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ICS85310AI21N Datasheet(PDF) 11 Page - Integrated Circuit Systems |
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ICS85310AI21N Datasheet(HTML) 11 Page - Integrated Circuit Systems |
11 / 15 page 85310AYI-21 www.icst.com/products/hiperclocks.html REV. D JUNE 30, 2005 11 Integrated Circuit Systems, Inc. ICS85310I-21 LOW SKEW, DUAL, 1-TO-5 DIFFERENTIAL-TO-2.5V/3.3V ECL/LVPECL FANOUT BUFFER 3. Calculations and Equations. LVPECL output driver circuit and termination are shown in Figure 5. To calculate worst case power dissipation into the load, use the following equations which assume a 50 Ω load, and a termination voltage of V CCO - 2V. • For logic high, V OUT = V OH_MAX = V CCO_MAX – 1.0V (V CCO_MAX - V OH_MAX ) = 1.0V • For logic low, V OUT = V OL_MAX = V CCO_MAX – 1.7V (V CCO_MAX - V OL_MAX ) = 1.7V Pd_H = [(V OH_MAX – (V CCO_MAX - 2V))/R L ] * (V CCO_MAX - V OH_MAX ) = [(2V - (V CCO_MAX - V OH_MAX ))/R L ] * (V CCO _MAX - V OH_MAX ) = [(2V - 1V)/50 Ω] * 1V = 20.0mW Pd_L = [(V OL_MAX – (V CCO_MAX - 2V))/R L ] * (V CCO_MAX - V OL_MAX ) = [(2V - (V CCO_MAX - V OL_MAX ))/R L ] * (V CCO_MAX - V OL_MAX ) = [(2V - 1.7V)/50 Ω] * 1.7V = 10.2mW Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW Figure 5. LVPECL DRIVER CIRCUIT AND TERMINATION Q1 V OUT V CCO RL 50 V CCO - 2V |
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