SNAS636C December 2013 – July 2021 LMK00338
The current consumption values specified in the Electrical Characteristics table can be used to calculate the total power dissipation and IC power dissipation for any device configuration. The total VCC core supply current (ICC_TOTAL) can be calculated using Equation 5:
Because the output supplies (VCCOA, VCCOB, VCCOC) can be powered from 3 independent voltages, the respective output supply currents (ICCO_BANK_A, ICCO_BANK_B, and ICCO_CMOS) should be calculated separately. ICCO_BANK for either Bank A or B can be directly taken from the corresponding output supply current spec (ICCO_HCSL) provided the output loading matches the specified conditions. Otherwise, ICCO_BANK should be calculated as follows:
Table 9-1 shows the typical IBANK_BIAS values and IOUT_LOAD expressions for HCSL.
Once the current consumption is calculated for each supply, the total power dissipation (PTOTAL) can be calculated as:
If the device configuration is configured with HCSL outputs, then it is also necessary to calculate the power dissipated in any termination resistors (PRT_HCSL). The external power dissipation values can be calculated as follows:
Finally, the IC power dissipation (PDEVICE) can be computed by subtracting the external power dissipation values from PTOTAL as follows: