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ICS843021AGI-01T Datasheet(PDF) 8 Page - Integrated Device Technology |
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ICS843021AGI-01T Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 15 page ICS843021I-01 FEMTOCLOCKS™CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR IDT™ / ICS™ 3.3V , 2.5V LVPECL CLOCK GENERATOR 8 ICS843021AGI-01 REV. A DECEMBER 3, 2007 Termination for 3.3V LVPECL Outputs The clock layout topology shown below is a typical termination for LVPECL outputs. The two different layouts mentioned are recommended only as guidelines. FOUT and nFOUT are low impedance follower outputs that generate ECL/LVPECL compatible outputs. Therefore, terminating resistors (DC current path to ground) or current sources must be used for functionality. These outputs are designed to drive 50 Ω transmission lines. Matched impedance techniques should be used to maximize operating frequency and minimize signal distortion. Figures 3A and 3B show two different layouts which are recommended only as guidelines. Other suitable clock layouts may exist and it would be recommended that the board designers simulate to guarantee compatibility across all printed circuit and clock component process variations. Figure 3A. 3.3V LVPECL Output Termination Figure 3B. 3.3V LVPECL Output Termination V CC - 2V 50 Ω 50 Ω RTT Z o = 50Ω Z o = 50Ω FOUT FIN RTT = Z o 1 ((V OH + VOL) / (VCC – 2)) – 2 3.3V 125 Ω 125 Ω 84 Ω 84 Ω Z o = 50Ω Z o = 50Ω FOUT FIN |
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