W167B

PRELIMINARY W167B 133-MHz Spread Spectrum FTG for Pentium® II Platforms Features Maximized EMI Suppression using Cypress’s Spread Spectrum technology Three copies of CPU outputs selectable frequency Three copies of 3V66 selectable frequency output at 3.3V Ten copies of PCI clocks (selectable frequency), 3.3V One double strength 14.318-MHz reference output at 3.3V One copy of 48-MHz USB clock One copy of selectable 24-/48-MHz for SIO One copy of CPU-divide-by-2 output as reference input to Direct Rambus™ Clock Generator (Cypress W134) Three copies of IOAPIC Available in 48-pin SSOP (300 mils) Duty Cycle: ................................................................ 45/55% Spread Spectrum Modulation:................................... ±0.25% CPU to 3V66 Output Offset: ............. 0.0–1.5 ns (CPU leads) 3V66 to PCI Output Offset:.............. 1.5–4.0 ns (3V66 leads) CPU to IOAPIC Output Offset: ......... 1.5–4.0 ns (CPU leads) Table 1. Pin Selectable Frequency SEL133/ CPU 100# SEL2 SEL1 SEL0 MHz 1 1 1 1 133.3 1 1 1 0 138 1 1 0 1 143 1 1 0 0 148 1 0 1 1 150 1 0 1 0 152.5 1 0 0 1 155 1 0 0 0 160 0 1 1 1 100.2 0 1 1 0 105 0 1 0 1 114 0 1 0 0 120 0 0 1 1 66.8 0 0 1 0 124 0 0 0 1 128.5 0 0 0 0 133.9 3V66 MHz 66.7 69 71.5 74 75 76.3 77.5 80 66.8 70 76 80 66.8 82.7 64.3 67 PCI IOAPIC MHz MHz 33.3 16.7 34.5 17.3 35.8 17.9 37 18.5 37.5 18.8 38.1 19.1 38.8 19.4 40 20 33.4 16.7 35 17.5 38 19 40 20 33.4 16.7 41.3 20.7 32.1 16.1 33.5 16.7 Key Specifications Suppl...