MOTOROLA

MPC7457 Part Number Specification for the MPC74x7RXnnnnNx Series

5

General Parameters

Table 8 provides the clock AC timing specifications for the MPC7457 part numbers described herein.

Table 8. Clock AC Timing Specifications

At recommended operating conditions. See Table 4.

Characteristic

Symbol

Maximum Processor Core Frequency

Unit

Notes

600 MHz

733 MHz

867 MHz

1000 MHz

Min

Max

Min

Max

Min

Max

Min

Max

Processor frequency

500

600

500

733

500

867

500

1000

MHz

1

VCO frequency

1000

1200

1000

1466

1000

1733

1000

2000

MHz

1

SYSCLK frequency

33

167

33

167

33

167

33

167

MHz

SYSCLK cycle time

6.0

30

6.0

30

6.0

30

6.0

30

ns

Note:

1. Caution: The SYSCLK frequency, PLL_CFG[0:4] settings must be chosen such that the resulting SYSCLK (bus)

frequency, CPU (core) frequency, and PLL (VCO) frequency do not exceed their respective maximum or minimum

operating frequencies. Refer to the PLL_CFG[0:4] signal description in Section 1.9.1, “PLL Configuration,” for valid

PLL_CFG[0:4] settings.

Freescale Semiconductor, Inc.

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