Datasheet 74HCU04 (Nexperia) - 8

Nexperia 74HCU04 Hex unbuffered inverter Table 8. External components for resonator (f < 1 MHz)
All values given are typical and must be used as an initial set-up.
Frequency R1 R2 C1 C2
10 kHz to 15.9 kHz 22 MΩ 220 kΩ 56 pF 20 pF 16 kHz to 24.9 kHz 22 MΩ 220 kΩ 56 pF 10 pF 25 kHz to 54.9 kHz 22 MΩ 100 kΩ 56 pF 10 pF 55 kHz to 129.9 kHz 22 MΩ 100 kΩ 47 pF 5 pF 130 kHz to 199.9 kHz 22 MΩ 47 kΩ 47 pF 5 pF 200 kHz to 349.9 kHz 10 MΩ 47 kΩ 47 pF 5 pF 350 kHz to 600 kHz 10 MΩ 47 kΩ 47 pF 5 pF
Table 9. Optimum value for R2 Frequency R2 Optimum for
3 kHz 2.0 kΩ minimum required ICC 8.0 kΩ minimum influence due to change in VCC 6 kHz 1.0 kΩ minimum required ICC 4.7 kΩ minimum influence by VCC 10 kHz 0.5 kΩ minimum required ICC 2.0 kΩ minimum influence by VCC 14 kHz 0.5 kΩ minimum required ICC 1.0 kΩ minimum influence by VCC >14 kHz - replace R2 by C3 with a typical value of 35 pF 001aal930 80 input capacitance (1) (pF) 60 (2) (3) 40 (4) (5) 20 U04 U04 RS R C 0 0 2 4 6 8 001aah115 VI (V) (1) VCC = 2.0 V (2) VCC = 3.0 V (3) VCC = 4.0 V The average ICC (mA) is approximately (4) VCC = 5.0 V 3.5 + 0.05 × f (MHz) × C (pF) at VCC = 5.0 V. (5) VCC = 6.0 V Tamb = 25 °C.
Fig. 15. Astable multivibrator Fig. 16. Input capacitance as function of input voltage
74HCU04 All information provided in this document is subject to legal disclaimers. © Nexperia B.V. 2021. Al rights reserved
Product data sheet Rev. 9 — 31 May 2021 8 / 14
Document Outline 1. General description 2. Features and benefits 3. Ordering information 4. Functional diagram 5. Pinning information 5.1. Pinning 5.2. Pin description 6. Functional description 7. Limiting values 8. Recommended operating conditions 9. Static characteristics 10. Dynamic characteristics 10.1. Waveform and test circuit 11. Typical transfer characteristics 12. Application information 13. Package outline 14. Abbreviations 15. Revision history 16. Legal information Contents