MAC7100 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MAC7100

MAC7100 Microcontroller Family Hardware Specifications

Motorola => Freescale 

Freescale Semiconductor, Inc.

Electrical Characteristics

3.4.1 5 V I/O Pins

The I/O pins operate at a nominal level of 5 V. This class of pins is comprised of the clocks, control and general

purpose/peripheral pins. The internal structure of these pins is identical; however, some functionality may be

disabled (for example, for analog inputs the output drivers, pull-up/down resistors are permanently disabled).

3.4.2 Oscillator Pins

The pins XFC, EXTAL, XTAL are dedicated to the oscillator and operate at a nominal level of 2.5 V.

3.5 Power Dissipation and Thermal Characteristics

Power dissipation and thermal characteristics are closely related. The user must assure that the maximum

operating junction temperature is not exceeded.

Note that the JEDEC specification reserves the symbol RθJA or θJA (Theta-JA) strictly for junction-to-

ambient thermal resistance on a 1s test board in natural convection environment. RθJMA or θJMA

(Theta-JMA) will be used for both junction-to-ambient on a 2s2p test board in natural convection and for

junction-to-ambient with forced convection on both 1s and 2s2p test boards. It is anticipated that the generic

name, θJA, will continue to be commonly used.

The average chip-junction temperature (TJ) in °C is obtained from:

TJ = TA + (ΘJA)

TJ = Junction Temperature (°C)

TA = Ambient Temperature (°C)

PD = Total Chip Power Dissipation (W)

ΘJA = Package Thermal Resistance (°C/W)

The total power dissipation is calculated from:

PD = PINT + PIO

PINT = Chip Internal Power Dissipation (W)

PINT = (IDD × VDD) + (IDDPLL × VDDPLL) + (IDDA × VDDA)

Two cases for PIO, with the internal voltage regulator enabled and disabled, must be considered:

1. Internal Voltage Regulator disabled:

∑ PIO = RDSON ⋅ (IIOi)2

i

PIO is the sum of all output currents on I/O ports associated with VDDX and VDDR.

RDSON

=

V-----O---L-

IOL

(for

outputs

driven

low)

or

RDSON

=

V-----D---D----5-----–----V----O----H--

IOL

(for outputs driven high)

2. Internal voltage regulator enabled:

PINT = (IDDR × VDDR) + (IDDA × VDDA)

IDDR is the current shown in Table 12 and not the overall current flowing into VDDR, which

additionally contains the current flowing into the external loads with output high.

6

MAC7100 Microcontroller Family Hardware Specifications

MOTOROLA

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

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Go to: www.freescale.com

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