Translation - Japanese: SRAMのIO電力 - Community Translated (JA)
Does the datasheet provide sum of core power and IO power? How do I calculate the IO power in SRAMs?
Assuming capacitive load only, IO power can be estimated to be ((α)* f *N * CL* V * V)
α is called the activity factor ; if on an average half the IO's switch per clock cycle, then α is 0.5.
f is the switching frequency or clock frequency
N is the number of IO's
CL is the capacitive load;
V is the Voltage swing of the IO.
For example: IO power for (CYD18S36V18) = (10MHz * 36 * 20pF * 3.3^2)/2 = 39.2mW.
More information can be obtained from this Application Note: http://www.cypress.com/?rID=12896