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ICS853014 датащи(PDF) 10 Page - Integrated Circuit Systems |
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ICS853014 датащи(HTML) 10 Page - Integrated Circuit Systems |
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10 / 17 page ![]() 853014BG www.icst.com/products/hiperclocks.html REV. C MAY 13, 2005 10 Integrated Circuit Systems, Inc. ICS853014 LOW SKEW, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-LVPECL/ECL FANOUT BUFFER LVPECL CLOCK INPUT INTERFACE The PCLKx /nPCLKx accepts LVPECL, CML, SSTL and other differential signals. Both V SWING and VOH must meet the VPP and V CMR input requirements. Figures 5A to 5E show interface examples for the HiPerClockS PCLKx/nPCLKx input driven by the most common driver types. The input interfaces sug- gested here are examples only. If the driver is from another vendor, use their termination recommendation. Please con- sult with the vendor of the driver component to confirm the driver termination requirements. FIGURE 5A. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY A CML DRIVER FIGURE 5B. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY AN SSTL DRIVER FIGURE 5C. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY A 3.3V LVPECL DRIVER FIGURE 5D. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY A 3.3V LVDS DRIVER HiPerClockS PCLK nPCLK PCLK/nPCLK 3.3V R2 50 R1 50 3.3V Zo = 50 Ohm CML 3.3V Zo = 50 Ohm PCLK/nPCLK 2.5V Zo = 60 Ohm SSTL HiPerClockS PCLK nPCLK R2 120 3.3V R3 120 Zo = 60 Ohm R1 120 R4 120 2.5V FIGURE 5E. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY A 3.3V LVPECL DRIVER WITH AC COUPLE 3.3V R5 100 - 200 3.3V 3.3V HiPerClockS PCLK nPCLK R1 125 PCLK/nPCLK R2 125 R3 84 C1 C2 Zo = 50 Ohm R4 84 Zo = 50 Ohm R6 100 - 200 3.3V LVPECL 3.3V HiPerCloc kS PCLK nPCLK R2 84 R3 125 Input Zo = 50 Ohm R4 125 R1 84 LVPECL 3.3V 3.3V Zo = 50 Ohm C2 R2 1K R5 100 Zo = 50 Ohm 3.3V 3.3V C1 R3 1K LVDS R4 1K HiPerClockS PCLK nPCLK R1 1K Zo = 50 Ohm 3.3V PC L K/n PCL K |
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