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ICS85310AYI-21LN Datasheet(PDF) 8 Page - Integrated Circuit Systems |
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ICS85310AYI-21LN Datasheet(HTML) 8 Page - Integrated Circuit Systems |
8 / 15 page 85310AYI-21 www.icst.com/products/hiperclocks.html REV. D JUNE 30, 2005 8 Integrated Circuit Systems, Inc. ICS85310I-21 LOW SKEW, DUAL, 1-TO-5 DIFFERENTIAL-TO-2.5V/3.3V ECL/LVPECL 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 R2 50 Zo = 50 Ohm VCCO=2.5V R1 50 Zo = 50 Ohm + - 2.5V 2,5V LVPECL Driv er FIGURE 3B. 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 3A. 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 |
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