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SY100EP14U Datasheet(PDF) 8 Page - Micrel Semiconductor |
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SY100EP14U Datasheet(HTML) 8 Page - Micrel Semiconductor |
8 / 9 page 8 Precision Edge™ SY100EP14U Micrel TERMINATION RECOMMENDATIONS R2 82 Ω R2 82 Ω ZO = 50Ω ZO = 50Ω +3.3V +3.3V Vt = VCC –2V R1 130 Ω R1 130 Ω +3.3V Figure 1. Parallel Termination–Thevenin Equivalent Note 1. For +2.5V systems: R1 = 250 Ω, R2 = 62.5Ω Note 2. For +5.0V systems: R1 = 82 Ω, R2 = 130Ω Z = 50 Ω Z = 50 Ω 50 Ω 50 Ω 50 Ω +3.3V +3.3V “source”“destination” Rb Figure 2. Three-Resistor “Y–Termination” Note 1. Power-saving alternative to Thevenin termination. Note 2. Place termination resistors as close to destination inputs as possible. Note 3. R b resistor sets the DC bias voltage, equal to Vt. For +3.3V systems Rb = 46Ω to 50Ω. For +5V systems, Rb = 110Ω. +3.3V +3.3V 50 Ω ZO = 50Ω 0.01 µF VBB R2 82 Ω +3.3V +3.3V R1 130 Ω R1 130 Ω R2 82 Ω Vt = VCC –2V Q /Q +3.3V Figure 3. Terminating Unused I/O Note 1. Unused output (/Q) must be terminated to balance the output. Note 2. Micrel's differential I/O logic devices include a V BB reference pin . Note 3. Connect unused input through 50 Ω to V BB. Bypass with a 0.01µF capacitor to VCC, not GND. Note 4. For +2.5V systems: R1 = 250 Ω, R2 = 62.5Ω. |
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