MC68HC908BD48 Datasheet, PDF(275/290 Page) Freescale Semiconductor, Inc – Microcontrollers

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MC68HC908BD48 Datasheet, PDF (275/290 Pages) Freescale Semiconductor, Inc – Microcontrollers

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Electrical Specifications

Control Timing

21.7 Control Timing

Characteristic

Symbol

Min

Max

Unit

Internal Operating Frequency(2)

RST Input Pulse Width Low(3)

fOP

â

tIRL

50

6

MHz

â

ns

NOTES:

1. VDD = 4.5 to 5.5 Vdc, VSS = 0 Vdc; timing shown with respect to 20% VDD and 70% VDD, unless otherwise noted.

2. Some modules may require a minimum frequency greater than dc for proper operation; see appropriate table for this

information.

3. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.

21.8 Oscillator Characteristics

Characteristic

Symbol

Min

Typ

Max

Unit

Crystal Frequency(1)

fOSCXCLK

â

24

â

MHz

External Clock

Reference Frequency(1), (2)

fOSCXCLK

dc

â

24

MHz

Crystal Load Capacitance(3)

Crystal Fixed Capacitance(3)

Crystal Tuning Capacitance(3)

CL

â

15

â

pF

C1

â

2 Ã CL

â

C2

â

2 Ã CL

â

Feedback Bias Resistor

Series Resistor(3), (4)

RB

â

10

RS

â

â

â

Mâ¦

â

NOTES:

1. The sync processor module is designed to function at fOSCXCLK = 24MHz. The values given here are oscillator specifi-

cations.

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

3. Consult crystal vendor data sheet

4. Not Required for high frequency crystals

MC68HC908BD48 â Rev. 1.0

MOTOROLA

Electrical Specifications

Technical Data

275

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