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ICS9248F-20 PDF预览

ICS9248F-20

更新时间: 2024-11-12 22:15:35
品牌 Logo 应用领域
矽成 - ICSI 晶体外围集成电路光电二极管时钟
页数 文件大小 规格书
11页 342K
描述
Pentium/ProTM System Clock Chip

ICS9248F-20 数据手册

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Integrated  
Circuit  
Systems, Inc.  
ICS9248-20  
TM  
Pentium/Pro System Clock Chip  
General Description  
Features  
•
Generates system clocks for CPU, IOAPIC, PCI, plus  
The ICS9248-20 is a Clock Synthesizer chip for Pentium and  
PentiumPro CPU based Desktop/Notebook systems that will  
provide all necessary clock timing.  
14.314 MHz REF (0:2), USB, and Super I/O  
•
•
Supports single or dual processor systems  
Supports Spread Spectrum modulation for CPU & PCI  
clocks, down spread -0.5%  
Skew from CPU (earlier) to PCI clock (rising edges for  
100/33.3MHz) 1.5 to 4ns  
Two fixed outputs at 48MHz.  
Separate 2.5V and 3.3V supply pins  
2.5V or 3.3V output: CPU, IOAPIC  
3.3V outputs: PCI, REF, 48MHz  
No power supply sequence requirements  
Uses external 14.318MHz crystal, no external load cap  
required for CL=18pF crystal  
Features include four CPU and eight PCI clocks. Three  
reference outputs are available equal to the crystal frequency.  
Additionally, the device meets the Pentium power-up  
stabilization requirement, assuring that CPU and PCI clocks  
are stable within 2ms after power-up.  
•
•
•
•
•
•
•
PD# pin enables low power mode by stopping crystal OSC  
and PLL stages. Other power management features include  
CPU_STOP#, whichstopsCPU(0:3)clocks, andPCI_STOP#,  
which stops PCICLK (0:6) clocks.  
High drive CPUCLK outputs typically provide greater than 1  
V/ns slew rate into 20pF loads. PCICLK outputs typically  
provide better than 1V/ns slew rate into 30pF loads while  
maintaining 50±5%dutycycle.TheREFclockoutputstypically  
provide better than 0.5V/ns slew rates.  
•
48 pin 300 mil SSOP  
The ICS9248-20 accepts a 14.318MHz reference crystal or  
clock as its input and runs on a 3.3V core supply.  
Pin Configuration  
Block Diagram  
48-Pin SSOP  
Power Groups  
Ground Groups  
VDD = Supply for PLL core  
VDD1 = REF (0:2), X1, X2  
VDD2 = PCICLK_F, PCICLK (0:6)  
VDD3 = 48MHz0, 48MHz1  
VDDL1 = IOAPIC (0:1)  
GND = Ground for PLL core  
GND1 = REF (0:2), X1, X2  
GND2 = PCICLK_F, PCICLK (0:6)  
GND3 = 48MHz0, 48MHz1  
GNDL1 = IOAPIC (0:1)  
VDDL2 = CPUCLK (0:3)  
GNDL2 = CPUCLK (0:3)  
Pentium is a trademark on Intel Corporation.  
9248-20 Rev B 12/03/98  
ICS reserves the right to make changes in the device data identified in this  
publication without further notice. ICS advises its customers to obtain the  
latest version of all device data to verify that any information being relied  
upon by the customer is current and accurate.  

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