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MC14060BCP Datenblatt(PDF) 5 Page - ON Semiconductor |
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MC14060BCP Datenblatt(HTML) 5 Page - ON Semiconductor |
5 / 10 page MC14060B http://onsemi.com 5 Figure 3. Oscillator Circuit Using RC Configuration 11 RESET RS Ctc Rtc 10OUT 1 9OUT 2 f [ 1 2.3 RtcCtc if 1 kHz ≤ f ≤ 100 kHz and 2Rtc < RS < 10Rtc (f in Hz, R in ohms, C in farads) The formula may vary for other frequencies. Recommended maximum value for the resistors in 1 M W. TYPICAL RC OSCILLATOR CHARACTERISTICS Figure 4. RC Oscillator Stability Figure 5. RC Oscillator Frequency as a Function of RTC and C − 8.0 −12 −16 − 4.0 0 4.0 8.0 125 100 75 50 25 0 −25 −55 TA, AMBIENT TEMPERATURE (°C) VDD = 15 V 1.0 V 5.0 V RTC = 56 kW C = 1000 pF RS =0, f=10.15kHz @ VDD =10, TA =25°C RS =120 kW, f=7.8kHz @ VDD =10V, TA =25°C 100 50 20 10 5 2 1 0.5 0.2 0.1 1.0 k 10 k 100 k 1.0 M RTC, RESISTANCE (OHMS) 0.0001 0.001 0.01 0.1 C, CAPACITANCE (mF) VDD = 10 V f AS A FUNCTION OF RTC (C = 1000 pF) (RS ≈ 2RTC) f AS A FUNCTION OF C (RTC = 56 kW) (RS = 120 k) Figure 6. Typical Crystal Oscillator Circuit CLOCK 11 RESET 9OUT 2 10OUT 1 18M RO CS CT Table 2. Typical Data for Crystal Oscillator Circuit Characteristic 500 kHz Circuit 32 kHz Circuit Unit Crystal Characteristics Resonant Frequency Equivalent Resistance, RS 500 1.0 32 6.2 kHz k W External Resistor/Capacitor Values RO CT CS 47 82 20 750 82 20 k W pF pF Frequency Stability Frequency Changes as a Function of VDD (TA = 25°C) VDD Change from 5.0 V to 10 V VDD Change from 10 V to 15 V Frequency Change as a Function of Temperature (VDD = 10 V) TA Change from − 55°C to +25 °C Complete Oscillator (Note 6) TA Change from + 25°C to + 125 °C Complete Oscillator (Note 6) +6.0 +2.0 +100 –160 +2.0 +2.0 +120 –560 ppm ppm ppm ppm 6. Complete oscillator includes crystal, capacitors, and resistors. |
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