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ICS8535BKI-01LF Datasheet(PDF) 11 Page - Integrated Device Technology |
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ICS8535BKI-01LF Datasheet(HTML) 11 Page - Integrated Device Technology |
11 / 16 page IDT™ / ICS™ 3.3V LVPECL FANOUT BUFFER 11 ICS8535BGI-01 REV. A NOVEMBER 9, 2007 ICS8535BI-01 LOW SKEW, 1-to-4 LVCMOS/LVTTL-TO-3.3V LVPECL FANOUT BUFFER PRELIMINARY 3. Calculations and Equations. The purpose of this section is to derive the power dissipated into the load. LVPECL output driver circuit and termination are shown in Figure 4. 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 CC - 2V. • For logic high, V OUT = V OH_MAX = V CC_MAX – 0.9V (V CC_MAX - V OH_MAX ) = 1.0V • For logic low, V OUT = V OL_MAX = V CC_MAX – 1.7V (V CC_MAX - V OL_MAX ) = 1.7V Pd_H is power dissipation when the output drives high. Pd_L is the power dissipation when the output drives low. Pd_H = [(V OH_MAX – (V CC_MAX - 2V))/R L ] * (V CC_MAX - V OH_MAX ) = [(2V - (V CC_MAX - V OH_MAX ))/R L ] * (V CC_MAX - V OH_MAX ) = [(2V - 0.9V)/50 Ω] * 0.9V = 19.8mW Pd_L = [(V OL_MAX – (V CC_MAX - 2V))/R L ] * (V CC_MAX - V OL_MAX ) = [(2V - (V CC_MAX - V OL_MAX ))/R L ] * (V CC_MAX - V OL_MAX ) = [(2V - 1.7V)/50 Ω] * 1.7V = 10.2mW Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW FIGURE 4. LVPECL DRIVER CIRCUIT AND TERMINATION Q1 V OUT V CC RL 50 V CC - 2V |
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