EPM3256ATI144-10 Datasheet, PDF (39/46 Pages) Altera Corporation – Programmable Logic Device Family

Power
Consumption
Altera Corporation
MAX 3000A Programmable Logic Device Family Data Sheet
Supply power (P) versus frequency (f_MAX, in MHz) for MAX 3000A
devices is calculated with the following equation:
P = P_INT + P_IO = I_CCINT × V_CC + P_IO
The P_IO value, which depends on the device output load characteristics
and switching frequency, can be calculated using the guidelines given in
Application Note 74 (Evaluating Power for Altera Devices).
The I_CCINT value depends on the switching frequency and the application
logic. The I_CCINT value is calculated with the following equation:
I_CCINT =
(A × MC_TON) + [B × (MC_DEV – MC_TON)] + (C × MC_USED × f_MAX × tog_LC)
The parameters in the I_CCINT equation are:
MC_TON = Number of macrocells with the Turbo Bit^TM option turned
on, as reported in the Quartus II or MAX+PLUS II Report
File (.rpt)
MC_DEV = Number of macrocells in the device
MC_USED = Total number of macrocells in the design, as reported in
the RPT File
f_MAX
tog_LC
= Highest clock frequency to the device
= Average percentage of logic cells toggling at each clock
(typically 12.5%)
A, B, C = Constants (shown in Table 26)
Table 26. MAX 3000A I_CC Equation Constants
Device
EPM3032A
EPM3064A
EPM3128A
EPM3256A
EPM3512A
A
B
0.71
0.30
0.71
0.30
0.71
0.30
0.71
0.30
0.71
0.30
C
0.014
0.014
0.014
0.014
0.014
The I_CCINT calculation provides an I_CC estimate based on typical
conditions using a pattern of a 16–bit, loadable, enabled, up/down
counter in each LAB with no output load. Actual I_CC should be verified
during operation because this measurement is sensitive to the actual
pattern in the device and the environmental operating conditions.
Figures 12 and 13 show the typical supply current versus frequency for
MAX 3000A devices.
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