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ICS85311AMT Datasheet(PDF) 10 Page - Integrated Circuit Systems |
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ICS85311AMT Datasheet(HTML) 10 Page - Integrated Circuit Systems |
10 / 13 page ICS85311AM www.icst.com/products/hiperclocks.html REV. A JUNE 29, 2001 10 Integrated Circuit Systems, Inc. ICS85311 Low Skew, 1-to-2 Differential-to-2.5V/3.3V ECL/LVPECL Fanout Buffer 3. Calculations and Equations. LVPECL output driver circuit and termination are shown in Figure 9. To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω 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 - 2V))/R L ]*(V CC - V OH_MAX ) Pd_L = [(V OL_MAX (V CC - 2V))/R L ]*(V CC - V OL_MAX ) • For logic high , V OUT = V OH_MAX = V CC 1.0V Using V CC = 3.465, this results in V OH_MAX = 2.465V • For logic low , V OUT = V OL_MAX = V CC 1.7V Using V CC = 3.465, this results in V OL_MAX = 1.765V Pd_H = [(2.465V - (3.465V - 2V))/50 Ω]*(3.465V - 2.465V) = 20.0mW 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 Q1 V OUT V CC RL 50 V CC - 2V Figure 9 - LVPECL Driver Circuit and Termination |
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