W144

PRELIMINARY W144 440BX AGPset Spread Spectrum Frequency Synthesizer Features Maximized EMI suppression using Cypress’s Spread Spectrum technology Single chip system frequency synthesizer for Intel® 440BX AGPset Two copies of CPU output Six copies of PCI output One 48-MHz output for USB One 24-MHz output for SIO Two buffered reference outputs One IOAPIC output Thirteen SDRAM outputs provide support for 3 DIMMs Supports frequencies up to 150 MHz I2C™ interface for programming Power management control inputs Table 1. Mode Input Table Mode 0 1 PCI_STOP# REF0 Pin2 Table 2. Pin Selectable Frequency FS3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 Input Address CPU_F, CPU1 FS2 FS1 FS0 (MHz) PCI_F, 1:5 (MHz) 1 1 1 133.3 33.3 (CPU/4) 1 1 0 124 31 (CPU/4) 1 0 1 150 37.5 (CPU/4) 1 0 0 140 35 (CPU/4) 0 1 1 105 35 (CPU/3) 0 1 0 110 36.7 (CPU/3) 0 0 1 115 38.3 (CPU/3) 0 0 0 120 40 (CPU/3) 1 1 1 100 33.3 (CPU/3) 1 1 0 133.3 44.43 (CPU/3) 1 0 1 112 37.3 (CPU/3) 1 0 0 103 34.3 (CPU/3) 0 1 1 66.8 33.4 (CPU/2) 0 1 0 83.3 41.7 (CPU/2) 0 0 1 75 37.5 (CPU/2) 0 0 0 124 41.3 (CPU/3) Key Specifications CPU Cycle-to-Cycle Jitter: ......................................... 250 ps CPU to CPU Output Skew: ........................................ 175 ps PCI to PCI Output Skew: ............................................ 500 ps VDDQ3: .................................................................... 3.3V±5% VDDQ2: .................................................................... 2.5V±5...