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Winbond - 200MHZ 3-DIMM CLOCK FOR SOLANO CHIPSET

Numéro de référence W83195AR-25
Description 200MHZ 3-DIMM CLOCK FOR SOLANO CHIPSET
Fabricant Winbond 
Logo Winbond 





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W83195AR-25 fiche technique
W83195AR-25
200MHZ 3-DIMM CLOCK FOR SOLANO CHIPSET
1.0 GENERAL DESCRIPTION
The W83195AR-25 is a Clock Synthesizer for Intel 815 Solano chipset. W83195AR-25 provides all
clocks required for high-speed RISC or CISC microprocessor and also provides 64 different
frequencies of CPU, SDRAM, PCI, 3V66, IOAPIC clocks frequency setting. All clocks are externally
selectable with smooth transitions.
The W83195AR-25 provides I2C serial bus interface to program the registers to enable or disable
each clock outputs and provides 0.25% and 0.5% center type spread spectrum to reduce EMI.
The W83195AR-25 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
High drive PCI and SDRAM CLOCK outputs typically provide greater than 1 V /ns slew rate into 30
pF loads. CPU CLOCK outputs typically provide better than 1 V /ns slew rate into 20 pF loads as
maintaining 50± 5% duty cycle. The fixed frequency outputs as REF, 24MHz, and 48 MHz provide
better than 0.5V /ns slew rate.
2.0 PRODUCT FEATURES
2 CPU clocks (2.5V)
3 3V-66 clocks (3.3V)
12 SDRAM clocks for 3 DIMMs(3.3V)
8 PCI synchronous clocks.
Optional single or mixed supply:
(VDDR = VDDP=VDDS = VDD48 = VDD3 = 3.3V, VDDA=VDDC=2.5V)
Skew form CPU to PCI clock -1 to 4 ns, center 2.6 ns
Smooth frequency switch with selections from 66.8 to 200MHz
I2C 2-Wire serial interface and I2C read back
0.25% center and 0.5% center type spread spectrum
Programmable registers to enable/stop each output and select modes
(mode as Tri-state or Normal )
48 MHz for USB
24 MHz for super I/O
Packaged in 56-pin SSOP
Publication Release Date: Jan. 2000
- 1 - Revision 0.40

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