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ICS8523I 数据表(PDF) 9 Page - Integrated Circuit Systems |
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ICS8523I 数据表(HTML) 9 Page - Integrated Circuit Systems |
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9 / 16 page ![]() 8523BGI www.icst.com/products/hiperclocks.html REV. C SEPTEMBER 16, 2004 9 Integrated Circuit Systems, Inc. ICS8523I LOW SKEW, 1-TO-4 DIFFERENTIAL-TO-HSTL FANOUT BUFFER 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 4A to 4F show interface examples for the HiPerClockS PCLK/nPCLK input driven by the most common driver types. The input interfaces suggested here are examples only. If the driver is from another vendor, use their termination recommendation. Please consult with the vendor of the driver component to confirm the driver ter- mination requirements. FIGURE 4A. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY AN OPEN COLLECTOR CML DRIVER FIGURE 4B. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY A BUILT-IN PULLUP CML DRIVER FIGURE 4C. HIPERCLOCKS PCLK/nPCLK INPUT DRIVEN BY A 3.3V LVPECL DRIVER FIGURE 4F. 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 4E. 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 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 PC LK 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 FIGURE 4D. 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 |
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