MPC5510 datasheet(31/54 Pages) FREESCALE

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Electrical Characteristics

MPC5510 Microcontroller Family Data Sheet, Rev. 2

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

2.8

Oscillators Electrical Characteristics

Table 10. 3.3V High Frequency External Oscillator

Num

Characteristic

Symbol

Min.

Value

Max.

Value

Unit

Frequency Range1

1 Since this is an amplitude controlled oscillator the use of overtone oscillators is not recommended. Only use fundamental

frequency oscillators.

fref

2 When PLL frequency modulation is active, reference frequencies less than 8MHz will distort the modulated waveform and the

effects of this on emissions is not characterized.

MHz

Duty Cycle of reference

tdc

EXTAL Input High Voltage

External crystal mode 3

External clock mode

3 This parameter is meant for those who do not use quartz crystals or resonators, but CAN osc, in crystal mode. In that case,

Vextal – Vxtal ≥ 400mV criteria has to be met for oscillator’s comparator to produce output clock.

VIHEXT

VXTAL + 0.4

0.65 x VDDSYN

VDDSYN + 0.3

EXTAL Input Low Voltage

External crystal mode 3

External clock mode

VILEXT

VDDSYN – 0.3

VXTAL – 0.4

0.35 x VDDSYN

XTAL Current 4

4 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

—3

Total On-chip stray capacitance on EXTAL

CS_EXTAL

—3

Crystal manufacturer’s recommended

capacitive load

See crystal

specification

See crystal

specification

Discrete load capacitance to be connected

to EXTAL

CL_EXTAL

—2

×C

L – CS_EXTAL –

CPCB_EXTAL

5 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

×C

L – CS_XTAL –

CPCB_XTAL

Startup Time

tstartup

—10

Table 11. 5V Low Frequency (32 kHz) External Oscillator

Num

Characteristic

Symbol

Min.

Value

Max.

Value

Unit

Frequency Range

fref32

kHz

Duty Cycle of reference

tdc32

XTAL32 Current 1

1 I

xtal32 is the oscillator bias current out of the XTAL32 pin with both EXTAL32 and XTAL32 pins grounded.

IXTAL32

0.5

μA

Crystal manufacturer’s recommended

capacitive load

CL32

See crystal

specification

See crystal

specification

Startup Time

tstartup

—2

MPC5510 Datasheet(PDF) 31 Page - Freescale Semiconductor, Inc

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