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ICS843034 Datasheet(PDF) 20 Page - Renesas Technology Corp |
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ICS843034 Datasheet(HTML) 20 Page - Renesas Technology Corp |
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20 / 31 page  20 © Integrated Device Technology, Inc December 2, 2015 843034 DATA SHEET 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. The differential outputs 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 transmission lines. Matched impedance techniques should be used to maximize operating frequency and minimize signal distortion. Figures 5A and 5B 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 5A. 3.3V LVPECL Output Termination Figure 5B. 3.3V LVPECL Output Termination R1 84 R2 84 3.3V R3 125 R4 125 Z o = 50 Z o = 50 Input 3.3V 3.3V + _ |
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