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ICS84326AMT Datasheet(PDF) 8 Page - Integrated Circuit Systems |
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ICS84326AMT Datasheet(HTML) 8 Page - Integrated Circuit Systems |
8 / 15 page 84326AM www.icst.com/products/hiperclocks.html REV. A MARCH 10, 2003 8 Integrated Circuit Systems, Inc. ICS84326 CRYSTAL-TO-3.3V LVPECL SERIAL ATTACHED SCSI CLOCK SYNTHESIZER/FANOUT BUFFER PRELIMINARY 2.5V Zo = 50 Ohm R3 18 + - Zo = 50 Ohm 2.5V R2 50 R1 50 2,5V LVPECL Driver R3 250 + - 2.5V 2,5V LVPECL Driver 2.5V Zo = 50 Ohm R4 62.5 R2 62.5 2.5V Zo = 50 Ohm R1 250 2.5V R1 50 R2 50 + - Zo = 50 Ohm 2.5V 2,5V LVPECL Driver Zo = 50 Ohm TERMINATION FOR 2.5V LVPECL OUTPUT 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 3A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 3B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 3C. 2.5V LVPECL TERMINATION EXAMPLE |
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