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ICS950220 Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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ICS950220 Datasheet(HTML) 1 Page - Integrated Circuit Systems |
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1 / 20 page  Integrated Circuit Systems, Inc. ICS950220 0467F—07/28/05 Block Diagram Pin Configuration Recommended Application: CK-408 clock for Intel ® 845 chipset. Output Features: • 3 - Pairs of differential CPU clocks @ 3.3V • 3 - 3V66 @ 3.3V • 9 - PCI @ 3.3V • 2 - 48MHz @ 3.3V fixed • 1 - 24_48MHz @ 3.3V, 48MHz, 24Mhz or 66MHz • 1 - REF @ 3.3V, 14.318MHz Features/Benefits: • Programmable output frequency. • Programmable output divider ratios. • Programmable output rise/fall time. • Programmable output skew. • Programmable spread percentage for EMI control. • Watchdog timer technology to reset system if system malfunctions. • Programmable watch dog safe frequency. • Support I 2C Index read/write and block read/write operations. • Uses external 14.318MHz crystal. Key Specifications: • CPU Output Jitter <150ps • 3V66 Output Jitter <250ps • CPU Output Skew <100ps Programmable Timing Control Hub™ for P4™ 1. These outputs have 2X drive strength. * Internal Pull-up resistor of 120K to VDD ** these inputs have 120K internal pull-down to GND 48-Pin 300-mil SSOP Power Groups VDDA = Analog Core PLL VDDREF = REF, Xtal AVDD48 = 48MHz 4 S F3 S F2 S F1 S F0 S F K L C U P C z H M 6 6 V 3 z H M K L C I C P z H M 000 0 1 0 0 . 0 0 17 6 . 6 63 3 . 3 3 10 0 0 1 3 3 . 3 3 17 6 . 6 63 3 . 3 3 111 1 0 7 6 . 6 67 6 . 6 64 3 . 3 3 111 1 1 0 0 . 0 0 27 6 . 6 63 3 . 3 3 Frequency Table For additional frequency selections please refer to Byte 0. PLL2 PLL1 Spread Spectrum 48MHz_USB PCICLK (6:0) 48MHz_DOT 3V66_0/24_48MHZ# X1 X2 XTAL OSC CPU DIVDER PCI DIVDER WDEN SEL24_48 MULTSEL0 SDATA SCLK Vtt_PWRGD# PD# FS (4:0) I REF Control Logic Config. Reg. REF 3 7 3 3V66 (3:1) 3V66 /2 DIVDER 3 CPUCLKT (2:0) CPUCLKC (2:0) Reset# VDDREF X1 X2 GND *FS0/PCICLK7 **FS1/PCICLK8 VDDPCI GND *WDEN/PCICLK0 PCICLK1 PCICLK2 PCICLK3 VDDPCI GND PCICLK4 PCICLK5 PCICLK6 VDD3V66 GND 3V66_1 3V66_2 3V66_3 #RESET VDDA 1 1 1 REF/FS2** CPUCLKT0 CPUCLKC0 VDDCPU CPUCLKT1 CPUCLKC1 GND VDDCPU CPUCLKT2 CPUCLKC2 MULTISEL0* I REF GND 48MHz_USB/FS3** 48MHz_DOT/SEL_24_48* AVDD48 GND 3V66_0/24_48MHZ#/FS4** VDD3V66 GND SCLK SDATA Vtt_PWRGD/PD#* GND 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 |
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