MCF54455_08 datasheet(21/48 Pages) FREESCALE

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Electrical Characteristics

MCF5445x ColdFire® Microprocessor Data Sheet, Rev. 2

Freescale Semiconductor

Figure 7. Input Clock Timing Diagram

1 / C1 Frequency

66.66

MHz

Rise time (20% of vdd to 80% of vdd)

Fall time (80% of vdd to 20% of vdd)

Duty cycle (at 50% of vdd)

Table 10. PLL Electrical Characteristics

Num

Characteristic

Symbol

Min.

Value

Max.

Value

Unit

PLL Reference Frequency Range

Crystal reference

External reference

fref_crystal

fref_ext

66.66

MHz

Core/System Frequency

fsys

512 Hz1

266.67 MHz

—

Core/System Clock Period

tsys

—1/fsys

VCO Frequency (fvco = fref × PFDR)

fvco

300

540

MHz

Crystal Start-up Time2, 3

tcst

—10

EXTAL Input High Voltage

Crystal Mode4

All other modes (External, Limp)

VIHEXT

VXTAL + 0.4

EVDD/2 + 0.4

—

EXTAL Input Low Voltage

Crystal Mode4

All other modes (External, Limp)

VILEXT

—

VXTAL - 0.4

EVDD/2 - 0.4

EXTAL Input Rise & Fall Time (20% to 80% EVDD)

(External, Limp)

12ns

7PLL Lock Time 3, 5

tlpll

—

50000

CLKIN

Duty Cycle of reference 3 (External, Limp)

tdc

XTAL Current

IXTAL

Total on-chip stray capacitance on XTAL

CS_XTAL

—1.5

Total on-chip stray capacitance on EXTAL

CS_EXTAL

—1.5

Table 9. Input Clock Timing Requirements (continued)

Item

Specification

Min

Max

Unit

Input Clock (CLKIN)

MCF54455 Datasheet(PDF) 21 Page - Freescale Semiconductor, Inc

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