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MC141531 Datasheet(PDF) 7 Page - Motorola, Inc |
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MC141531 Datasheet(HTML) 7 Page - Motorola, Inc |
7 / 25 page 3–145 MC141531 MOTOROLA Figure 1. Internal Oscillator Frequency Relationship with External Resistor Value 100k 500k 1.0M 1.5M 2.0M Resistor Value between OSC1 and OSC2 ( Ω) Oscillation Frequency (Hz) 260k 90k 70k 50k 30k 10k 280k AC ELECTRICAL CHARACTERISTICS (TA=25˚C, Voltage referenced to VSS, AVDD=DVDD=3V) Note: FFRM = FOSC / 640 FANN = FOSC / 1280 Symbol Parameter Test Condition Min Typ Max Unit FOSC Oscillation Frequency of Display timing generator 60Hz Frame Frequency Either External Clock Input or Internal Oscillator Enabled - 38.4 - kHz FANN Backplane Frequency of Annunciator (Annun0-3, BP) 50% duty cycle Annunciator on, Fosc=38.4KHz -30 - Hz FFRM Frame Frequency Graphic Display Mode, Timing generator freq. = 38.4kHz Icon Mode, Timing generator freq. = 38.4kHz -60 TBD -Hz OSC Internal Oscillation Frequency with different value of feedback resistor Internal Oscillator Enabled, VDD within operation range See Figure 1 for the relationship |
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