W83194R-37/-58 Winbond Electronics Corp America, W83194R-37/-58 Datasheet - Page 2

• Manufacturer Part Number: W83194R-37/-58
• Description: 100MHz/133MHz Via MVP3, Via Apollo Pro Clock Gen., 3-DIMM, With S.S.T.
• Manufacturer: Winbond Electronics Corp America

1.0 GENERAL DESCRIPTION
The W83194R-37/-58 is a Clock Synthesizer for VIA chipset.
required for high-speed RISC or CISC microprocessor such as Intel PentiumPro , AMD or Cyrix. Eight
different frequencies of CPU, W83194R-58 provides all clocks required for high-speed RISC or
CISC microprocessor such as Intel PentiumII and also provides 16 different frequencies of CPU
clocks by software setting(additional register0 bit2). AGP and PCI clocks are externally selectable
with smooth transitions. The W83194R-37/-58 provides AGP clocks especially for clone chipset, and
makes SDRAM in synchronous frequency with CPU or AGP clocks.
The W83194R-37/-58 provides I
each clock outputs and choose the 0.25%, 0.5% or 0.5%,1.5% center type spread spectrum to reduce
EMI.
The W83194R-37/-58 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
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Skew form CPU to PCI clock -1 to 4 ns, center 2.6 ns, AGP to CPU sync. skew 0 ns (250 ps)
SDRAM frequency synchronous to CPU or AGP clocks
Smooth frequency switch with selections from 60 to 100 MHz CPU(-37) and 66 to 150MHz(-58)
±0.5% or ±1.5%(-37) and 0.25%, 0.5%(-58) center type spread spectrum to reduce EMI
Supports Pentium, Pentium Pro, Pentium II, AMD and Cyrix CPUs with I
4 CPU clocks
12 SDRAM clocks for 3 DIMs
Two AGP clocks
6 PCI synchronous clocks.
Optional single or mixed supply:
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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
Packaged in 48-pin SSOP
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(mode as Tri-state or Normal )
C 2-Wire serial interface and I
(Vdd = Vddq3 = Vddq2 = Vddq2b = 3.3V) or (Vdd = Vddq3 = Vddq2 = 3.3V, Vdq2b = 2.5V)
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C serial bus interface to program the registers to enable or disable
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C read back
W83194R-37 provides all clocks
Publication Release Date: Sep 1998
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C.
Revision 1.0