19

5387B–HIREL–07/05

PC7447A [Preliminary]

6.4.4.6

Minimum Core Frequency Requirements with DFS

In many systems, enabling DFS can result in very low processor core frequencies. However,

care must be taken to ensure that the resulting processor core frequency is within the limits

quencies below the specified minimum f

6.4.5

Power Consumption

Table 7 provides the power consumption for the PC7447A. For information regarding power

Notes:

1.

3mW.

2.

Typical power is an average value measured at the nominal recommended V

running the Dhrystone 2.1 benchmark and achieving 2.3 Dhrystone MIPs/MHz

3. Maximum power is the average measured at nominal V

maximally busy.

4. Doze mode is not a user-definable state; it is an intermediate state between full-power and either nap or sleep mode. As a

result, power consumption for this mode is not tested.

5. Power consumption for these devices is artificially constrained during screening to assure lower power consumption than

other speed grades.

Table 6-6.

Power Consumption for PC7447A

Processor (CPU) Frequency

1000

1167

1267

1420

Unit

Full-Power Mode

Core Power Supply

1.1

1.1

1.3

1.3

1.3

8

9.2

18.3

18

21

W

26

25

30

W

Nap Mode

11.5

13

1.3

1.3

4.1

3.3

4.1

W

Sleep Mode

1.3

1.3

4.1

3.3

4.1

W

Deep Sleep Mode (PLL Disabled)

1.2

1.2

4

3.2

4

W