.25% or ¡Ó0.5% spread spectrum function to reduce EMI Programmable registers to enable/stop each output and select mo