Datasheet 74HC4060, 74HCT4060 (NXP) - 12

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Nexperia 74HC4060; 74HCT4060 14-stage binary ripple counter with oscillator 74HC4060
MR (from logic)
74HCT4060
11 RS RTC CTC 10 9 C2 R2 Rt Ct 001aai121 Typical formula for oscil ator frequency:
Fig. 12. Example of a RC oscillator
The recommended values for these components to maintain agreement with the typical oscillation formula are: Ct > 50 pF, up to any practical value and 10 kΩ < Rt < 1 MΩ. In order to avoid start-up problems, Rt ≥ 1 kΩ.
12.2. Typical crystal oscil ator circuit
In Fig. 13, R2 is the power limiting resistor. For starting and maintaining oscil ation a minimum transconductance is necessary, so R2 should not be too large. A practical value for R2 is 2.2 kΩ.
74HC4060
MR (from logic)
74HCT4060
11 RS Rbias RTC 560 kΩ 10 Rbias VDD 100 kΩ to 1MΩ 0.47 pF 100 µF R2 2.2 kΩ VI input output (f A i = 1 kHz) IO GND C3 C2 22 pF to 37 pF 100 pF 001aai123 gfs = ΔIO / ΔVI at VO is constant; MR = LOW. 001aai122 See also Fig. 15.
Fig. 13. External component connection for a crystal Fig. 14. Test set-up for measuring forward oscillator transconductance
74HC_HCT4060 All information provided in this document is subject to legal disclaimers. © Nexperia B.V. 2020. Al rights reserved
Product data sheet Rev. 5 — 8 May 2020 12 / 20
Document Outline 1. General description 2. Features and benefits 3. Applications 4. Ordering information 5. Functional diagram 6. Pinning information 6.1. Pinning 6.2. Pin description 7. Functional description 8. Limiting values 9. Recommended operating conditions 10. Static characteristics 11. Dynamic characteristics 11.1. Waveforms and test circuit 12. RC oscillator 12.1. Timing component limitations 12.2. Typical crystal oscillator circuit 13. Package outline 14. Abbreviations 15. Revision history 16. Legal information Contents