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ICS843251BGI-12T Datasheet(PDF) 9 Page - Integrated Circuit Systems |
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ICS843251BGI-12T Datasheet(HTML) 9 Page - Integrated Circuit Systems |
9 / 12 page 843251BGI-12 www.icst.com/products/hiperclocks.html REV. A JANUARY 10, 2006 9 Integrated Circuit Systems, Inc. ICS843251I-12 FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR PRELIMINARY TERMINATION FOR 2.5V LVPECL OUTPUT Figure 4A 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. FIGURE 4C. 2.5V LVPECL TERMINATION EXAMPLE FIGURE 4B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 4A. 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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