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ICS950812 数据表(PDF) 2 Page - Integrated Circuit Systems |
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ICS950812 数据表(HTML) 2 Page - Integrated Circuit Systems |
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2 / 29 page ![]() 2 ICS950812 0542G—08/21/03 Pin Configuration PIN # PIN NAME PIN TYPE DESCRIPTION 1 VDDREF PWR Ref, XTAL power supply, nominal 3.3V 2 X1 IN Crystal input, Nominally 14.318MHz. 3 X2 OUT Crystal output, Nominally 14.318MHz 4 GND PWR Ground pin. 5 PCICLK_F0 OUT Free running PCI clock not affected by PCI_STOP# . 6 PCICLK_F1 OUT Free running PCI clock not affected by PCI_STOP# . 7 PCICLK_F2 OUT Free running PCI clock not affected by PCI_STOP# . 8 VDDPCI PWR Power supply for PCI clocks, nominal 3.3V 9 GND PWR Ground pin. 10 PCICLK0 OUT PCI clock output. 11 **E_PCICLK1/PCICLK1 I/O Early/Normal PCI clock output latched at power up. 12 PCICLK2 OUT PCI clock output. 13 **E_PCICLK3/PCICLK3 I/O Early/Normal PCI clock output latched at power up. 14 VDDPCI PWR Power supply for PCI clocks, nominal 3.3V 15 GND PWR Ground pin. 16 PCICLK4 OUT PCI clock output. 17 PCICLK5 OUT PCI clock output. 18 PCICLK6 OUT PCI clock output. 19 VDD3V66 PWR Power pin for the 3V66 clocks. 20 GND PWR Ground pin. 21 66MHZ_OUT0/3V66_2 OUT 3.3V 66.66MHz clock output selected via buffered or internal VCO. 22 66MHZ_OUT1/3V66_3 OUT 3.3V 66.66MHz clock output selected via buffered or internal VCO. 23 66MHZ_OUT2/3V66_4 OUT 3.3V 66.66MHz clock output selected via buffered or internal VCO. 24 66MHZ_IN/3V66_5 I/O 3.3V 66.66MHz clock from internal VCO, 66MHZ input to 66MHz output and PCI. 25 *PD# IN 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 1.8ms. 26 VDDA PWR 3.3V power for the PLL core. 27 GND PWR Ground pin. 28 Vtt_PWRGD# IN This 3.3V LVTTL input is a level sensitive strobe used to determine when latch inputs are valid and are ready to be sampled. This is an active low input. |
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