W83194BR-97
200MHZ CLOCK FOR CAMINO CHIPSET
1.0 GENERAL DESCRIPTION
The W83194BR-97 is a Clock Synthesizer for Intel Camino 820 chipset. W83194BR-97 provides all
clocks required for high-speed RISC or CISC microprocessor and also provides 64 sets of different
frequencies of CPU, PCI, 3V66, IOAPIC clocks or stepless frequecies programming by M/N value via
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I C registers. All clocks are externally selectable with smooth transitions.
The W83194BR-97 provides I C serial bus interface to program the registers to enable or disable
each clock outputs and provides 0.5% and 0.25% center type spread spectrum to reduce EMI.
The W83194BR-97 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
High drive PCI 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.
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2.0 PRODUCT FEATURES
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2 CPU clock outputs
One CPU/2 output as reference input to DRCG
3 3V66 clock outputs
3 IOAPIC clock outputs
8 PCI synchronous clocks.
Optional single or mixed supply:
(VddQ2 = VddQ3 = 3.3V or VddQ3=3.3V, VddQ2=2.5V)
CPU to 3V66 offset 0 to 1.5 ns
3V66 to PCI offset 1.5 to 4.0 ns
Skew form CPU to PCI clock 1 to 4 ns, center 2.6 ns
Smooth frequency switch with selections from 66.8 to 200MHz
2
Stepless programmable frequencies by I C register9 ~ register12
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I C 2-Wire serial interface and I C read back
0.5% and 0.75% center type spread spectrum
Programmable registers to enable/stop each output and select modes
(mode as Tri-state or Normal )
48 MHz pins for USB
24 MHz for super I/O
48-pin SSOP package
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Publication Release Date: Dec. 1999
Revision 0.35
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