器件名称: W137HT
功能描述: FTG for Mobile 440BX & Transmeta
文件大小: 131.55KB 共8页
简 介:W137
FTG for Mobile 440BX & Transmeta’s Crusoe CPU
Features
Maximized EMI suppression using Cypress’s Spread Spectrum Technology Two copies of CPU output Six copies of PCI output (Synchronous w/CPU output) One 48-MHz output for USB support One selectable 24 /48 MHz output Two Buffered copies of 14.318 MHz input reference signal Supports 100 MHz or 66 MHz CPU operation Power management control input pins Available in 28-pin SSOP (209 mils) and 28-pin TSSO (173 mils) SS function can be disabled See W40S11-02 for 2 SDRAM DIMM support CPU0:1 Cycle to Cycle Jitter: ..................................... 200 ps PCI_F, PCI1:5 Output to Output Skew:....................... 500 ps PCI_F, PCI1:5 Cycle to Cycle Jitter: .......................... 250 ps CPU to PCI Output Skew:................1.5–4.0 ns (CPU Leads) Output Duty Cycle:..................................................... 45/55% PCI_F, PCI Edge Rate: .............................................. >1 V/ns CPU_STOP#, OE, SPREAD#, SEL48#, PCI_STOP#, PWR_DWN# all have a 250-kW pull-up resistor. Table 1. Pin Selectable Frequency SEL100/66# 0/1 0 1 OE 0 1 1 CPU Hi-Z 66.6 MHz 100 MHz PCI Hi-Z 33.3 33.3 Spread% Don’t Care See Table 2 See Table 2
Key Specifications
Supply Voltages:........................................ VDDQ3 = 3.3V±5% VDDQ2 = 2.5V±5% CPU0:1 Output to Output Skew: ................................. 175 ps
Table 2. Spread Spectrum Feature SPREAD# 0 1 Spread Profile –0.5% (down spread) 0% (spread disabled)
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