器件名称: W48C101
功能描述: Spread Spectrum BX System Frequency Generator
文件大小: 159.6KB 共8页
简 介:W48C101-01
Spread Spectrum BX System Frequency Generator
Features
Maximized EMI suppression using Cypress’s Spread Spectrum technology Four copies of CPU output Eight copies of PCI output (Synchronous w/CPU output) Two copies of 14.318-MHz IOAPIC output Two copies of 48-MHz USB output Three buffered copies of 14.318-MHz reference input Input is a 14.318-MHz XTAL or reference signal Selectable 100-MHz or 66-MHz CPU outputs Power management control input pins Test mode and output three-state capability CPU0:3 Jitter (Cycle to Cycle): ................................... 200 ps CPU0:3 Clock Skew: .................................................. 175 ps PCI_F, PCI1:7 Clock Skew: ........................................ 500 ps CPU to PCI Clock Skew: ..............1.5 to 4.0 ns (CPU Leads) Logic inputs have 250-k: pull-up resistors except SEL100/66#. Table 1. Pin Selectable Frequency SEL 100/66# 0 0 0 0 1 1 1 1 SEL1 0 0 1 1 0 0 1 1 SEL0 0 1 0 1 0 1 0 1 CPU PCI (MHz) (MHz) HI-Z 66.6 66.6 66.6 X1/2 100 100 100 HI-Z 33.3 33.3 33.3 X1/6 33.3 33.3 33.3 SPREAD#=0 Don’t Care ±0.9% Center –1% Down –0.5% Down Don’t Care ±0.9% Center –1% Down –0.5% Down
Key Specifications
Supply Voltages:........................................VDDQ3 = 3.3V±5% ............................................................................................... VDDQ2 = 2.5V±5% or 3.3V±5%
Rev 1.0, November 28, 2006
2200 Laurelwood Road, Santa Clara, CA 95054 Tel:(408) 855-0555 Fax:(408) 855-0550
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