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ICS8523BGILF Datasheet(PDF) 8 Page - Integrated Circuit Systems |
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ICS8523BGILF Datasheet(HTML) 8 Page - Integrated Circuit Systems |
8 / 16 page 8523BGI www.icst.com/products/hiperclocks.html REV. C SEPTEMBER 16, 2004 8 Integrated Circuit Systems, Inc. ICS8523I LOW SKEW, 1-TO-4 DIFFERENTIAL-TO-HSTL FANOUT BUFFER FIGURE 3C. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY 3.3V LVPECL DRIVER FIGURE 3B. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY 3.3V LVPECL DRIVER FIGURE 3D. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY 3.3V LVDS DRIVER 3.3V R1 50 R3 50 Zo = 50 Ohm LVPECL Zo = 50 Ohm HiPerClockS CLK nCLK 3.3V Input R2 50 Zo = 50 Ohm Input HiPerClockS CLK nCLK 3.3V R3 125 R2 84 Zo = 50 Ohm 3.3V R4 125 LVPECL R1 84 3.3V DIFFERENTIAL CLOCK INPUT INTERFACE The CLK /nCLK accepts LVDS, LVPECL, HSTL, SSTL, HCSL and other differential signals. Both V SWING and VOH must meet the V PP and VCMR input requirements. Figures 3A to 3E show inter- face examples for the HiPerClockS CLK/nCLK input driven by the most common driver types. The input interfaces suggested FIGURE 3A. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY ICS HIPERCLOCKS HSTL DRIVER here are examples only. Please consult with the vendor of the driver component to confirm the driver termination requirements. For example in Figure 3A, the input termination applies for ICS HiPerClockS HSTL drivers. If you are using an HSTL driver from another vendor, use their termination recommendation. 1.8V R2 50 Input LVHSTL Driver ICS HiPerClockS R1 50 LVHSTL 3.3V Zo = 50 Ohm Zo = 50 Ohm HiPerClockS CLK nCLK FIGURE 3E. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY 3.3V LVPECL DRIVER WITH AC COUPLE Zo = 50 Ohm R3 125 HiPerClockS CLK nCLK 3.3V R5 100 - 200 3.3V R2 84 3.3V R6 100 - 200 Input R5,R6 locate near the driver pin. Zo = 50 Ohm R1 84 R4 125 C2 LVPECL C1 Zo = 50 Ohm R1 100 3.3V LVDS_Driv er Zo = 50 Ohm Receiv er CLK nCLK 3.3V |
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