MPC5674F datasheet(38/132 Pages) FREESCALE

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MPC5674F Microcontroller Data Sheet, Rev. 6

Electrical Characteristics

Freescale Semiconductor

Table 19. Oscillator Electrical Specifications1

(VDDSYN = 3.0 V to 3.6 V, VSS =VSSSYN =0 V, TA =TL to TH)

1 All values given are initial design targets and subject to change.

Spec

Characteristic

Symbol

Min

Max

Unit

Crystal Mode Differential Amplitude2

(Min differential voltage between EXTAL and XTAL)

2 This parameter is meant for those who do not use quartz crystals or resonators, but instead use CAN oscillators in crystal mode.

In that case, Vextal –Vxtal ≥ 400 mV criterion has to be met for oscillator’s comparator to produce output clock.

Vcrystal_diff_amp

| Vextal – Vxtal |

>0.4 V

—V

Crystal Mode: Internal Differential Amplifier Noise

Rejection

crystal_diff_amp_nr

—

| Vextal – Vxtal |

<0.2 V

EXTAL Input High Voltage

Bypass mode, External Reference

VIHEXT

((VDD33/2) + 0.4 V)

—V

EXTAL Input Low Voltage

Bypass mode, External Reference

VILEXT

—

(VDD33/2) – 0.4 V

XTAL Current3

3 I

xtal is the oscillator bias current out of the XTAL pin with both EXTAL and XTAL pins grounded.

IXTAL

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

See crystal spec

Discrete load capacitance to be connected to EXTAL

CL_EXTAL

—

(2 × CL –CS_EXTAL

–CPCB_EXTAL

)

4 C

PCB_EXTAL and CPCB_XTAL are the measured PCB stray capacitances on EXTAL and XTAL, respectively.

Discrete load capacitance to be connected to XTAL

CL_XTAL

—

(2 × CL –CS_XTAL

–CPCB_XTAL

)

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