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ICS889831 Datasheet(PDF) 9 Page - Integrated Circuit Systems |
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ICS889831 Datasheet(HTML) 9 Page - Integrated Circuit Systems |
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9 / 18 page ![]() 889831AK www.icst.com/products/hiperclocks.html REV. A JUNE 16, 2005 9 Integrated Circuit Systems, Inc. ICS889831 LOW SKEW, 1-TO-4 DIFFERENTIAL LVPECL-TO-LVPECL/ECL FANOUT BUFFER TERMINATION FOR 2.5V LVPECL OUTPUTS Figure 3A and Figure 3B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to terminat- ing 50 Ω to V CC - 2V. For VCC = 2.5V, the VCC - 2V is very close to ground level. The R3 in Figure 3B can be eliminated and the termination is shown in Figure 3C. FIGURE 3C. 2.5V LVPECL TERMINATION EXAMPLE FIGURE 3B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 3A. 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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