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ICS85301 Fiches technique(PDF) 9 Page - Integrated Circuit Systems |
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ICS85301 Fiches technique(HTML) 9 Page - Integrated Circuit Systems |
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9 / 19 page ![]() 85301AK www.icst.com/products/hiperclocks.html REV. A JANUARY 16, 2006 9 Integrated Circuit Systems, Inc. ICS85301 2:1 DIFFERENTIAL-TO-LVPECL MULTIPLEXER LVPECL CLOCK INPUT INTERFACE The PCLK /nPCLK accepts LVPECL, CML, SSTL and other differential signals. Both V SWING and VOH must meet the VPP and V CMR input requirements. Figures 2A to 2F show inter- face examples for the HiPerClockS PCLK/nPCLK 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 2A. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY AN OPEN COLLECTOR CML DRIVER FIGURE 2B. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY A BUILT-IN PULLUP CML DRIVER FIGURE 2C. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY A 3.3V LVPECL DRIVER FIGURE 2F. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY A 3.3V LVDS DRIVER 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 2E. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY AN SSTL DRIVER HiPerClockS PCLK nPCLK PCLK/nPCLK 3.3V R2 50 R1 50 3.3V Zo = 50 Ohm CML 3.3V Zo = 50 Ohm 3.3V HiPerClockS PCLK nPCLK R2 84 R3 125 Input Zo = 50 Ohm R4 125 R1 84 LVPECL 3.3V 3.3V Zo = 50 Ohm FIGURE 2D. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY A 3.3V LVPECL DRIVER WITH AC COUPLE 3.3V 3.3V CML Built-In Pullup R1 100 PCLK nPCLK HiPerClockS PCLK/nPCLK Zo = 50 Ohm Zo = 50 Ohm R2 50 Zo = 50 Ohm C1 R1 50 C2 PC L K /n PC LK R5 100 - 200 Zo = 50 Ohm R6 100 - 200 PCLK nPCLK VBB 3.3V LVPECL 3.3V 3.3V LVDS 3.3V Zo = 50 Ohm 3.3V PCLK nPCLK VBB R2 1K C2 R1 1K R5 100 C1 PC L K/n PC L K Zo = 50 Ohm |
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