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ICS5310AI31L датащи(PDF) 9 Page - Integrated Circuit Systems |
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ICS5310AI31L датащи(HTML) 9 Page - Integrated Circuit Systems |
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9 / 16 page ![]() 85310AYI-31 www.icst.com/products/hiperclocks.html REV. D JULY 6, 2005 9 Integrated Circuit Systems, Inc. ICS85310I-31 LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER TERMINATION FOR 2.5V LVPECL OUTPUTS 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 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 |
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