GENERAL DESCRIPTION
The W83195R-08 is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel Pentium II. W83195R-08 provides sixteen CPU/PCI frequencies which are externally selectable with smooth transitions. W83195R-08 also provides 17 SDRAM clocks controlled by the none-delay buffer_in pin.
PRODUCT FEATURES
● Supports PentiumÔ II CPU with I2C.
● 3 CPU clocks (one free-running CPU clock)
● 17 SDRAM clocks for 4 DIMs
● 7 PCI synchronous clocks
● Two IOAPIC clocks 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 CPU(earlier) to PCI clock -1 to 4ns, center 2.6ns.
● Smooth frequency switch with selections from 50 MHz to 133 MHz CPU
● I2C 2-Wire serial interface and I2C read back
● ¡Ó0.25% or ¡Ó0.5% center type spread spectrum function to reduce EMI
● Programmable registers to enable/stop each output and select modes
(mode as Tri-state or Normal )
● MODE pin for power Management
● One 48 MHz for USB & one 24 MHz for super I/O
● 56-pin SSOP package