EPF8282AV datasheet(51/62 Pages) ALTERA

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Altera Corporation

FLEX 8000 Programmable Logic Device Family Data Sheet

Power

Consumption

The supply power (P) for FLEX 8000 devices can be calculated with the

following equation:

P = PINT + PIO = [(ICCSTANDBY + ICCACTIVE) × VCC] + PIO

Typical ICCSTANDBY values are shown as ICC0 in Table 11 on page 28 and

Table 15 on page 30. The PIO 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 ICCACTIVE 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

ICCACTIVE:

The parameters in this equation are shown below:

fMAX

= Maximum operating frequency in MHz

= Total number of logic cells used in the device

togLC = Average percentage of logic cells toggling at each clock

= Constant, shown in Table 50

This calculation provides an ICC estimate based on typical conditions

with no output load. The actual ICC 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 ICC and operating frequency

for several LE utilization values.

ICCACTIVE

fMAX N togLC

µA

MHz

----------------------------

Table 50. Values for Constant K

Device

5.0-V FLEX 8000 devices

3.3-V FLEX 8000 devices

EPF8282AV Datasheet(PDF) 51 Page - Altera Corporation