W83194BR-C Datasheet, PDF (1/13 Pages) Winbond – 200MHZ CLOCK FOR CAMINO CHIPSET

W83194BR-C
200MHZ CLOCK FOR CAMINO CHIPSET
1.0 GENERAL DESCRIPTION
The W83194BR-C is a Clock Synthesizer for Intel Camino 820 chipset. W83194BR-C provides all
clocks required for high-speed RISC or CISC microprocessor and also provides 64 different
frequencies of CPU, PCI, 3V66, IOAPIC clocks frequency setting. All clocks are externally selectable
with smooth transitions.
The W83194BR-C provides I²C serial bus interface to program the registers to enable or disable each
clock outputs and provides 0.5% and 0.75% center type spread spectrum to reduce EMI.
The W83194BR-C 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.
2.0 PRODUCT FEATURES
• 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
• I²C 2-Wire serial interface and I²C 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
Publication Release Date: Dec. 1999
-1-
Revision 0.40