W150

PRELIMINARY W150 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 Three copies of CPU output Seven copies of PCI output One 48-MHz output for USB / One 24-MHz for SIO Two buffered reference outputs Two IOAPIC outputs 17 SDRAM outputs provide support for 4 DIMMs Supports frequencies up to 150 MHz I2C™ interface for programming Power management control inputs Table 1. Mode Input Table Mode 0 1 Table 2. Pin Selectable Frequency Input Address FS3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 FS2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 FS1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 [1] Pin 3 PCI_STOP# REF0 FS0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 CPU_F, 1:2 (MHz) 133.3 124 150 140 105 110 115 120 100 133.3 112 103 66.8 83.3 75 124 PCI_F, 0:5 (MHz) 33.3 (CPU/4) 31 (CPU/4) 37.5 (CPU/4) 35 (CPU/4) 35 (CPU/3) 36.7 (CPU/3) 38.3 (CPU/3) 40 (CPU/3) 33.3 (CPU/3) 44.43 (CPU/3) 37.3 (CPU/3) 34.3 (CPU/3) 33.4 (CPU/2) 41.7 (CPU/2) 37.5 (CPU/2) 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 SDRAMIN to SDRAM0:15 Delay: ..........................3.7 ns typ. VDDQ3: .................................................................... 3.3V±5% VDDQ2: .............