器件名称: W48C111-16
功能描述: Frequency Generator for Integrated Core Logic
文件大小: 115.15KB 共7页
简 介:PRELIMINARY
W48C111-16
Frequency Generator for Integrated Core Logic
Features
Maximized EMI suppression using Cypress’s Spread Spectrum technology Power-on default to spread mode Two copies of CPU output Six copies of PCI output (synchronous w/CPU outputs) One copy of 48-MHz USB output One Buffered copy of 14.318-MHz input reference signal Supports 100-MHz or 66-MHz CPU operation Power management control input pins Low Frequency Test Mode Available in 28-pin SSOP (209 mil) CPU0:1 Skew: ............................................................ 175 ps CPU0:1 Cycle to Cycle Jitter: ..................................... 200 ps PCI_F, PCI1:5 Skew: ...................................................500 ps PCI_F, PCI1:5 Cycle to Cycle Jitter: ............................ 250 ps CPU to PCI Skew: ........................ 1.5 to 4.0 ns (CPU Leads) Output Duty Cycle: .................................................... 45/55% PCI_F, PCI Edge Rate: .............................................. >1 V/ns CPU_STOP#, PWR_DWN#, PCI_STOP#: 250-k pull-up resistor Table 1. Pin Selectable Frequency SEL100/66# 0 1 CPU(0:1) 66.6 MHz 100 MHz PCI 33.3 33.3 Spread% ±0.5% ±0.5%
Key Specifications
Supply Voltages: ....................................... VDDQ3 = 3.3V±5% VDDQ2 = 2.5V±5%
Block Diagram
VDDQ3 REF X1 X2 XTAL OSC PLL Ref Freq
Pin Configuration
X1 X2 GND PCI_F PCI1 VDDQ3
VDDQ2
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
GND VDDQ3 REF VDDQ2 CPU……
