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ICS85211AMI-03T Datasheet(PDF) 7 Page - Integrated Circuit Systems |
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ICS85211AMI-03T Datasheet(HTML) 7 Page - Integrated Circuit Systems |
7 / 13 page 85211AMI-03 www.icst.com/products/hiperclocks.html REV. B APRIL 8, 2003 7 Integrated Circuit Systems, Inc. ICS85211I-03 LOW SKEW, 1-TO-2 DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER CLOCK INPUT INTERFACE The CLK /nCLK accepts differential input signals of both V SWING and V OH to meet the VPP and VCMR input requirements. Figures 3 to 6 show interface examples for the ICS85211I-03 clock input driven by most common driver types. The input interfaces suggested here are examples only. Please consult with the vendor of the FIGURE 3. ICS85211I-03 CLK/NCLK INPUT DRIVEN BY HIPERCLOCKS LVHSTL DRIVER 1.8V R2 50 Input LVHSTL Driver ICS HiPerClockS R1 50 LVHSTL 3.3V Zo = 50 Ohm Zo = 50 Ohm HiPerClockS CLK nCLK driver components to confirm the driver termination requirement. For example in Figure 3, the input termination applies for ICS HiPerClockS LVHSTL drivers. If you are using an LVHSTL driver from another vendor, use their termination recommendation. FIGURE 4. ICS85211I-03 CLK/NCLK INPUT DRIVEN BY 3.3V LVPECL DRIVER (INTERFACE 1) FIGURE 5. ICS85211I-03 CLK/NCLK INPUT DRIVEN BY 3.3V LVPECL DRIVER (INTERFACE 2) 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 FIGURE 6. ICS85211I-03 CLK/NCLK INPUT DRIVEN BY 3.3V LVPECL DRIVER WITH AC COUPLE R3 125 LVPECL R1 84 C1 R2 84 HiPerClockS CLK nCLK R5,R6 loc ate near the driv er pin. Zo = 50 Ohm 3.3V 3.3V C2 R4 125 R6 100-200 Zo = 50 Ohm R5 100-200 3.3V Input |
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