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W83L197R-16

2-CHIP 100MHZ CLOCK FOR BX NOTEBOOK

Winbond 

W83L197R-16

2-CHIP 100MHZ CLOCK FOR BX NOTEBOOK

1.0 GENERAL DESCRIPTION

The W83L197R-16 is a Clock Synthesizer which provides all clocks required for high-speed RISC or

CISC microprocessor. Four different frequency of CPU, and PCI clocks are externally selectable with

smooth transitions. The 0.5% or 0.75% center type spread spectrum can be selected to reduce EMI.

The W83L197R-16 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¡Ó

5% duty cycle. The fixed frequency outputs as REF, 48 MHz provide better than 0.5V /ns slew rate.

2.0 PRODUCT FEATURES

• Supports Pentium™ II CPUs

• 4 sets of CPU frequencies selection

• 2 CPU clocks (one free running CPU clock)

• 6 PCI synchronous clocks(one free running PCI clock)

• Optional single or mixed supply:

(Vdd3 = VddC= 3.3V±5%) or (VddC = 2.5V±5%)

• Skew form CPU to PCI clock 1.5 to 4.0 ns, CPU leads.

• CPU clock jitter less than 200ps

• PCI_F,PCI1:6 clock skew less than 500ps

• ¡Ó0.5% or ¡Ó0.75% center type spread spectrum function to reduce EMI

• Programmable registers to enable/stop each output and select modes

(mode as Tri-state or Normal )

• 48 MHz for USB

• 28-pin SOP package (209mil)

Publication Release Date: Mar. 1999

-1-

Revision 0.10

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