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ICS858012 Scheda tecnica(PDF) 10 Page - Integrated Circuit Systems |
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ICS858012 Scheda tecnica(HTML) 10 Page - Integrated Circuit Systems |
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10 / 15 page ![]() 858012AK www.icst.com/products/hiperclocks.html REV. A NOVEMBER 28, 2005 10 Integrated Circuit Systems, Inc. ICS858012 LOW SKEW, 1-TO-2, DIFFERENTIAL-TO- 2.5V, 3.3V LVPECL FANOUT BUFFER PRELIMINARY TERMINATION FOR 2.5V LVPECL OUTPUT Figure 6A and Figure 6B 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 6B can be eliminated and the termination is shown in Figure 6C. FIGURE 6C. 2.5V LVPECL TERMINATION EXAMPLE FIGURE 6B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 6A. 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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