W161

PRELIMINARY W161 133-MHz Spread Spectrum FTG for Pentium® II Platforms Features Maximized EMI Suppression using Cypress’s Spread Spectrum Technology Three copies of CPU outputs at 100 or 133 MHz Three copies of 66-MHz output at 3.3V Ten copies of PCI clocks at 33 MHz, 3.3V Two copies of 14.318-MHz reference output at 3.3V One copy of 48-MHz USB clock One copy of CPU-divide-by-2 output as reference input to Direct Rambus™ Clock Generator (Cypress W134) Available in 48-pin SSOP (300 mils) Spread Spectrum Modulation:..................................... –0.5% CPU to 3V66 Output Offset: ............. 0.0–1.5 ns (CPU leads) 3V66 to PCI Output Offset:.............. 1.5–3.0 ns (3V66 leads) CPU to IOAPIC Output Offset: ......... 1.5–4.0 ns (CPU leads) Table 1. Pin Selectable Frequency SEL133/100# SEL1 SEL0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 Function All outputs Three-State (Reserved) Active 100-MHz, 48-MHz PLL inactive Active 100-MHz, 48-MHz PLL active Test Mode (Reserved) Active 133-MHz, 48-MHz PLL inactive Active 133-MHz, 48-MHz PLL active Key Specifications Supply Voltages: ...................................... VDDQ2 = 2.5V±5% VDDQ3 = 3.3V±5% CPU, CPUdiv2 Output Jitter:....................................... 250 ps CPU, CPUdiv2 Output Skew: ...................................... 175 ps IOAPIC, 3V66 Output Skew: ....................................... 250 ps PCI0:9 Output Skew: .................................................. 500 ps Duty Cycle: .....