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ICS9248YG-192-T Datasheet(PDF) 2 Page - Integrated Circuit Systems |
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ICS9248YG-192-T Datasheet(HTML) 2 Page - Integrated Circuit Systems |
2 / 12 page 2 ICS9248-192 0540E—08/20/03 Pin Descriptions Pin number Pin name Type Description 1 GNDREF Power Ground for 14.318 MHz reference clock outputs 2 X1 Input 14.318 MHz crystal input 3 X2 Output 14.318 MHz crystal output 4PD# Input Asynchronous active low input pin used to power down the device into a low power state. The internal clocks are disabled and the VCO and the crystal are stopped. The latency of the power down will not be greater than 3ms. 12, 11, 10, 7, 6, 5 PCICLK (5:0) Output 3.3V PCI clock outputs, free running selectable 8 GNDPCI Power Ground for PCI clock outputs 9 VDDPCI Power 3.3V power for the PCI clock outputs Sel48_24# Input Selects 24MHz (0) or 48MHz (1) output 24_48MHz Output Selectable output either 24MHz or 48MHz 13 SDATA I/O Data pin for I 2C circuitry 5V tolerant 14 SCLK IN Clock pin of I 2C circuitry 5V tolerant CPU3.3-2.5# Input 3.3 (1) or 2.5 (0) VDD buffer strength selection, has pullup to VDD, nominal 30K resistor. 48MHz Output 3.3V 48 MHz clock output, fixed frequency clock typically used with USB devices 17 GND48 Power Ground for 48 MHz clocks 18 VDD48 Power 3.3V power for 48/24 MHz clocks 19 SEL 66/60# Input Control for the frequency of clocks at the CPU & PCICLK output pins. "0" = 60 MHz. "1" = 66.6 MHz. The PCI clock is multiplexed to run at 33.3 MHz for both selected cases. 20 VDD_Core Power Isolated 3.3V power for core 21 GND_Core Power Isolated ground for core 22 PCI_Stop# Input Synchronous active low input used to stop the PCICLK in active low state. It will not effect PCICLK_F or any other outputs. 23 CPUCLK0 Output CPU clock outputs selectable 2.5V or 3.3V. 24 GNDLCPU Power Ground for CPU clock outputs 25 VDDLCPU Power 2.5V or 3.3V power for CPU clock outputs 26 CPU_STOP# Input Asynchronous active low input pin used to stop the CPUCLK in active low state, all other clocks will continue to run. The CPUCLK will have a "Turnon " latency of at least 3 CPU clocks. 27 REF Output 3.3V 14.318 MHz reference clock output 28 VDDREF Power 3.3V power for 14.318 MHz reference clock outputs. 15 16 |
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