EPF8282ALC84-4 Datasheet, PDF (51/62 Pages) Altera Corporation – Programmable Logic Device Family

Power
Consumption
FLEX 8000 Programmable Logic Device Family Data Sheet
The supply power (P) for FLEX 8000 devices can be calculated with the
following equation:
P = P_INT + P_IO = [(I_CCSTANDBY + I_CCACTIVE) × V_CC] + P_IO
Typical I_CCSTANDBY values are shown as I_CC0 in Table 11 on page 28 and
Table 15 on page 30. 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_CCACTIVE value depends on the switching frequency and
the application logic. This value can be calculated based on the amount of
current that each LE typically consumes.
The following equation shows the general formula for calculating
I_CCACTIVE:
I_CCACTIVE = K × f_MAX × N × tog_LC × _M------_H----^µ--_z--^A--_×-----_L----_E--
The parameters in this equation are shown below:
f_MAX = Maximum operating frequency in MHz
3
N
= Total number of logic cells used in the device
tog_LC = Average percentage of logic cells toggling at each clock
K
= Constant, shown in Table 50
Table 50. Values for Constant K
Device
K
5.0-V FLEX 8000 devices
75
3.3-V FLEX 8000 devices
60
This calculation provides an I_CC estimate based on typical conditions
with no output load. The actual I_CC value should be verified during
operation because this measurement is sensitive to the actual pattern in
the device and the environmental operating conditions.
Figure 20 shows the relationship between I_CC and operating frequency
for several LE utilization values.
Altera Corporation
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