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IDT8N3D085 Datasheet(PDF) 10 Page - Integrated Device Technology |
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IDT8N3D085 Datasheet(HTML) 10 Page - Integrated Device Technology |
10 / 19 page IDT8N3D085 Data Sheet LVPECL DUAL FREQUENCY PROGRAMMBLE CRYSTAL OSCILLATOR IDT8N3D085CCD REVISION A DECEMBER 14, 2012 10 ©2012 Integrated Device Technology, Inc. Parameter Measurement Information, continued Output Duty Cycle/Pulse Width/Period Applications Information Recommendations for Unused Input Pins Inputs: LVCMOS Control Pins All control pins have internal pullups or pulldowns; additional resistance is not required but can be added for additional protection. A 1k resistor can be used. 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 1A and 1B 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 1A. 3.3V LVPECL Output Termination Figure 1B. 3.3V LVPECL Output Termination t PW t PERIOD t PW t PERIOD odc = x 100% nQ Q 3.3V V CC - 2V R1 50 Ω R2 50 Ω RTT Z o = 50Ω Z o = 50Ω + _ RTT = * Z o 1 ((V OH + VOL) / (VCC – 2)) – 2 3.3V LVPECL Input R1 84 Ω R2 84 Ω 3.3V R3 125 Ω R4 125 Ω Z o = 50Ω Z o = 50Ω LVPECL Input 3.3V 3.3V + _ |
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