Compatible Systems RISC 2800i Manual de usuario descargar pdf (Pagina 11)

MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5

Freescale Semiconductor 11

Electrical and Thermal Characteristics

Table 4 provides the recommended operating conditions for the MPC7447A.

NOTE

Table 4 describes the nominal operating conditions of the device. For

information regarding the operation of the device at supported derated core

voltage conditions, see Section 5.3, “Voltage and Frequency Derating.”

Table 5 provides the package thermal characteristics for the MPC7447A.

Table 3. Input Threshold Voltage Settings

BVSEL Signal Processor Bus Input Threshold is Relative to: Notes

0 1.8 V 1, 2

¬HRESET

Not available 1

HRESET

2.5 V 1

12.5 V1

Notes:

1. Caution: The input threshold selection must agree with the OV

voltages supplied. See notes in Ta bl e 2 .

2. If used, pull-down resistors should be less than 250 Ω.

Table 4. Recommended Operating Conditions

Characteristic Symbol

Recommended Value

Unit Notes

Minimum Maximum

Core supply voltage V

1.3 V ± 50 mV V 3

PLL supply voltage AV

1.3 V ± 50 mV V 2, 3

Processor bus supply voltage BVSEL = 0 OV

1.8 V ± 5% V

BVSEL = HRESET

or OV

2.5 V ± 5%

Input voltage Processor bus V

GND OV

JTAG signals V

GND OV

Die-junction temperature T

0105°C

Notes:

1. These are the recommended and tested operating conditions. In addition, these devices also support voltage

derating; see Section 5.3, “Voltage and Frequency Derating.” Proper device operation outside of these conditions

and those specified in Section 5.3 is not guaranteed.

2. This voltage is the input to the filter discussed in Section 9.2, “PLL Power Supply Filtering,” and not necessarily the

voltage at the AV

pin, which may be reduced from V

by the filter.

3. V

and AV

may be reduced in order to reduce power consumption if further maximum core frequency

constraints are observed. See Section 5.3, “Voltage and Frequency Derating,” for specific information.

Table 5. Package Thermal Characteristics

Characteristic Symbol Value Unit Notes

Junction-to-ambient thermal resistance, natural convection, single-layer (1s) board R

26 °C/W 2, 3

Junction-to-ambient thermal resistance, natural convection, four-layer (2s2p) board R

JMA

19 °C/W 2, 4

Junction-to-ambient thermal resistance, 200 ft/min airflow, single-layer (1s) board R

JMA

20 °C/W 2, 4

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 55 56

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