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ICS5314AI11L датащи(PDF) 11 Page - Integrated Circuit Systems |
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ICS5314AI11L датащи(HTML) 11 Page - Integrated Circuit Systems |
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11 / 18 page ![]() 85314AGI-11 www.icst.com/products/hiperclocks.html REV. C MAY 24, 2005 11 Integrated Circuit Systems, Inc. ICS85314I-11 LOW SKEW, 1-TO-5 DIFFERENTIAL-TO-2.5V/3.3V LVPECL FANOUT BUFFER TERMINATION FOR 2.5V LVPECL OUTPUT Figure 5A and Figure 5B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to ter- minating 50 Ω to V CC - 2V. For VCC = 2.5V, the VCC - 2V is very close to ground level. The R3 in Figure 5B can be eliminated and the termination is shown in Figure 5C. FIGURE 5C. 2.5V LVPECL TERMINATION EXAMPLE FIGURE 5B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 5A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE R2 62.5 Zo = 50 Ohm R1 250 + - 2.5V 2,5V LVPECL Driv er R4 62.5 R3 250 Zo = 50 Ohm 2.5V VCC=2.5V R1 50 R3 18 Zo = 50 Ohm Zo = 50 Ohm + - 2,5V LVPECL Driv er VCC=2.5V 2.5V R2 50 2,5V LVPECL Driv er VCC=2.5V R1 50 R2 50 2.5V Zo = 50 Ohm Zo = 50 Ohm + - |
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