MPC8248CZQB datasheet(14/56 Pages) MOTOROLA

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MPC8272 PowerQUICC II™ Family Hardware Speciﬁcations

MOTOROLA

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

Power Dissipation

Table 7 provides preliminary, estimated power dissipation for various conﬁgurations. Note that suitable

thermal management is required to ensure the junction temperature does not exceed the maximum speciﬁed

value. Also note that the I/O power should be included when determining whether to use a heat sink. For a

complete list of possible clock conﬁgurations, refer to Section 7, “Clock Conﬁguration Modes.”

AC Electrical Characteristics

The following sections include illustrations and tables of clock diagrams, signals, and CPM outputs and

inputs for 66.67-/83.33-/100-MHz MPC8272 devices. Note that AC timings are based on a 50-pf load.

Typical output buffer impedances are shown in Table 8.

6.1

CPM AC Characteristics

Table 9 lists CPM output characteristics.

Table 7. Estimated Power Dissipation for Various Conﬁgurations 1

1 Test temperature = 105˚ C)

Bus

(MHz)

CPM

Multiplication

Factor

CPM

(MHz)

CPU

Multiplication

Factor

CPU

(MHz)

PINT(W)

2, 3

2 P

INT = IDD x VDD Watts

3 Values do not include I/O. Add the following estimates for active I/O based on the following bus speeds:

66.7 MHz = 0.35 W (nominal), 0.4 W (maximum)

83.3 MHz = 0.4 W (nominal), 0.5 W (maximum)

100 MHz = 0.5 W (nominal), 0.6 W (maximum)

Vddl 1.5 Volts

Nominal

Maximum

66.67

200

266

0.75

0.8

100

200

300

0.85

0.9

100

200

400

1.05

Table 8. Output Buffer Impedances 1

1 These are typical values at 65˚ C. Impedance may vary by ±25% with process and temperature.

Output Buffers

Typical Impedance (

Ω)

60x bus

Memory controller

Parallel I/O

PCI

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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