W83194BR-730 Datasheet, PDF (1/14 Pages) Winbond – 166MHZ CLOCK FOR SIS CHIPSET

W83194BR-730
166MHZ CLOCK FOR SIS CHIPSET
1.0 GENERAL DESCRIPTION
The W83194BR-730 is a Clock Synthesizer which provides all clocks required for high-speed RISC or
CISC microprocessor such as AMD K7. W83194BR-730 provides 64 CPU/PCI frequencies which are
selectable with smooth transitions by hardware or software. W83194BR-730 also provides 13 SDRAM
clocks.
The W83194BR-730 provides step-less frequency programming by controlling the VCO freq. and the
programmable PCI clock output divisor ratio. A watch dog timer is quipped and when time out, the
RESET# pin will output 4ms pulse signal.
The W83194BR-730 accepts a 14.318 MHz reference crystal as its input. Spread spectrum built in at
0~-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 CPU clock)
• 13 SDRAM clocks for 3 DIMMs
• 6 PCI synchronous clocks
• 2 AGP clocks
• 2 REF clocks as 14.318MHz outputs
• < 250ps skew among CPU and SDRAM clocks
• < 250ps skew among PCI clocks
• Skew from CPU(earlier) to PCI clock 1 to 4ns, center 2.6ns.
• Smooth frequency switch with selections from 66 MHz to 200 MHz CPU
• Stepless frequency programming by controlling the VCO freq. and the clock output divisor ratio
• Programmable skew for CPU to SDRAM and CPU to AGP clock outputs
• I²C 2-Wire serial interface and I²C read back
• ±0.25% or 0~-0.5% spread spectrum function to reduce EMI
• Programmable registers to enable/stop each output and select modes
• MODE pin for power Management and RESET# out when system hang
• One 48 MHz for USB & one 24_48 MHz for super I/O
• 48-pin SSOP package
Publication Release Date: Oct. 2000
-1-
Revision 0.60