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W83196S-14

100 MHZ CLOCK FOR BX CHIPSET (2 CHIP)

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Preliminary W83196S-14

100 MHZ CLOCK FOR BX CHIPSET (2 CHIP)

1. GENERAL DESCRIPTION

The W83196S-14 is a Clock Synthesizer which provides all clocks required for high-speed RISC or

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

with smooth transitions.

The W83196S-14 provides I2C serial bus interface to program the registers to enable or disable each

clock outputs and choose the 0.5% center type spread spectrum to reduce EMI.

The W83196S-14 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 1V/nS slew rate into 30 pF loads. CPU

CLOCK outputs typically provide better than 1V/nS slew rate into 20 pF loads as maintaining 50 ±5%

duty cycle. The fixed frequency outputs as REF, 24 MHz, and 48 MHz provide better than 0.5V/nS

slew rate.

2. FEATURES

• Supports Pentium™ II CPUs with I2C

• 12 sets of CPU frequencies selection

• 2 CPU clocks (one free running CPU clock)

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

• Optional single or mixed supply:

(VDDR = VDDCore = VDDP = VDD4 = 3.3V ±5%)

(VDDA = VDDC = 2.5V ±5%)

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

• CPU clock jitter less than 200 pS

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

• Smooth frequency switch with selections from 66.8 MHz to 150 MHz CPU

• I2C 2-Wire serial interface and I2C read back

• ±0.5% center type spread spectrum function to reduce EMI

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

(mode as Tri-state or Normal )

• MODE pin for power management

• 48 MHz for USB

• 24 MHz for super I/O

• Packaged in 28-pin SOP

Publication Release Date: March 1999

-1-

Revision A1

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