Compatible Systems RISC 2800i Bedienungsanleitung PDF herunterladen (Seite 11)

MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4

Freescale Semiconductor 11

Electrical and Thermal Characteristics

Table 4 provides the recommended operating conditions for the MPC7448 part numbers described by this

document; see Section 11.1, “Part Numbers Fully Addressed by This Document,” for more information.

See Section 9.2, “Power Supply Design and Sequencing” for power sequencing requirements.

Table 4. Recommended Operating Conditions

Characteristic Symbol

Recommended Value

Unit Notes

1000 MHz 1420 MHz 1600 MHz 1700 MHz

Min Max Min Max Min Max Min Max

Core supply voltage V

1.15 V ± 50 mV 1.2 V ± 50 mV 1.25 V ± 50 mV 1.3 V +20/

–50mV

V 3, 4, 5

PLL supply voltage AV

1.15 V ± 50 mV 1.2 V ± 50 mV 1.25 V ± 50 mV 1.3 V +20/

–50mV

V 2, 3, 4

Processor

bus

supply

voltage

I/O Voltage Mode = 1.5 V OV

1.5 V ± 5% 1.5 V ± 5% 1.5 V ± 5% 1.5 V ± 5% V 4

I/O Voltage Mode = 1.8 V 1.8 V ± 5% 1.8 V ± 5% 1.8 V ± 5% 1.8 V ± 5% 4

I/O Voltage Mode = 2.5 V 2.5 V ± 5% 2.5 V ± 5% 2.5 V ± 5% 2.5 V ± 5% 4

Input

voltage

Processor bus V

GND OV

JTAG signals V

GND OV

Die-junction temperature T

0 105 0 105 0 105 0 105 •CC6

Notes:

1. These are the recommended and tested operating conditions.

2. This voltage is the input to the filter discussed in Section 9.2.2, “PLL Power Supply Filtering,” and not necessarily the voltage

at the AV

pin, which may be reduced from V

by the filter.

3. Some early devices supported voltage and frequency derating whereby VDD (and AVDD) could be reduced to reduce power

consumption. This feature has been superseded and is no longer supported. See Section 5.3, “Voltage and Frequency

Derating,” for more information.

4. Caution: Power sequencing requirements must be met; see Section 9.2, “Power Supply Design and Sequencing”.

5. Caution: See Section 9.2.3, “Transient Specifications” for information regarding transients on this power supply.

6. For information on extended temperature devices, see Section 11.2, “Part Numbers Not Fully Addressed by This Document.”

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