器件名称: W254B
功能描述: 133-MHz Spread Spectrum FTG for Mobile Pentium
文件大小: 254.9KB 共17页
简 介:W254B
133-MHz Spread Spectrum FTG for Mobile Pentium III Platforms
Features
Maximized EMI suppression using Cypress’s Spread Spectrum technology (–0.5% and ±0.5%) Single chip system FTG for Mobile Intel Platforms Two CPU outputs Seven copies of PCI clock (one Free Running) Seven SDRAM clock (one DCLK for Memory Hub) Two copies of 48-MHz clock (non-spread spectrum) optimized for USB reference input and video DOT clock Three 3V66 Hublink/AGP outputs One VCH clock (48-MHz non-SSC or 66.67-MHz SSC) One APIC outputs One buffered reference output Supports frequencies up to 133 MHz SMBus interface for programming Power management control inputs APIC, 48-MHz, 3V66, PCI Outputs Cycle-to-Cycle Jitter: ...................................................500 ps CPU Output Skew: ......................................................150 ps 3V66 Output Skew: .....................................................175 ps APIC, SDRAM Output Skew: ......................................250 ps PCI Output Skew:........................................................500 ps VDDQ3 (REF, PCI, 3V66, 48 MHz, SDRAM): ......... 3.3V±5% VDDQ2 (CPU, APIC):....... 2.5V±5%in Selectable Frequency Table 1. Pin Selectable Frequency Input Address FS1 FS0 0 0 0 1 1 0 1 1 Output Frequencies CPU SDRAM 48MHz PCI APIC REF 3V66 66 100 48 33 14.318 66 100 100 MHz MHz MHz MHz 133 133 133 100
Key Specifications
CPU, SDRAM Outputs Cycle-to-Cycle Jitter:.............. 250 ps
Block Diagram
X1 X2
Pin Configurati……
