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W83194R-39

Part Number	W83194R-39
Manufacturer	Winbond
Description	100MHZ 3-DIMM CLOCK
Published	Apr 17, 2005
Detailed Description	W83194R-39/-39A 100MHZ 3-DIMM CLOCK 1.0 GENERAL DESCRIPTION The W83194R-39/-39A is a Clock Synthesizer which provides al...
Datasheet	W83194R-39 PDF File

Overview

W83194R-39/-39A 100MHZ 3-DIMM CLOCK 1.
0 GENERAL DESCRIPTION The W83194R-39/-39A is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel Pentium II.
W83194R-39 provides eight different frequency of CPU and PCI clocks and W83194R-39A provides sixteen CPU/PCI frequencies which are externally selectable with smooth transitions.
W83194R-39/-39A also provides 13 SDRAM clocks controlled by the none-delay buffer_in pin.
The W83194R-39/-39A accepts a 14.
318 MHz reference crystal as its input and runs on a 3.
3V supply.
Spread spectrum built in at ¡Ó0.
5% or ¡Ó0.
25% to reduce EMI.
Programmable stopping individual clock outputs and frequency selection through I2C interface.
The device meets the Pentium power-up stabilization, which requires CPU and PCI clocks be stable within 2 ms after power-up.
It is not recommend to use the dual function pin for the slots(ISA, PCI, CPU, DIMM).
The add on cards may have a pull up or pull down.
High drive six PCI and thirteen SDRAM CLOCK outputs typically provide greater than 1 V /ns slew rate into 30 pF loads.
Two CPU CLOCK outputs typically provide better than 1 V /ns slew rate into 20 pF loads as maintaining 50¡Ó 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 • Supports Pentium™ II CPU with I2C.
• 2 CPU clocks (one free-running CPU clock) • 13 SDRAM clocks for 3 DIMs • 6 PCI synchronous clocks • One IOAPIC clock for multiprocessor support • Optional single or mixed supply: (Vddq1=Vddq2 = Vddq3 = Vddq4 = VddL1 =VddL2= 3.
3V) or (Vddq1= Vddq2 = Vddq3=Vddq4 = 3.
3V, VddL1 = VdqL2 = 2.
5V) • < 250ps skew among CPU and SDRAM clocks • < 250ps skew among PCI clocks • < 5ns propagation delay SDRAM from buffer input • • • Skew from CPU(earlier) to PCI clock -1 to 4ns, center 2.
6ns.
Smooth frequency switch with selections from 50 MHz to 133 MHz CPU I C 2-Wire serial interface and I C read back 2 2 -1- Publicatio...

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