W48S87-04

PRELIMINARY W48S87-04 Spread Spectrum 3 DIMM Desktop Clock Features Outputs — 4 CPU Clock (2.5V or 3.3V, 50 to 83.3 MHz) — 7 PCI (3.3V) — 1 48-MHz for USB (3.3V) — 1 24-MHz for Super I/O (3.3V) — 2 REF (3.3V) — 1 IOAPIC (2.5V or 3.3V) — 12 SDRAM Serial data interface provides additional frequency selection, individual clock output disable, and other functions Smooth transition supports dynamic frequency assignment Frequency selection not affected during power down/up cycle Supports a variety of power-saving options 3.3V operation Available in 48-pin SSOP (300 mils) Key Specifications ±0.5% Spread Spectrum Modulation: ......................... ±0.5% Jitter (Cycle-to-Cycle): .................................................250 ps Duty Cycle: ................................................................ 45-55% CPU-PCI Skew: ........................................................ 1 to 4 ns PCI-PCI or CPU-CPU Skew: ......................