W83194R-17/-17A Winbond Electronics Corp America, W83194R-17/-17A Datasheet - Page 2

• Manufacturer Part Number: W83194R-17/-17A
• Description: 100MHz Sis 5595, 5598 Clock Gen.
• Manufacturer: Winbond Electronics Corp America

1.0 GENERAL DESCRIPTION
The W83194R-17/-17A is a Clock Synthesizer, which provides all clocks required for high-speed RISC
or CISC microprocessor such as Intel PentiumII, Pentium, AMD or Cyrix. Eight different frequencies of
CPU, AGP and PCI clocks are externally selectable with smooth transitions. The W83194R-17/-17A
provides AGP clocks especially for clone chipset.
W83194R-17 is up to 100MHz, but the one of W83194R-17A is up to 133MHz.
The W83193R-17/-17A provides I
each clock outputs and choose the 0.5% or 1.5% center type spread spectrum to reduce EMI.
The W83194R-17/-17A 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
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Skew form CPU to PCI clock -1 to 4 ns, center 2.6 ns, AGP to CPU sync. Skew 0 ns (250 ps)
Smooth frequency switch with selections from 60 MHz to 133 MHz CPU
±0.5% or ±1.5% center type spread spectrum function to reduce EMI
Supports Pentium, Pentium Pro, Pentium II, AMD and Cyrix CPUs with I
4 CPU clocks
12 SDRAM clocks for 3 DIMMs
Two AGP clocks
6 PCI synchronous clocks.
Optional single or mixed supply:
I
Programmable registers to enable/stop each output and select modes
MODE pin for power Management
48 MHz for USB
24 MHz for super I/O
48-pin SSOP package
2
(Mode as Tri-state or Normal)
C 2-Wire serial interface and I
(Vdd = Vddq3 = Vddq2 = Vddq2b = 3.3V) or (Vdd =Vddq2 = Vddq3 = 3.3V, Vddq2b = 2.5V)
- 2 -
2
C serial bus interface to program the registers to enable or disable
2
C read back
The highest CPU frequency provided by the
Publication Release Date: Sep. 1998
2
C.
Revision 1.0