W83196S-14

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 I C 2 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 I C 2-Wire serial interface and I C read back ±0.5% center type spread spectrum function to reduce EMI Programmable r...