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ICS853111 датащи(PDF) 9 Page - Integrated Circuit Systems |
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ICS853111 датащи(HTML) 9 Page - Integrated Circuit Systems |
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9 / 13 page ![]() 853111AY www.icst.com/products/hiperclocks.html REV. D JULY 22, 2003 9 Integrated Circuit Systems, Inc. ICS853111 LOW SKEW, 1-TO-10 DIFFERENTIAL-TO-2.5V/3.3V LVPECL/ECL FANOUT BUFFER PRELIMINARY TERMINATION FOR 2.5V LVPECL OUTPUT Figure 3A and Figure 4B 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 4B can be eliminated and the termination is shown in Figure 4C. R2 50 Zo = 50 Ohm VCCO=2.5V R1 50 Zo = 50 Ohm + - 2.5V 2,5V LVPECL Driv er FIGURE 4B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE VCCO=2.5V R1 50 R2 50 Zo = 50 Ohm R3 18 2,5V LVPECL Driv er Zo = 50 Ohm + - 2.5V FIGURE 4A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE R2 62.5 2.5V 2,5V LVPECL Driv er R3 250 Zo = 50 Ohm Zo = 50 Ohm R4 62.5 2.5V + - R1 250 VCCO=2.5V FIGURE 4C. 2.5V LVPECL TERMINATION EXAMPLE |
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