MPC5553_07 datasheet(20/66 Pages) FREESCALE

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MPC5553 Microcontroller Data Sheet, Rev. 2.0

Electrical Characteristics

Freescale Semiconductor

3.9

Oscillator and FMPLL Electrical Characteristics

Table 12. FMPLL Electrical Specifications

(VDDSYN = 3.0–3.6 V; VSS = VSSSYN = 0.0 V; TA = TL to TH)

Spec

Characteristic

Symbol

Minimum

Maximum

Unit

PLL reference frequency range:

Crystal reference

External reference

Dual controller (1:1 mode)

fref_crystal

fref_ext

fref_1:1

fsys ÷ 2

MHz

System frequency 1

fsys

ICO

(MIN) ÷ 2

RFD

fMAX

MHz

System clock period

tCYC

—1

÷ f

sys

Loss of reference frequency 3

fLOR

100

1000

kHz

Self clocked mode (SCM) frequency 4

fSCM

7.4

17.5

MHz

EXTAL input high voltage

crystal mode 5

All other modes (dual controller (1:1),

bypass, external reference)

VIHEXT

VXTAL + 0.4 V

[(VDDE5 ÷ 2) + 0.4 V]

—

EXTAL input low voltage

crystal mode 6

All other modes (dual controller (1:1),

bypass, external reference)

VILEXT

—

VXTAL – 0.4 V

[(VDDE5 ÷ 2) – 0.4 V]

XTAL current 7

IXTAL

0.8

Total on-chip stray capacitance on XTAL

CS_XTAL

—1.5

Total on-chip stray capacitance on EXTAL

CS_EXTAL

—1.5

Crystal manufacturer’s recommended

capacitive load

Refer to crystal

specification

Refer to crystal

specification

Discrete load capacitance to connect to

EXTAL

CL_EXTAL

—(2

× C

L) – CS_EXTAL

– CPCB_EXTAL

Discrete load capacitance to connect to

XTAL

CL_XTAL

—(2

× C

L) – CS_XTAL –

CPCB_XTAL

PLL lock time9

tlpll

—750

μs

Dual controller (1:1) clock skew

(between CLKOUT and EXTAL) 10, 11

tskew

–2

Duty cycle of reference

tDC

Frequency un-LOCK range

fUL

– 4.0

4.0

% fSYS

Frequency LOCK range

fLCK

– 2.0

2.0

% fSYS

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