MPC7455 datasheet(15/64 Pages) FREESCALE

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MPC7455 RISC Microprocessor Hardware Specifications, Rev. 4.1

Freescale Semiconductor

Electrical and Thermal Characteristics

5.2 AC Electrical Characteristics

This section provides the AC electrical characteristics for the MPC7455. After fabrication, functional parts are

sorted by maximum processor core frequency as shown in Section 5.2.1, “Clock AC Specifications,” and tested for

conformance to the AC specifications for that frequency. The processor core frequency is determined by the bus

(SYSCLK) frequency and the settings of the PLL_CFG[0:4] signals. Parts are sold by maximum processor core

frequency; see Section 11, “Ordering Information.”

5.2.1

Clock AC Specifications

Table 8 provides the clock AC timing specifications as defined in Figure 3.

Typical

7.6

1, 3

Deep Sleep Mode (PLL Disabled)

Typical

7.3

1, 3

Notes:

1. These values apply for all valid processor bus and L3 bus ratios. The values do not include I/O supply power (OVDD

and GVDD) or PLL supply power (AVDD). OVDD and GVDD power is system dependent, but is typically <5% of VDD

power. Worst case power consumption for AVDD < 3 mW.

2. Maximum power is measured at nominal VDD (see Table 4) while running an entirely cache-resident, contrived

sequence of instructions which keep the execution units, with or without AltiVec, maximally busy.

3. Typical power is an average value measured at the nominal recommended VDD (see Table 4) and 65°C in a system

while running a typical code sequence.

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.

Table 8. Clock AC Timing Specifications

At recommended operating conditions. See Table 4.

Characteristic

Symbol

Maximum Processor Core Frequency

Unit

Notes

733 MHz

867 MHz

933 MHz

1 GHz

Min

Max

Min

Max

Min

Max

Min

Max

Processor frequency

fcore

500

733

500

867

500

933

500

1000

MHz

VCO frequency

fVCO

1000

1466

1000

1734

1000

1866

1000

2000

MHz

SYSCLK frequency

fSYSCLK

133

MHz

SYSCLK cycle time

tSYSCLK

7.5

SYSCLK rise and fall time

tKR, tKF

—1.0

SYSCLK duty cycle

measured at OVDD/2

tKHKL/

tSYSCLK

Table 7. Power Consumption for MPC7455 (continued)

Processor (CPU) Frequency

Unit

Notes

733 MHz

867 MHz

933 MHz

1 GHz

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