MC908QT4MPE datasheet(158/184 Pages) FREESCALE

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Electrical Specifications

MC68HC908QY/QT Family Data Sheet, Rev. 5

158

Freescale Semiconductor

16.12 3-V Oscillator Characteristics

Figure 16-8. RC versus Frequency (3 Volts @ 25°C)

Characteristic

Symbol

Min

Typ

Max

Unit

Internal oscillator frequency(1)

1. Bus frequency, fOP, is oscillator frequency divided by 4.

fINTCLK

—12.8

—

MHz

Deviation from trimmed Internal oscillator (2)(3)

12.8 MHz, fixed voltage, fixed temp

12.8 MHz, VDD ± 10%, 0 to 70°C

12.8 MHz, VDD ± 10%, –40 to 125°C

2. Deviation values assumes trimming @25°C and midpoint of voltage range.

3. Values are based on characterization results, not tested in production.

ACCINT

—

± 0.4

± 2

—

± 5

Crystal frequency, XTALCLK(1)

fOSCXCLK

1—

MHz

External RC oscillator frequency, RCCLK (1)

fRCCLK

2—

MHz

External clock reference frequency(1) (4)

4. No more than 10% duty cycle deviation from 50%

fOSCXCLK

—

MHz

Crystal load capacitance(5)

5. Consult crystal vendor data sheet

—20—

Crystal fixed capacitance(3)

—

2 x CL

——

Crystal tuning capacitance(3)

—

2 x CL

——

Feedback bias resistor

0.5

Ω

RC oscillator external resistor

REXT

See Figure 16-8

—

Crystal series damping resistor

fOSCXCLK = 1 MHz

fOSCXCLK = 4 MHz

fOSCXCLK = > 8 MHz

—

Ω

3040

5060

EXT (kΩ)

3 V 25°C

MC908QT4MPE Datasheet(PDF) 158 Page - Freescale Semiconductor, Inc

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