PDF W83194BR-39B Data sheet ( Hoja de datos )

Número de pieza	W83194BR-39B
Descripción	STEP-LESS 3-DIMM CLOCK
Fabricantes	Winbond
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No Preview Available ! W83194BR-39B STEP-LESS 3-DIMM CLOCK 1.0 GENERAL DESCRIPTION The W83194BR-39B is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel Pentium II or Pentium III. W83194BR-39B provides 64 CPU/PCI frequencies which are selectable with smooth transitions by hardware or software. W83194BR-39B also provides 13 SDRAM clocks controlled by the none-delay buffer_in pin. The W83194BR-39B 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-39B 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 Pentium™ II and !!! CPU with I2C. • 2 CPU clocks (one free-running CPU clock) • 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 = VddL2 = 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 66 MHz to 200 MHz CPU • Step-less frequency programming by controlling the VCO freq. and the clock output divisor ratio • I2C 2-Wire serial interface and I2C read back • ±0.25% or ±0.5% spread spectrum function to reduce EMI in freq. table mode • Programmable spread spectrum in the M/N step-less mode • Programmable registers to enable/stop each output and select modes • MODE pin for power Management • RESET# out when watch dog timer time out • One 48 MHz for USB & one 24 MHz for super I/O Publication Release Date: June 2000 - 1 - Revision 0.46 1 page W83194BR-39B 5.0 FREQUENCY BY HARDWARE PRELIMINARY FS3 FS2 FS1 FS0 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 CPU(MHz) 80.00 75.00 83.30 66.82 103.00 112.00 68.01 100.23 120.00 115.00 120.00 105.00 140.00 155.00 124.00 133.30 SDRAM(MHz) 80.00 75.00 83.30 66.82 103.00 112.00 68.01 100.23 120.00 115.00 120.00 105.00 140.00 155.00 124.00 133.30 PCI(MHz) 40.00 37.50 41.65 33.41 34.33 37.34 34.01 33.41 30.00 38.33 40.00 35.00 35.00 38.75 31.00 33.30 Publication Release Date: June 2000 - 5 - Revision 0.46 5 Page W83194BR-39B 2 1 - Reserved 1 1 - Reserved 0 1 - Reserved 7.2.6 Register 5: Reserved Register Bit @PowerUp Pin 7 1 - Reserved 6 0 - Reserved 5 0 - Reserved 4 1 - Reserved 3 0 - Reserved 2 0 - Reserved 1 1 - Reserved 0 1 - Reserved Description 7.2.7 Register 6~11: M/N step-less mode control registers 7.2.12 Register 11: Winbond Chip ID Register (Read Only) Bit @PowerUp Pin Description 7 0 - Winbond Chip ID 6 1 - Winbond Chip ID 5 1 - Winbond Chip ID 4 0 - Winbond Chip ID 3 0 - Winbond Chip ID 2 0 - Winbond Chip ID 1 1 - Winbond Chip ID 0 0 - Winbond Chip ID 7.2.13 Register 12: Winbond Chip ID Register (Read Only) Bit @PowerUp Pin 7 0 - Winbond Chip ID 6 1 - Winbond Chip ID 5 0 - Winbond Chip ID 4 1 - Winbond Chip ID 3 0 - Winbond Version ID Description PRELIMINARY - 11 - Publication Release Date: June 2000 Revision 0.46 11 Page

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Número de pieza	Descripción	Fabricantes
W83194BR-39B	STEP-LESS 3-DIMM CLOCK	Winbond

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