AR# 1520: XC2000L/XC3000L/XC4000L: Estimating power consumption for 3.3V Devices (2000L, 3000L, 4000L)
XC2000L/XC3000L/XC4000L: Estimating power consumption for 3.3V Devices (2000L, 3000L, 4000L)
Keywords: power consumption, xc2000, xc3000, xc4000, 3.3V
Description This is a guideline for estimating power consumption for our low voltage (3.3V) devices. For more information regarding estimating power consumption in FPGAs please refer to the 1996 Databook.
Since our 3.3 volt devices have the same architecture as thier 5V counterparts and almost all power (except Icco) is dynamic, the power changes with the square of the supply voltage.
That means, at nominal 3.3 V, the power is 43.6 percent of the power at nominal 5 V. If you use the mac commercial values, 3.6 V and 5.25 V, then it is 47 percent.
Based on this information, the following figures may be used to estimate possible power consumption of a design :