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ICS94222

Programmable System Frequency Generator for PII/III™

ICS94222 PDF File

Description

Integrated Circuit Systems, Inc.
ICS94222 Advance Information Programmable System Frequency Generator for PII/III™ Recommended Application: BX, Appollo Pro 133 type of chip set.
Output Features: • 3 - CPUs @2.
5V, up to 166MHz.
• 17 - SDRAM @ 3.
3V, up to 166MHz.
• 7 - PCI @3.
3V • 2 - IOAPIC @ 2.
5V • 1 - 48MHz, @3.
3V fixed.
• 1 - 24MHz @ 3.
3V • 2 - REF @3.
3V, 14.
318MHz.
Features: • Programmable ouput frequency.
• Programmable ouput rise/fall time.
• Programmable PCI_F and PCICLK skew.
• Spread spectrum for EMI control typically by 7dB to 8dB, with programmable spread percentage.
• Watchdog timer technology to reset system if over-clocking causes malfunction.
• Uses external 14.
318MHz crystal.
• FS pins for frequency select Key Specifications: • CPU – CPU: <175ps • SDRAM - SDRAM: <500ps • PCI – PCI: <500ps • CPU-SDRAM: <500ps • CPU(early)-PCI: Min=1.
0ns, Typ=2.
0ns, Max=4.
0ns Pin Configuration AVDD *FS2/REF1 *PCI_STOP#/REF0 GND X1 X2 VDD *MODE/PCICLK_F *FS3/PCICLK0 GND PCICLK1 PCICLK2 PCICLK3 PCICLK4 VDD PCICLK5 BUFFERIN SDRAM11 SDRAM10 VDD SDRAM9 SDRAM8 GND SDRAM15 SDRAM14 GND SDATA SCLK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 VDDL IOAPIC0 IOAPIC_F GND CPUCLK_F CPUCLK0 VDDL CPUCLK1 GND CLK_STOP* SDRAM_F VDDSDR SDRAM0 SDRAM1 GND SDRAM2 SDRAM3 SDRAM4 SDRAM5 VDD SDRAM6 SDRAM7 GND SDRAM12 SDRAM13 AVDD48 24MHz/FS0* 1 48MHz/FSI* 56-Pin SSOP * Internal Pull-up Resistor of 240K to 3.
3V on indicated inputs Functionality Block Diagram PLL2 ÷2 ICS94222 CPU (MHz) 80.
00 75.
00 83.
31 66.
9 103.
00 112.
01 68.
01 100.
7 120.
00 114.
99 109.
99 105.
00 140.
00 150.
00 124.
00 133.
9 48MHz 24MHz IOAPIC_F FS3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 FS2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 FS1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 FS0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 X1 X2 XTAL OSC STOP IOAPIC0 2 REF [1:0] CPUCLK_F CPUCLK (1:0) PLL1 Spread Spectrum FS (3:0) MODE POR LATCH PCI CLOCK DIVDE...

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