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843751 Arkusz danych(PDF) 11 Page - Renesas Technology Corp |
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843751 Arkusz danych(HTML) 11 Page - Renesas Technology Corp |
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11 / 18 page  843751 Data Sheet FEMTOCLOCK™ SAS/SATA CLOCK GENERATOR 843751 REVISION B 08.21.15 11 ©2015 Integrated Device Technology, Inc. Termination for 2.5V LVPECL Outputs Figure 4A and Figure 5B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to terminating 50 to VCC – 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 4A. 2.5V LVPECL Driver Termination Example Figure 4C. 2.5V LVPECL Driver Termination Example Figure 4B. 2.5V LVPECL Driver Termination Example 2.5V LVPECL Driver VCC = 2.5V 2.5V 2.5V 50 Ω 50 Ω R1 250 Ω R3 250 Ω R2 62.5 Ω R4 62.5 Ω + – 2.5V LVPECL Driver VCC = 2.5V 2.5V 50 Ω 50 Ω R1 50 Ω R2 50 Ω + – 2.5V LVPECL Driver VCC = 2.5V 2.5V 50 Ω 50 Ω R1 50 Ω R2 50 Ω R3 18 Ω + – |
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