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ICS8533AG-01T Datasheet(PDF) 10 Page - Integrated Circuit Systems |
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ICS8533AG-01T Datasheet(HTML) 10 Page - Integrated Circuit Systems |
10 / 13 page 8533AG-01 www.icst.com/products/hiperclocks.html REV. B JULY 16, 2001 10 Integrated Circuit Systems, Inc. ICS8533-01 LOW SKEW, 1-TO-4 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER 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 8. 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. 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 ) Pd_L = [(V OL_MAX – (V CC_MAX - 2V))/R L ] * (V CC_MAX - V OL_MAX ) • For logic high, V OUT = V OH_MAX = V CC_MAX – 1.0V Using V CC_MAX = 3.465, this results in V OH_MAX = 2.465V • For logic low, V OUT = V OL_MAX = V CC_MAX – 1.7V Using V CC_MAX = 3.465, this results in V OL_MAX = 1.765V Pd_H = [(2.465V - (3.465V - 2V))/50 Ω] * (3.465V - 2.465V) = 20mW Pd_L = [(1.765V - (3.465V - 2V))/50 Ω] * (3.465V - 1.765V) = 10.2mW Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW FIGURE 9 - LVPECL DRIVER CIRCUIT AND TERMINATION Q1 V OUT V CC RL 50 V CC - 2V |
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